Quantum Computing Thematic Hub
Indian Institute of Science (IISc)
The Quantum Computing Thematic Hub at IISc Bangalore is developing India's first indigenous quantum computers using superconducting and photonic qubit technologies. The hub aims to build 50-1000 physical qubit systems by 2031, establishing India as a global player in quantum computing.
Research Focus
Key Objectives
- •Develop superconducting qubit processors with >99% gate fidelity
- •Build photonic quantum computing platforms
- •Create quantum software stack and algorithms
- •Establish quantum computing cloud infrastructure
- •Train 500+ quantum computing professionals
Key Research Areas
Superconducting Qubits
Development of cryogenic superconducting circuits for quantum computation
Photonic Quantum Computing
Room-temperature quantum processors using photon-based qubits
Quantum Software
Algorithms, compilers, and development tools for quantum applications
Key Achievements
Infrastructure & Facilities
Latest News & Updates
View All Quantum Computing Thematic Hub News
quantum-computingAI Model Boosts Molecular Property Prediction Accuracy
Scientists are increasingly focused on developing accurate and efficient interatomic potentials to model atomic properties in both organic and inorganic compounds. G. Laskaris, D. Morozov, and colleagues from the Indian Institute of Science, in collaboration with D. Tarpanov, A. Seth, J. Procelewska, G. Sai Gautam, A. Sagingalieva, R. Brasher, and A. Melnikov, have addressed the inherent trade-off between prediction accuracy and computational cost in machine learning interatomic potentials. Their research details a multi-objective optimisation approach applied to the Allegro model, alongside experiments with novel hybrid architectures incorporating both classical and quantum-inspired layers. By benchmarking these variants against established datasets, QM9, rMD17-aspirin, rMD17-benzene, and a proprietary copper-lithium dataset, the team demonstrates significant improvements in accuracy for certain models, while also quantifying the associated impact on inference times, offering a pathway towards more practical and powerful materials modelling. By predicting how atoms bond is like building with Lego, get the connections wrong and the structure falls apart. To develop accurate computer models of these interactions. But which also run quickly, has long been a challenge for materials science. This effort presents a new approach to designing these models, balancing precision with computational speed for both organic and inorganic materials. Scientists are increasingly reliant on machine learning interatomic potentials (MLIPs) to model molecular systems, offering a pathway to accelerate computational time and reduce the complexity of energy calculations when compared to traditional density functional theory (DFT). This approach seeks to balance predictive power with the time required for calculations, a trade-off inherent in many MLIP designs. The pursuit of higher accuracy is not without cost, as these advancements are accompanied by variations in inference times. Here, t
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quantum-computingWhat Rigetti Computing (RGTI)'s $8.4 Million India Quantum Order Means For Shareholders - Yahoo Finance
What Rigetti Computing (RGTI)'s $8.4 Million India Quantum Order Means For Shareholders Simply Wall St February 23, 2026 3 min read RGTI -0.29% Rigetti Computing previously announced an US$8.4 million order from India’s Centre for Development of Advanced Computing to deliver a 108-qubit quantum computer in Bengaluru, alongside plans to commercially launch its modular Cepheus-1-108Q system by late first quarter 2026. This contract underscores growing international demand for Rigetti’s on-premises quantum hardware and offers an early test of the company’s ability to scale complex systems for real-world research use. We’ll now examine how this Indian 108-qubit system order could influence Rigetti’s investment narrative around system sales and long-term adoption. Capitalize on the AI infrastructure supercycle with our selection of the 34 best 'picks and shovels' of the AI gold rush converting record-breaking demand into massive cash flow. Rigetti Computing Investment Narrative Recap To own Rigetti shares, you need to believe that its chiplet based superconducting roadmap can translate cutting edge hardware into paying system customers before cash burn and execution risk dominate the story. The US$8.4 million C DAC order in India supports that thesis by validating on premises system demand, but it does not change the near term reality of small revenue, high operating losses and reliance on a few large contracts as the key risk and catalyst. The Indian 108 qubit system ties directly into Rigetti’s Cepheus 1 108Q roadmap, which targets commercial launch by late first quarter 2026. That timing sits alongside other catalysts such as the three year US$5.8 million AFRL networking contract and growing Novera deployments, which together could start to shift the mix from mainly research style work toward more recurring system sales and usage based revenue. Yet against the excitement around India’s order, investors should also be aware that...
