Quantum Sensing &amp; Metrology: Atomic Clocks &amp; Quantum Sensors

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Infleqtion Helps Launch Japan’s First Operational Neutral-Atom Quantum Computer

Insider Brief Press release – Infleqtion (NYSE: INFQ), a global leader in quantum computing and quantum sensing powered by neutral-atom technology, has helped Japan reach a major quantum milestone, supporting a research team led by Professor Kenji Ohmori at the Institute for Molecular Science (IMS), part of the National Institutes of Natural Sciences, in launching the […]

Infleqtion Collaboration with Japan Moonshot Program Achieves Major Milestone: “Shunkai” Neutral Atom Quantum Computer Now Operational

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Infleqtion Collaboration with Japan Moonshot Program Achieves Major Milestone: “Shunkai” Neutral Atom Quantum Computer Now Operational

Infleqtion’s quantum processing unit advances Japan’s first operational full-stack neutral-atom quantum computer, reinforcing momentum toward scalable quantum systems. LOUISVILLE, Colo. | August 24, 2026 | Infleqtion (NYSE: INFQ), a global leader in quantum computing and quantum sensing powered by neutral-atom technology, has helped Japan reach a major quantum milestone, supporting a research team led by Professor Kenji Ohmori at the Institute for Molecular Science (IMS), part of the National Institutes of Natural Sciences, in launching the country’s first operational neutral-atom full-stack quantum computer. Infleqtion was also the only foreign quantum partner selected by the Japan Science and Technology Agency (JST) for its Quantum Moonshot program. Infleqtion contributed its quantum processing unit to the program, in collaboration with the Ohmori group at IMS, as one of the principal investigators of the Moonshot project led by Professor Ohmori, supporting the transition from research and development to an operational full-stack quantum computing platform. The system, referred to as “Shunkai”, is initially expected to operate with approximately 50 qubits, with plans to scale to around 500 qubits as development progresses. “This milestone marks a pivotal moment for Japan’s quantum ambitions as well as Infleqtion’s role in advancing production-ready quantum platforms at scale,” said Pranav Gokhale, Chief Technology Officer at Infleqtion. “Bringing a full-stack quantum system into production operation is a meaningful step toward fault-tolerant quantum computing that also serves as strong validation of neutral-atom architecture. Our quantum processing unit delivers the programmability, scalability and fidelity control that next-generation systems demand.” As part of the next phase of the Ohmori Moonshot project that has just started in April 2026, the IMS team will focus on improving system integration, stability, and scalability, with the goal of realizing a high-pe

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Collective Quantum Logic Spectroscopy

--> Quantum Physics arXiv:2608.20471 (quant-ph) [Submitted on 20 Aug 2026] Title:Collective Quantum Logic Spectroscopy Authors:Raphael Kaubruegger, Matthew Patkowski, Yicheng Zhang, Robert J. Lewis-Swan, David B. Hume, Ana Maria Rey View a PDF of the paper titled Collective Quantum Logic Spectroscopy, by Raphael Kaubruegger and Matthew Patkowski and Yicheng Zhang and Robert J. Lewis-Swan and David B. Hume and Ana Maria Rey View PDF HTML (experimental) Abstract:Scaling trapped-ion quantum sensors from single ions to large ensembles is a key challenge for next-generation precision measurements. At the same time, many ion species of interest for optical clocks and tests of fundamental physics lack closed cycling transitions required for direct laser cooling and state detection. Collective quantum logic spectroscopy addresses both limitations by coupling an ensemble of sensor, or spectroscopy, ions to one or more logic ions that provide sympathetic cooling and state readout. Here, we establish the fundamental performance limits and operating regimes of this protocol, identifying how the interaction strength, interrogation time, and logic-ensemble size govern sensitivity, dynamic range, and robustness to experimental imperfections. We show that quantum-limited sensitivity can be retained even with a single logic ion, while increasing the number of logic ions substantially improves readout efficiency and robustness. Beyond precision metrology, the same collective interface enables many-body measurements relevant to quantum information processing, including parity measurements and stabilizer-like syndrome extraction. Our results establish collective quantum logic spectroscopy as a scalable framework for optical clocks, quantum-enhanced sensing, and trapped-ion quantum information processing. Subjects: Quantum Physics (quant-ph); Atomic Physics (physics.atom-ph) Cite as: arXiv:2608.20471 [quant-ph]   (or arXiv:2608.20471v1 [quant-ph] for this version)   https://do

Hybrid dynamical decoupling and coherent driving for high-fidelity nuclear-spin control in diamond

--> Quantum Physics arXiv:2608.20742 (quant-ph) [Submitted on 21 Aug 2026] Title:Hybrid dynamical decoupling and coherent driving for high-fidelity nuclear-spin control in diamond Authors:Jiwon Jeon, Donghun Jung, Eunsang Lee, Junghyun Lee View a PDF of the paper titled Hybrid dynamical decoupling and coherent driving for high-fidelity nuclear-spin control in diamond, by Jiwon Jeon and 3 other authors View PDF Abstract:Nitrogen-vacancy (NV) centers in diamond provide room-temperature electron-nuclear spin registers for quantum sensing and quantum information processing, with surrounding 13C nuclear spins serving as long-lived quantum memories. However, coherent control of large nuclear-spin registers is limited by finite electron-spin coherence and spectral addressability. Existing approaches follow two complementary strategies: dynamical-decoupling (DD) gates exploit filter-function resonances to realize selective conditional evolution but permit only discrete rotation angles, whereas dynamical-decoupling radio-frequency (DDrf) control restores continuous tunability at the cost of stringent hyperfine-geometry and RF-power requirements. Here, we introduce hybrid dynamical-decoupling and radio-frequency (H-DDrf) control, which preserves the DD-induced conditional evolution and employs a geometrically phase-matched RF drive to complete the target operation. This approach reduces both RF power and gate duration while maintaining high-fidelity control, thereby expanding the accessible 13C nuclear-spin register for room-temperature NV-based quantum memories and quantum processors. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2608.20742 [quant-ph]   (or arXiv:2608.20742v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.20742 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Jiwon Jeon [view email] [v1] Fri, 21 Aug 2026 05:02:26 UTC (15,779 KB) Full-text links: Access Paper: View

Coherence-Based Identification of Carbon-Based Spin Qubits in Hexagonal Boron Nitride from First Principles

--> Quantum Physics arXiv:2608.20833 (quant-ph) [Submitted on 21 Aug 2026] Title:Coherence-Based Identification of Carbon-Based Spin Qubits in Hexagonal Boron Nitride from First Principles Authors:Hyeonsu Kim, Jaewook Lee, Huijin Park, Hosung Seo View a PDF of the paper titled Coherence-Based Identification of Carbon-Based Spin Qubits in Hexagonal Boron Nitride from First Principles, by Hyeonsu Kim and 3 other authors View PDF Abstract:Carbon-related defects in hexagonal boron nitride are promising room-temperature single-spin qubits and quantum sensors, but their atomic structures remain largely unidentified. Here we show, using first-principles calculations of electron-spin decoherence, that the atomic structure of each defect is imprinted in its spin coherence. Mapping the Hahn-echo dynamics of seven candidate carbon defects across magnetic field and four isotope-engineered nuclear-spin baths, we find that electron-spin-echo envelope modulation emerges at defect-specific magnetic fields, at which the nearest-neighbor nuclear spins satisfy a cancellation condition set by their hyperfine and quadrupole couplings. Both the fields and the modulation frequencies follow from an analytical model using computed hyperfine and quadrupole tensors alone, and they shift or vanish upon isotope substitution. At low fields, the field dependence of the coherence time separates the defects into two classes according to the sublattice occupied by carbon. These decoherence fingerprints, directly testable in isotope-engineered samples, establish a structural identification route complementary to optical spectroscopy. Comments: Subjects: Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Cite as: arXiv:2608.20833 [quant-ph]   (or arXiv:2608.20833v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.20833 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Hyeonsu Kim [view email] [v1]