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quantum-computingNonlocality Achieved Without Quantum Entanglement
Researchers are investigating the fundamental limits of distinguishing between quantum states, a problem with implications for quantum communication and computation. Satyaki Manna from the Department of Physics, Indian Institute of Technology Bhubaneswar, and Anandamay Das Bhowmik from the School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram, alongside their colleagues, demonstrate a surprising disconnect between the ability to globally identify states and the constraints imposed by local operations with classical communication. Their work reveals that it is possible to achieve nonlocality, a hallmark of quantum mechanics, without requiring quantum entanglement, a concept previously thought to be essential. Specifically, the team proves that three bipartite product states can be globally distinguished yet remain indistinguishable through local operations, establishing three as the minimum number of states needed to observe this phenomenon and extending it to higher-order scenarios, including genuinely non-local tripartite states. Researchers have demonstrated a surprising connection between how information is shared and the fundamental laws governing quantum systems. This work reveals that it is possible to discern between quantum states without relying on the entangled particles previously thought necessary, challenging conventional understanding and opening new avenues for exploring the boundaries of quantum mechanics. This research uncovered a disconnect between how quantum states appear locally and globally, revealing that a minimum of three quantum states is sufficient to demonstrate nonlocality without entanglement. This finding challenges conventional understanding of quantum information processing and opens new avenues for exploring the fundamental limits of measurement. While quantum entanglement is often considered a prerequisite for nonlocality, the ability of quantum systems to exhibit correlations stronger than those
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researchPerovskite Crystals Reveal Distinct Light-Matter Interactions
Scientists are increasingly focused on understanding exciton-phonon interactions within lead halide perovskites, crucial for optimising their optoelectronic properties. Pradeepa H. L., Sagnik Chatterjee, and Sayantan Patra, working with colleagues from the Department of Physics at the Indian Institute of Science Education and Research (IISER), Pune, and Hardeep and Akshay Singh from the Department of Physics at the Indian Institute of Science, Bangalore, report detailed spectroscopic analysis of CsPbBr3 microcrystals. Their collaborative research, also involving Swapneswar Bisoi, Saqlain Mushtaq, Ashish Arora, and Atikur Rahman from IISER Pune, reveals the simultaneous presence of high-energy and Rashba excitons, each coupling to phonons in a distinct manner. This discovery of exciton-selective phonon coupling, demonstrated through photoluminescence, Raman and reflectance spectroscopy, provides direct evidence for controlling light-matter interactions and opens new avenues for designing advanced optoelectronic and phonon-photon-based devices. Understanding how light and vibration interact within materials has long been a complex problem. Now, detailed measurements reveal that different forms of light within perovskites couple to vibrations in distinct ways. This discovery opens up new possibilities for designing materials that control both light and sound. Scientists are increasingly focused on understanding how semiconductors interact with light and sound, a field with implications for future technologies. Controlling these interactions within lead halide perovskites, a class of material exhibiting remarkable optical properties, presents a considerable challenge. Recent investigations into cesium lead bromide (CsPbBr3) microcrystals have revealed a surprising complexity in how these materials respond to excitation. Researchers have demonstrated the simultaneous presence of two distinct types of excitons, high-energy and Rashba excitons, each coupled to unique vibra
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researchRandom Settings Boost 5G Data Speeds with Intelligent Reflective Surfaces
Researchers are tackling the challenge of effectively deploying reconfigurable intelligent surfaces (RIS) in fifth-generation new radio (5G NR) systems without the computational complexity of precise optimisation. L. Yashvanth, Raju Malleboina, and Venkatareddy Akumalla, all from the Dept. of ECE at the Indian Institute of Science (IISc), Bengaluru, India, alongside Debdeep Sarkar, Nekkanti Guna Sai Kiran, and Chandra R. Murthy, demonstrate a practical approach to harnessing RIS gains. Their work, conducted entirely within the Dept. of ECE, Indian Institute of Science (IISc), Bengaluru, India, reveals that random RIS phase configurations, combined with the proportional fair scheduling already inherent in 5G NR, can achieve near-optimal throughput. This is significant because it bypasses the need for complex control mechanisms, potentially enabling widespread and cost-effective implementation of RIS technology to enhance wireless communication performance. These surfaces, which can be digitally controlled to reflect radio signals, have emerged as a promising technology for improving signal coverage and data rates in next-generation networks. The research team successfully integrated a custom-built RIS with a real-time 5G NR system implemented using the OpenAirInterface (OAI) framework, allowing for end-to-end testing and validation under realistic wireless conditions. By randomly adjusting the phase shifts of the RIS elements, and leveraging the proportional fair (PF) scheduling algorithm within the 5G system, the researchers observed significant gains in throughput. The PF scheduler, designed to prioritize users with the best channel conditions, naturally aligns with the randomly configured RIS, effectively directing signal strength towards the most favourable receiver. Results confirm that even a randomly configured RIS, with minimal overhead, can deliver performance on par with more sophisticated, optimised RIS designs in a real-world 5G NR environment. This findi