Protocol balances accuracy and privacy in quantum sensing networks

Researchers at the Technical University of Denmark and Sorbonne Université have introduced and analysed a protocol for distributed quantum sensing that estimates an average phase with precision increasing alongside the total photon number, exhibiting Heisenberg scaling. The work answers the question of whether a network can estimate a global parameter while protecting locally encoded values, with each node encoding a local phase into a shared entangled Gaussian state. Complete privacy is unattainable for finite squeezing in multi-party settings, but it emerges in the large-squeezing limit. The team further investigated the impact of displacements and optical losses, revealing trade-offs between estimation accuracy and privacy. Continuous-Variable Network Enables Distributed Quantum Sensing A network of quantum sensors can now estimate a global parameter while simultaneously shielding locally encoded information, a feat demonstrated through a new continuous-variable protocol. The network’s architecture is central to this advancement; each node encodes information about a local phase rather than measuring any parameter. This localized encoding, combined with the shared entangled state, allows for global estimation without revealing individual node data. The team’s analysis of the quantum Fisher information matrix (QFIm) reveals a critical distinction between two-mode and multi-mode settings, establishing that a two-mode squeezed state remains completely private, but local knowledge of a party’s phase constitutes a break in privacy, even with finite squeezing and optical loss. Although complete privacy, where all other combinations of phases remain entirely hidden, is unattainable for finite squeezing in multi-party settings, it emerges in the large-squeezing limit. The researchers quantified privacy using a measure, P(Q,v), introduced in a prior reference, and found that while individual phases are inaccessible, complete privacy is unattainable for finite squeezing in

Parity measurements help build better quantum light sources

Researchers from East China Normal University and New York University Shanghai have developed a new protocol for preparing specialized quantum states crucial for advancing quantum technologies. The work demonstrates the generation of squeezed states, achieving approximately 9 decibels of quantum noise reduction after three parity measurements, with potential for even greater noise reduction as the number of measurements increases. This technique extends beyond squeezed states to also prepare cat and Gottesman-Kitaev-Preskill states, and the authors state the scheme is universal, allowing for the preparation of an arbitrary state. Bosonic modes utilized in this process provide long-lived degrees of freedom for quantum information storage and processing. Dispersive Measurements & Displacements: The PANDA Algorithm This work introduces the Parity/Number basis measurement Displacement Algorithm, or PANDA, a technique leveraging dispersive measurements and displacements to engineer a variety of bosonic quantum states. The PANDA algorithm’s core innovation lies in its ability to generate not only squeezed states, but also more complex states like cat and Gottesman-Kitaev-Preskill (GKP) states. These states are critical components in areas like quantum metrology and quantum communication, offering potential improvements in precision measurement and secure data transmission. The protocol hinges on the principle that a squeezed vacuum state resides exclusively within the even-parity subspace of the Fock basis, a characteristic exploited through a sequence of displaced parity measurements. By strategically applying these measurements along the anti-squeezed quadrature, the algorithm effectively isolates and prepares the desired quantum state. The team analyzed the performance of this scheme by quantifying the achievable squeezing and assessing the impact of realistic imperfections, demonstrating the robustness of the protocol. PANDA circumvents the limitation of requiring

Infleqtion (INFQ) and the Neutral-Atom Bet Behind Its NYSE Listing

Infleqtion builds quantum computers and quantum sensors out of neutral atoms, from a headquarters in Louisville, Colorado. In February 2026 it became, on its own account, the first neutral-atom specialist to trade on a major public exchange. It was founded in Boulder in 2007 as ColdQuanta by the University of Colorado physicist Dana Anderson. It then spent nearly two decades turning laboratory cold-atom physics into hardware it could ship, before listing on the New York Stock Exchange under the ticker INFQ and becoming a quantum stock overnight. The interesting question is not whether the listing happened. It is whether a business selling clocks and radio receivers today can fund a quantum computer for the 2030s. Key takeaways 1. A neutral-atom quantum company. Infleqtion builds quantum computers, precision sensors and software around neutral atoms. The company argues that this is the most scalable and economical path to commercial quantum systems. One platform, three product lines. 2. Boulder roots, founded in 2007 as ColdQuanta. The business was incorporated in Colorado on 7 February 2007 by the University of Colorado physicist Dana Anderson. It took the Infleqtion brand in November 2022, to mark the shift from research work toward selling finished products commercially. Anderson is still chief science officer. The legal entity kept the ColdQuanta name right up to the merger that took the company public. 3. The first public neutral-atom stock. The company trades on the New York Stock Exchange under the ticker INFQ after a February 2026 merger. The company says that makes it the first listed business dedicated to neutral-atom quantum technology, and the shares started trading on 17 February 2026. 4. Computing and sensing under one roof. Unlike most quantum firms, the company sells both quantum computers and a line of quantum sensors, including atomic clocks and radio-frequency receivers. A cross-vendor software stack rounds out the portfolio. 5. A staged logical-qu

Michigan Team Shapes Resonator Spectra with Dual Interference

P. K. Rath from the Indian Association for the Cultivation of Science and colleagues report a new method for shaping the spectral response of gigahertz-frequency surface acoustic wave resonators by simultaneously introducing both electromagnetic and acoustic Fano interference. Systematic modification of resonator acoustic reflectivity allowed isolation and analysis of each interference mechanism independently. The broad operating temperature range, from ambient to cryogenic temperatures, highlights potential applications in both classical and quantum sensing. Surface acoustic waves (SAWs) represent mechanical oscillations travelling along a crystal’s surface, localised approximately one wavelength above and below it. These waves are generated on piezoelectric crystals via time-varying electric fields applied to metallic transducers converting electrical signals into mechanical waves. Owing to their strain and piezoelectric coupling, SAWs provide a flexible platform for controlling and probing many condensed-matter systems. SAW techniques have been widely used to probe frequency-dependent conductivity in low-dimensional many-body quantum matter and create tunable acoustic lattices for manipulating collective states. They enable coherent transport of individual charges, spins, and single photon generation. Integration with two-dimensional electronic systems has investigated high-frequency acoustically driven transport and band structure engineering. Beyond condensed matter physics, SAW devices operating in the MHz to GHz range are ubiquitous in RF and microwave signal processing functioning as filters, delay lines, and resonators. Moreover, since SAWs propagate on substrate surfaces they exhibit key sensitivity to minute perturbations due to external factors such as pressure and temperature. Simultaneous electromagnetic and acoustic Fano interference boosts resonator sensitivity six-fold A six-fold enhancement in sensitivity was achieved by simultaneously introducing

Researchers Map Light, Matter Interaction at Intermediate Regimes

Understanding resonant cavity, quantum system interactions was previously limited to pulsed or continuous-wave scenarios, with the intermediate regime largely unexplored. Mio Poortvliet from Leiden University and CNRS, and colleagues have achieved the first thorough modelling of dynamics where pulse duration matches cavity splitting and detunings, spanning energy scales of approximately 1 to 10GHz. The team modelled how light interacts with quantum dots within resonant cavities, tiny structures that can emit single photons, particles of light, with specific properties. Their new modelling approach explores an intermediate state between short bursts and continuous beams of light used to excite these systems. The work reveals how carefully designed cavities, specifically those splitting polarized light, can optimise photon quality and increase emission rates. Mio Poortvliet and colleagues and CNRS developed new modelling to explore this interaction; resonant cavities are essentially an echo chamber for light, amplifying specific colours or wavelengths. This intermediate regime bridges established understandings of short bursts versus continuous beams. It reveals that carefully engineered cavities can optimise photon quality and boost emission rates via the Purcell effect, similar to amplifying a singer’s voice on stage. These findings detail parameter regimes for maximising both photon extraction and purity but raise questions about how best to control these complex interactions. Further technical details regarding their quantum master-equation model are presented below. Resonant cavity optimisation yields tenfold increase in single-photon source purity Single-photon purity increased by over an order of magnitude, exceeding ten percent where previously it was limited to approximately one percent. This advance resulted from detailed modelling of light interaction with quantum dots within resonant cavities, spanning energy scales between 1 and 10GHz where neither pulsed