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quantum-computingFaster-Than-Light Photons May Not Break the Rules of Cause and Effect
Scientists are increasingly investigating the implications of superluminal photon propagation arising from the Drummond-Hathrell effective action in quantum electrodynamics. Madhukar Deb, Jay Desai, and Diptimoy Ghosh, all from the Department of Physics at the Indian Institute of Science, Education and Research, Pune, have revisited the question of causality in curved spacetime using novel diagnostics. Their research establishes conditions under which this seemingly superluminal behaviour does not lead to the formation of closed causal curves, addressing a conceptually nontrivial problem in theoretical physics. By analysing both the global causal structure and applying flat-spacetime analyticity bounds to the photon commutator, the authors demonstrate causal consistency within the regime of validity of the Drummond-Hathrell effective theory for scenarios including circular photon orbits and two-black-hole geometries. The study centres on understanding whether the observed superluminality, where photons appear to travel faster than light, genuinely disrupts the established order of events. The investigation employs two independent methods to assess causal consistency. First, the team analysed the global causal structure of the effective optical metric governing photon propagation, establishing conditions under which it remains stably causal and prevents the formation of closed timelike curves. This analysis was performed for both a circular photon orbit within the Schwarzschild geometry and a linear trajectory in a two-black-hole spacetime. Secondly, researchers examined microcausality from a quantum field-theoretic perspective, treating gravity as a fixed, Lorentz-breaking field and applying flat-spacetime analyticity bounds to the photon commutator within the geometric-optics regime of the effective field theory. For the representative examples of a circular orbit in Schwarzschild spacetime and a linear trajectory in a two-black-hole geometry, the findings indicate
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quantum-computingIndia Reveals National Plan for Quantum-Safe Security
Insider Brief India is building a foundation to address the national security risks posed by quantum computing through the implementation of a Quantum Safe Ecosystem. As quantum computing rapidly advances, the Task Force, formed under the National Quantum Mission (NQM), has outlined critical steps for India to safeguard its digital infrastructure and maintain economic resilience. […]
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quantum-computingIndia poised to lead in quantum technology - Communications Today
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quantum-computingQuantum computing India's ticket to leading role in global tech space: Chandrababu Naidu - The Economic Times
Quantum computing India's ticket to leading role in global tech space: Chandrababu Naidu The Economic Times AP Quantum Valley: 1st Step In History! Gulte Breaking ground on India’s quantum future ibm.com
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quantum-computingQuantum computing Indias ticket to leading role in global tech space: Chandrababu Naidu - Mint
Amaravati, Feb 8 (PTI) India is poised to become a leading player in quantum technology, which could prove to be a game-changer for the IT sector and the wider economy, Andhra Pradesh Chief Minister N Chandrababu Naidu said on Sunday. The Quantum Valley initiative launched in Andhra Pradesh is set to usher in the next wave of the information technology (IT) revolution in the country, Naidu said in an interview with PTI Videos, emphasising that it would position India as a hardware-and-manufacturing powerhouse, in addition to being a software-and-services hub. "Technology is mature now. AI is a reality. Real-time data collection is a reality. The next level is quantum computing as it has unlimited capabilities. As of today, this is the fastest, the father of all technologies or, you can say, the mother of all technologies," he said. "Only a few countries have taken the lead in quantum technology and we are one of them. The Government of India has announced the quantum mission. Now, we are establishing it (Quantum Valley) here. With that, our people are ready to produce quantum computers and get into manufacturing now," Naidu said. Acknowledging that MoUs and investment pledges often make headlines but do not eventually lead to enough action on the ground, the chief minister said he is working on improving that conversion rate and putting in place safeguards to ensure that non-serious players are weeded out. "Earlier, I used to say ease of doing business. Now, I am going for speed of doing business. Any investor, when he invests, he is expecting returns. Then only will he survive. If his project is delayed abnormally, then naturally it will not be viable. All hurdles I want to remove. I am introducing escrow accounts for all benefits or subsidies. "I have committed something for you, year by year. I will give you online with an escrow account. You do not come to me. This is where I wanted to promote self-discipline and also government regulation," Naidu said.
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quantum-computingBreaking ground on India’s quantum future - ibm.com
Quantum ResearchBlogBreaking ground on India’s quantum futureConstruction begins on India’s Quantum Valley Tech Park as the nation grows its quantum education initiatives and prepares for its first IBM quantum computer.Date7 Feb 2026AuthorsAnupama RayRobert DavisTopicsCommunityNetworkShare this blogBlog summary: India has begun construction on the Quantum Valley Tech Park in Amaravati, the future home of the country’s first IBM quantum computer. The ground breaking arrives as a nationwide push to grow India’s quantum workforce is accelerating. For example, one free online quantum computing course co-created by IBM has already surpassed 168,000 enrollments for 2026. While construction is under way, tech park members will have access to IBM quantum computers over the cloud thanks to a collaboration between IBM and India’s Tata Consultancy Services (TCS). India takes a bold step toward scaling its quantum workforce this week as the Government of Andhra Pradesh, a State in southern India, begins construction on Quantum Valley Tech Park in the capital city of Amaravati. Quantum Valley Tech Park will soon host India’s first IBM quantum computer, and tech park members already enjoy access to IBM’s cloud-based quantum computers thanks to a partnership between IBM and India’s Tata Consultancy Services (TCS), first announced last spring. These initiatives are bringing renewed national focus to India’s ongoing efforts in quantum education and workforce development. According to a report published by the Government of India’s apex policy think tank NITI Aayog (National Institution for Transforming India) in December, India will need to train approximately 100,000 quantum developers to secure its place as a quantum computing leader in the 2030s, a decade that will be shaped by the emergence of large-scale, fault-tolerant quantum computing. The message is clear: India’s long-term competitiveness in quantum computing will hinge on the strength of its talent pipeline. “With Quantum
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quantum-computingSilicon Quantum Computing launches “Quantum Twins,” a world-first quantum simulator - Indian Chemical News
Quantum Twins are built from large arrays of qubit registers—quantum dots—patterned on pure silicon with 0.13 nanometer accuracy Quantum Simulation Imagery. ©Silicon Quantum Computing From Policy To Performance: How Lubrizol Additives Supports India's Accelerated E20 Journey Natco Pharma – Accelerating Regulatory Readiness with Revvity Signals Catalyzing Smart Growth with Industrial Intelligence The Sprint to the Summit: Unlocking Lab Efficiency through Digital Transformation Forbes Marshall - Need For Ongoing Improvement, Optimisation And Sustenance Delivering on the Promise of Prescriptive Maintenance The Sprint to the Summit: Unlocking Lab Efficiency through Digital Transformation The guiding role of fluidized and spouted bed technologies in particle building processes Navin Fluorine International commences commercial production at Rs. 450 crore Dahej AHF plant PE firm CVC to buy dsm-firmenich’s Animal Nutrition & Health business for €2.2 billion Advance Agrolife reports 25% revenue growth in 9M FY26, eyes expansion & renewable energy push Sony & 14 global partners launch world’s first renewable plastics supply chain SH Kelkar reports steady growth, eyes long-term expansion with strategic investments Germany launches landmark North Sea hydrogen pipeline project DMCC Speciality Chemicals reports solid Q3, eyes growth amid volatile commodity prices Ester Industries’ Q3 margins hit by tariff shock, dumping pressure Stallion India Fluorochemicals to invest Rs. 200 crore in Rajasthan HFO plant Congo LNG Phase 2 goes live, strengthening global gas supply Indian Chemical News is an important online resource for news, views, analysis, trends, technology updates and interviews with prominent leaders in the chemical and petrochemical space.Indian Chemical News is a media company with interests in online publishing and industry events related to the chemical and allied sectors. Get Indian Chemical News top stories every morning in your email inbox.