Researchers Map Dark Matter Interactions Using Quantum Dot Barcodes

Calculations detail how dark matter scatters on electrons within quantum dots, tiny semiconductor nanocrystals, creating a “barcode” effect. The barcode arises from variations in the shape of these quantum dots, encoding information about the mass and properties of interacting dark matter particles. The team considered experimental designs utilising one kilogram of this quantum dot material per section of the proposed detector to quantify their findings. The interaction of dark matter within quantum dots has been calculated; these are incredibly small semiconductor crystals used in displays and other technologies. This approach allows not only detection but also characterisation of fundamental dark matter qualities by analysing subtle differences across many uniquely shaped crystals. A new approach uses quantum dots, nanoscale semiconductor crystals akin to differently sculpted clay models, each possessing unique forms, for detecting dark matter. These tiny structures offer advantages over traditional detectors by potentially lowering energy thresholds needed to register interactions, a key feature as many theoretical dark matter candidates possess very low masses. Calculations were performed based solely on first principles, building up understanding from basic components without relying on pre-made assumptions, to determine how dark matter scatters within these materials and creates the “barcode” effect dependent upon crystal shape. This barcode encodes information about the mass and properties of interacting dark matter particles, allowing detection and characterisation of its fundamental qualities. Predicting dark matter interactions via first-principles simulations of confined electrons An ab initio calculation was central to this work, building up understanding from basic components without pre-made assumptions. It enabled prediction of interactions between dark matter and electrons within quantum dots free from prior biases or empirical data. Solving complex

Researchers Simulate 2D Quantum States Using Monitored Circuits

For the first time, monitored quantum circuits evaluate two-dimensional quantum states without computationally expensive tensor network contraction. The method utilises variational projected entangled pair states with isometric constraints, effectively mapping complex calculations onto readily accessible circuit sampling techniques. Implementing this requires O(W log2 D) qubits, where W represents cylinder circumference and D is the virtual bond dimension. A new computational method models complex quantum materials using both standard computers and emerging quantum processors. By translating mathematical descriptions into patterns suitable for quantum circuits, the team overcame limitations previously hindering such simulations; this approach replaces difficult calculations with more manageable sampling techniques. This enables investigation of two-dimensional systems, those behaving differently in each direction, that were formerly too complicated to study effectively, potentially accelerating progress within condensed matter physics. The technique simulates complex quantum materials by sidestepping traditional computational bottlenecks. It uses blueprints describing how particles connect within a material, known as Projected Entangled Pair States or PEPS. These ‘blueprints’ previously required immense processing power to simplify due to calculating every interaction between components, similar to meticulously accounting for each brick in an elaborate architectural design. Instead, the calculations are mapped onto quantum circuits and use sampling techniques, reducing demand on both conventional computers and emerging quantum processors. This approach models two-dimensional systems, those behaving differently depending on direction, using approximately O(W log2 D) qubits where W represents cylinder circumference and D is virtual bond dimension; it also utilises conveyor belts moving properties around a simulated area, called a transfer matrix, to describe informati