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quantum-computingQuantum Kernel Methods Show Competitive Radar Classification with 133-Qubit IBM Processor
Researchers are increasingly exploring quantum machine learning for complex signal processing tasks, and this study investigates the practical application of quantum kernel methods to radar micro-Doppler classification. Vikas Agnihotri, Jasleen Kaur from the National Institute of Technology, Rourkela, and Sarvagya Kaushik from the Indian Institute of Technology, Dhanbad, et al., demonstrate a Quantum Support Vector Machine (QSVM) capable of classifying aerial targets from radar signatures, even with the limitations of current noisy intermediate-scale quantum (NISQ) hardware. By combining classical feature extraction with quantum kernel encoding and evaluating performance on both simulators and IBM quantum processors, this work offers a crucial assessment of the feasibility and challenges of deploying quantum algorithms for real-world radar applications, potentially paving the way for more efficient and accurate target recognition systems. The research team extracted classical features and reduced their dimensionality using Principal Component Analysis (PCA) to facilitate efficient quantum encoding. Reduced feature vectors were then embedded into a quantum kernel-induced feature space via a fully entangled ZZFeatureMap before classification using a kernel-based QSVM. This reduction in dimensionality is crucial for efficient quantum processing and encoding of complex radar signals. The study systematically investigated the impact of noise, decoherence, and measurement shot count on quantum kernel estimation, identifying improved stability and fidelity on the newer Heron r2 architecture. By mapping micro-Doppler patterns into an expanded quantum state space, the classifier can more easily separate subtle differences in target dynamics. This work provides a comprehensive comparison between simulator-based and hardware-based QSVM implementations, highlighting both the feasibility and current limitations of deploying quantum kernel methods for practical radar signal class
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quantum-computingPicoseconds on Demand: Tiqker Optical Atomic Clock Cruises the Quantum Corridor
Right on Time: Bringing Picosecond Precision to Live Networks I’m excited to finally get to share that Infleqtion, together with Quantum Corridor, completed a successful live demonstration of a high-performance quantum timing solution for critical networked infrastructure. We ran the test across 22 kilometers of live urban fiber, between Chicago’s ORD10 Data Center and the Digital Crossroad Data Center in Hammond, Indiana and back. Tiqker, Infleqtion’s 3U rack-mounted optical atomic clock, empowered with the White Rabbit time transfer protocol, held picosecond-level synchronization. The system outperformed traditional rack references and GPS-derived time on the short-to-medium timescales that matter for modern network data systems. Figure 1: Tiqker installation in Hammond, Indiana This matters because the future depends on timing that actually matches how fast hardware performs. What we showed is that deterministic, picosecond-class timing can be delivered over existing fiber in real conditions, aligning timing precision with the physical timescales of contemporary optical network hardware. We ran the test in the real world – these aren’t lab numbers. Figure 2: Tiqker units, White Rabbit switches and time distribution installed at Digital Crossroads. Where Timing Is Everything The potential applications for Tiqker optical atomic clocks are wide-ranging. In data centers and distributed computing, picosecond timing enables precise packet alignment, cutting time buffers and improving throughput. Emerging telecommunications systems using time-sensitive networking require deterministic time, while financial customers gain more accurate timestamps for trading, audit, and model training data. Defense, national security and critical infrastructure
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quantum-computingInfleqtion and Quantum Corridor Demonstrate GPS-Free Quantum Timing Solution for Critical Network Infrastructure
Live test between Chicago and Northwest Indiana shows up to 40X improvement over GPS for keeping digital systems synchronized Infleqtion, a global leader in quantum sensing and quantum computing powered by neutral-atom technology, today announced a successful live demonstration with Quantum Corridor showing how critical digital infrastructure can stay precisely synchronized without relying on GPS. Quantum Corridor is a quantum-safe, ultra-fast, and highly secure fiber-optic network in the Midwest enabling next-generation communication. The demonstration was conducted across 21.8 kilometers of live urban fiber between Chicago’s ORD10 Data Center (350 Cermak) and the Digital Crossroad Data Center (100 Digital Crossroad Drive) in Hammond, IN. The announcement follows Infleqtion’s plans to go public through a merger with Churchill Capital Corp X (NASDAQ: CCCX). Modern digital systems, from data centers and financial trading platforms to AI networks and defense systems, depend on precise timing to function properly. Today, most rely on GPS satellites to stay synchronized. But GPS signals can be jammed, spoofed, or disrupted, creating a single point of failure for critical infrastructure. As these systems grow more complex and handle more data, they need timing that is more precise, more stable, and more secure than GPS alone can provide. “As digital infrastructure scales, relying on a single source of time is a growing risk,” said Pranav Gokhale, CTO, Infleqtion. “This demonstration shows that quantum grade timing can be delivered over existing fiber, giving operators a more precise and resilient alternative to GPS for keeping critical systems in sync.” What Was Demonstrated The demonstration leveraged Infleqtion’s Tiqker, a rugged, rack mounted quantum optical atomic clock designed for deployment in operational environments. Operating on Quantum Corridor’s in situ dark fiber, the system maintained picosecond level synchronization while continuing to perform th
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quantum-computingQuantum Machines Becomes Sixth Tenant at Illinois Quantum Park
Insider Brief Quantum Machines, an Israeli quantum software company, plans to establish a lab at the Illinois Quantum and Microelectronics Park on Chicago’s South Side, becoming the sixth tenant to commit to the state-backed research campus. The company develops control software that links quantum computers with classical systems and says its technology is used by more than half of companies building quantum computers worldwide. Illinois has committed $500 million to the park as part of a broader effort to attract quantum companies, research activity and investment and position the state as a leading U.S. quantum hub. Aerial view of the former U.S. Steel South Works site (IQMP) Quantum Machines, quantum software company from Israel, plans to expand into Chicago, adding another anchor tenant to Illinois’ push to build a nationally prominent quantum technology hub. According to Crain’s Chicago Business, the company expects to establish a presence at the Illinois Quantum and Microelectronics Park, a 138-acre research campus under construction on the former U.S. Steel South Works site along Lake Michigan near the Indiana border. The company would become the sixth tenant to publicly commit to the park, which is positioned as the centerpiece of Illinois’ quantum strategy. Quantum Machines develops software that controls quantum computers and connects them with conventional computing systems. While quantum computers rely on the rules of quantum physics rather than classical electronics, they still require traditional hardware and software to operate, manage data and run hybrid workloads. Quantum Machines’ tools sit at that interface, coordinating how quantum processors execute instructions and exchange information with classical machines. The strength of the Illinois ecosystem is one of the reasons the company established a base in Chicago, company executives told Crain’s Chicago Business. “While QM has strong partnerships across the U.S. quantum ecosystem, the decision to
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quantum-computingAdiabatic Rapid Passage Achieves Low Multiphoton Emission for Quantum Key Distribution
Researchers are continually striving to improve the security and efficiency of quantum key distribution (QKD), a method for creating encryption keys using the laws of quantum mechanics. Parvendra Kumar from the Optics and Photonics Centre, Indian Institute of Technology Delhi, alongside colleagues, investigates single-photon generation using a negatively charged quantum dot within a microcavity, exploring both resonant excitation and adiabatic rapid passage (ARP) techniques. This work is significant because it demonstrates that ARP excitation substantially reduces unwanted multiphoton emissions and enhances photon indistinguishability, ultimately leading to a modest but consistent improvement in secure key rates for BB84 and twin-field QKD protocols when compared to conventional Poisson-distributed sources. The findings suggest quantum dot sources offer advantages over existing technologies at shorter distances, paving the way for more practical and secure quantum communication networks. ARP excitation boosts single-photon source performance Scientists have demonstrated a significant advancement in quantum key distribution (QKD) by optimising single-photon generation from a negatively charged quantum dot embedded within an elliptical pillar microcavity. This research addresses a critical need for bright single-photon sources exhibiting minimal multiphoton emission, a key requirement for secure quantum communication protocols. The team investigated two excitation methods, resonant excitation and adiabatic rapid passage (ARP) , to drive the quantum dot, revealing that ARP excitation substantially reduces the probability of emitting multiple photons and simultaneously enhances photon indistinguishability. This improvement is crucial for bolstering the security and efficiency of QKD systems. Experiments focused on meticulously characterising the single-photon emission properties under both excitation schemes. Researchers employed a negatively charged quantum dot, levera