Researchers Build Adaptive Quantum Sensor Designs with Reinforcement Learning

A new set of tools called AUTOQSENSE addresses challenges in high-precision parameter estimation where performance is key to quantum circuit architecture during probe preparation and measurement periods. The method optimises continuous parameters within pre-defined ansatzes, restricting the explored design space and hindering adaptability to specific sensing tasks and hardware constraints periods. Jie Liu and Xin Wang at the University of Science and Technology of China present a reinforcement-learning framework designed to search for optimal circuit architectures using Fisher-information-based objectives periods. In few-qubit systems, an agent sequentially constructs both preparation and measurement circuits periods. For larger systems, a distributed formulation assigns local circuit design responsibilities to subsystem agents and establishes inter-block communication protocols periods. Automated circuit design enhances parameter estimation with reduced gate complexity Entangling gate counts decreased by up to 30% compared to established hardware-efficient approaches while maintaining precise parameter estimation periods. This improvement unlocks previously unattainable sensing protocols due to resource limitations. Conventional methods struggle when faced with complex noise models or large numbers of qubits requiring extensive optimisation periods. textsc{AutoQSense}, a new framework from David Hayes and his team alongside collaborators Quantum AI, automatically designs optimal circuits for quantum sensors using reinforcement learning, a technique where an agent learns through trial and error, and Fisher information, which measures data gained from each measurement period. The system successfully rediscovers known strategies whilst adapting effectively to dephasing noise, a common source of errors in quantum systems, demonstrating its flexible application across diverse scenarios periods. Achieving superior results on simulations involving up to four qubits was ve

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A strange new quantum droplet can hold itself together

Science News from research organizations A strange new quantum droplet can hold itself together Date: August 21, 2026 Source: Monash University Summary: Two very different types of quantum particles may be able to form stable droplets that hold themselves together, challenging decades of conventional thinking. The prediction could soon be tested experimentally and may reveal an unexpectedly rich world of new quantum phases. Share: Facebook Twitter Pinterest LinkedIN Email FULL STORY A schematic of the Bose-Fermi droplet, which demonstrates the unique phase researchers observe in their theory. Credit: Monash University Researchers at Monash University have predicted an unusual new form of quantum matter that could overturn long-held assumptions about how ultracold particles behave. Their calculations suggest that, under the right conditions, two fundamentally different classes of quantum particles -- bosons and fermions -- can combine to create stable, self-bound "quantum droplets." Scientists had previously considered such droplets unlikely to form in strongly interacting Bose-Fermi systems. The findings offer researchers a new theoretical framework for future experiments and could improve scientists' understanding of quantum materials relevant to emerging technologies, including ultra-precise sensors and quantum computing. A Quantum Droplet That Holds Itself Together Lead author and Monash PhD candidate Sam Foster from the School of Physics and Astronomy said the results create opportunities to investigate entirely new quantum states. "Quantum systems can behave in ways that seem impossible in our everyday world. We've shown that these two very different types of particles can balance each other perfectly to create a stable droplet that effectively holds itself together." These quantum droplets are fundamentally different from ordinary drops of liquid. Their stability comes from the unusual laws of quantum mechanics. An attractive force pulling the particles togeth

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Antidots measure anyonic charge in graphene

Anyons are fractionally charged quasiparticles of the quantum Hall effect, and could one day power topological quantum computers. Trapping and measuring anyons remains difficult, but quasiparticle charges have now been measured using a gate-defined antidot in bilayer graphene. For hole-conjugate states, the parity of downstream integer edge modes sets the observed charge. This is a preview of subscription content, access via your institution Access options Access through your institution Access Nature and 54 other Nature Portfolio journals Get Nature+, our best-value online-access subscription $32.99 / 30 days cancel any time Learn more Subscribe to this journal Receive 12 print issues and online access $259.00 per year only $21.58 per issue Learn more Buy this articlePurchase on SpringerLinkInstant access to the full article PDF.USD 39.95Prices may be subject to local taxes which are calculated during checkout Fig. 1: Antidot device and measurement of fractional charge. Subjects Electronic properties and materials Quantum Hall ReferencesNayak, C., Simon, S. H., Stern, A., Freedman, M. & Das Sarma, S. Non-Abelian anyons and topological quantum computations. Rev. Mod. Phys. 80, 1083–1159 (2008). A review article about non-Abelian anyons and how braiding them could realize fault-tolerant topological quantum computation.Article  ADS  MathSciNet  Google Scholar  Glattli, D. C. Quantum shot noise of conductors and general noise measurement methods. Eur. Phys. J. Spec. Top. 172, 163–179 (2009). This review article covers experimental techniques for measuring current fluctuations, including methods for fractional charge detection.Article  Google Scholar  Dean, C., Kim, P., Li, J. I. A. & Young, A. in Fractional Quantum Hall Effects: New Developments (eds Halperin, B. I & Jain, J. K.) 317–375 (World Scientific, 2020). This book chapter reviews progress in understanding the fractional quantum Hall effects in graphene.Sim, H

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Dirac Labs Raises $1.8M for Quantum Navigation Sensors

Insider Brief Press release – Dirac Labs, a quantum-enabled navigation company, today announced its $1.8M pre-seed funding to prototype its quantum sensors and conduct field trials to further refine its technology to provide universal positioning where GPS is unavailable. Quantum sensing offers a resilient, alternative method of positioning by measuring features of Earth’s magnetic field, […]

Polarization entanglement restored in solid-state photon sources

Ismail Nassar, Dan Cogan, and Ido Schwartz of the Technion-Israel Institute of Technology have demonstrated a method to restore polarization entanglement in photons emitted from a semiconductor quantum dot. The researchers applied synchronized, time-dependent operations directly to emitted photons, reversing accumulated phase shifts caused by internal dynamics within the quantum dot itself. This photonic-compensation protocol recovers entanglement without needing to filter data based on emission time or relying on precise detector timing. The work establishes a strategy for removing the impact of emitter dynamics on photonic entanglement. Using exciton fine-structure splitting of 8.80 ± 0.04 microelectronvolts in a semiconductor quantum dot as a model system, they implemented dynamic phase modulation and performed time-resolved two-photon polarization tomography. They show that this restores a stationary two-photon polarization state and recovers polarization entanglement without temporal post-selection and independently of detector timing resolution. Photonic-Compensation Reverses Phase Evolution in Quantum Dots Quantum dots offer a promising pathway to scalable entangled-photon sources, yet inherent properties of these semiconductor structures often degrade the quality of emitted entanglement. Specifically, exciton fine-structure splitting within the quantum dot introduces a deterministic, time-dependent phase shift on emitted photons, effectively scrambling the entanglement when averaged over stochastic emission times and limited detector resolution. This approach centers on applying synchronized, time-dependent coherent operations to emitted photons, reversing the accumulated phase shift regardless of when the photon was released from the quantum dot. The team utilized a semiconductor quantum dot as a model system, leveraging its exciton fine-structure splitting to induce a predictable phase evolution, then actively counteracted this evolution with dynamic phase

Observable Scaling Hierarchies in Multiphoton Dissipative Quantum Sensing

--> Quantum Physics arXiv:2608.18157 (quant-ph) [Submitted on 13 Aug 2026] Title:Observable Scaling Hierarchies in Multiphoton Dissipative Quantum Sensing Authors:Shahram Panahiyan View a PDF of the paper titled Observable Scaling Hierarchies in Multiphoton Dissipative Quantum Sensing, by Shahram Panahiyan View PDF HTML (experimental) Abstract:We investigate how quantum correlations in squeezed driving fields determine scaling laws in dissipative multiphoton quantum sensing. Independently squeezed fields yield \emph{factorized} scaling, with separate absorption and emission contributions and nonlinear thresholds that suppress exponential scaling in linear processes. In contrast, jointly squeezed fields generate \emph{collective} scaling governed by the total nonlinear photon order of the dissipative interaction. Remarkably, we show that normally ordered observables do not inherit the full nonlinear scaling of the underlying multiphoton fluctuations. Instead, they exhibit asymptotic behavior with an effective nonlinear order reduced by one. This arises because normally ordered observables probe only part of the underlying multiphoton fluctuation structure. These findings reveal how multiphoton fluctuations, quantum correlations, and measurement structure jointly determine the experimentally accessible sensitivity of nonlinear dissipative quantum sensors and establish design principles for quantum sensing protocols based on structured squeezed light. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2608.18157 [quant-ph]   (or arXiv:2608.18157v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.18157 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Shahram Panahiyan [view email] [v1] Thu, 13 Aug 2026 18:52:31 UTC (7,025 KB) Full-text links: Access Paper: View a PDF of the paper titled Observable Scaling Hierarchies in Multiphoton Dissipative Quantum Sensing, by Shahram PanahiyanVie

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Diraq Establishes First US Quantum Laboratory at Chicago’s IQMP On-Ramp Hub

Diraq Establishes First US Quantum Laboratory at Chicago’s IQMP On-Ramp Hub Silicon spin-qubit hardware developer Diraq has opened its first U.S. research and measurement laboratory in Chicago, Illinois. Situated within the Illinois Quantum and Microelectronics Park (IQMP) On-Ramp program hosted at innovation center mHUB, the facility expands Diraq’s global R&D footprint beyond its headquarters in Sydney, Australia, to accelerate its roadmap toward utility-scale silicon quantum processors. [ Diraq Global R&D & Fabrication Architecture ] │ ┌──────────────────────────────────┴──────────────────────────────────┐ ▼ ▼ Sydney HQ & Device Fabrication Chicago IQMP Laboratory Hub • Silicon Spin-Qubit QPU Design. • 2 Dedicated Cryogenic Dilution Refrig. • CMOS-Compatible Semiconductor Fabs. • Cryo-CMOS & Control Component Testing. • Primary Fabrication & Theory Teams. • Continuous 24-Hour Cross-Time-Zone R&D. On-Site Cryogenic Capabilities and Global Operations The Chicago facility provides Diraq’s U.S. engineering team with dedicated cryogenic measurement infrastructure—including two dilution refrigerators—to test, characterize, and validate silicon spin-qubit chips and integrated cryogenic CMOS (cryo-CMOS) control electronics: 24-Hour Experimental Workflow: Operating across complementary time zones between Sydney and Chicago, Diraq executes continuous 24-hour experimental measurement cycles, accelerating device iteration and qubit characterization. IQMP Ecosystem Integration: Supported by IQMP and the Illinois Economic Development Corporation (IEDC), the On-Ramp program provides immediate laboratory access while the permanent 128-acre IQMP campus undergoes construction on Chicago’s South Side. Silicon CMOS Scaling Roadmap: Diraq’s architecture utilizes electron spin qubits in quantum dots fabricated with standard silicon CMOS semiconductor processes. This approach targets rack-scale quantum systems containing thousands of physical qubits by 2029,

Infleqtion will map Colorado minerals with quantum sensors by 2027

By 2027, Infleqtion plans a field demonstration in Colorado to map underground mineral deposits using quantum gravity gradiometry, a technology aimed at reducing the costs and uncertainties of current exploration methods, the company says. The company’s work supports the Quantum-Enhanced Critical Minerals Mapping Act of 2026, which would direct the U.S. Geological Survey to integrate this quantum sensing into its Earth Mapping Resources Initiative. “America cannot secure the supply chains it cannot see,” says Matt Kinsella, CEO of Infleqtion, emphasizing the need to identify domestic resources for national security and advanced manufacturing. Quantum Gravity Gradiometry for Critical Mineral Mapping Infleqtion plans to deploy quantum gravity gradiometry technology in Colorado by 2027, aiming to significantly reduce the costs associated with critical mineral exploration. Current methods rely heavily on drilling, a process that is both expensive and environmentally disruptive; quantum gravity gradiometry offers a non-invasive alternative for initial subsurface mapping. This technology measures minute variations in Earth’s gravitational field, revealing differences in underground density and geological structure that are often undetectable through conventional surface surveys. Matt Kinsella, CEO of Infleqtion, testified before the House Committee on Natural Resources in July, advocating for this integration and emphasizing the strategic importance of domestic mineral resources. Infleqtion is currently evaluating potential field-test locations within Colorado’s Third Congressional District, with the goal of identifying promising geological structures before committing to drilling. Congressman Jeff Hurd championed the legislation, stating, “America should not have to rely on foreign countries for the critical minerals we need for our economy and national security.” The potential of quantum gravity gradiometry lies in its ability to narrow search areas, allowing exploratio