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quantum-computingHierarchical Quantum Decoders Achieve Optimality with Tunable Speed and Accuracy Tradeoffs
Researchers are tackling the crucial challenge of decoding quantum information, a key step towards building practical fault-tolerant computers. Nirupam Basak (Indian Statistical Institute, Kolkata), Ankith Mohan (Virginia Polytechnic Institute and State University), and Andrew Tanggara (National University of Singapore) et al. present a novel family of hierarchical decoders that offer a tunable balance between decoding speed and accuracy, crucially retaining guarantees of optimality. By applying techniques from optimisation theory , specifically the Lasserre Sum-of-Squares (SOS) hierarchy , they formulate the decoding problem as a sequence of Semidefinite Programs, allowing for a controlled trade-off between computational cost and solution quality. Demonstrating significant performance gains over existing methods on codes such as rotated surface and honeycomb codes, this work represents a substantial step forward in bridging the gap between the speed of heuristic decoders and the reliability of rigorous, optimal solutions. The research addresses a critical challenge in building reliable quantum computers: efficiently correcting errors that arise from environmental interactions. While identifying the optimal error correction is computationally difficult , an NP-hard problem , existing approximate decoders often rely on uncontrolled heuristics. This work introduces a novel approach using the Lasserre Sum-of-Squares (SOS) hierarchy from optimization theory to relax the decoding problem, creating a sequence of Semidefinite Programs (SDPs) where lower levels are faster but approximate, and higher levels are slower but more accurate. The team achieved a significant breakthrough by demonstrating that even the lower levels of this SOS hierarchy substantially outperform standard Linear Programming relaxations commonly used in quantum decoding. By formulating the decoding problem as a series of SDPs, the researchers created a framework that allows for a controlled trade-off b
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quantum-computingQuantum Computing Inc. completes $110 million acquisition of Luminar unit By Investing.com - Investing.com India
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quantum-computingRigetti’s India Quantum Win Offsets Setbacks And Shapes Valuation Story - simplywall.st
United States/Semiconductors/NasdaqCM:RGTIRigetti’s India Quantum Win Offsets Setbacks And Shapes Valuation Story January 28, 2026Simply Wall StReviewed by Bailey PembertonShareCopy Link Rigetti Computing (NasdaqCM:RGTI) secured its first major international order for a 108 qubit quantum system from India’s Centre for Development of Advanced Computing. The order marks Rigetti’s entry into India’s high performance computing ecosystem and a new phase of commercial activity outside the U.S. At the same time, the company did not advance in a key DARPA quantum program and has delayed new system launches, highlighting competitive pressure. Rigetti Computing, a quantum computing hardware and services company listed on NasdaqCM:RGTI, now has a substantial foothold in India’s supercomputing efforts through this 108 qubit system order. For investors tracking quantum hardware vendors, this type of institutional sale can be an important signal of customer interest beyond research pilots or early access programs. The missed DARPA opportunity and system launch delays point to a tougher competitive field, which is worth watching if you are comparing Rigetti with other quantum players. The combination of cross border demand and product timing challenges creates a mixed but meaningful backdrop as the company works to position its technology in government and commercial markets. Stay updated on the most important news stories for Rigetti Computing by adding it to your watchlist or portfolio. Alternatively, explore our Community to discover new perspectives on Rigetti Computing. NasdaqCM:RGTI Earnings & Revenue Growth as at Jan 2026 How Rigetti Computing stacks up against its biggest competitors AdvertisementQuick Assessment ✅ Price vs Analyst Target: At US$22.31, the share price sits below the US$38.85 analyst price target range midpoint. ✅ Simply Wall St Valuation: Simply Wall St views the stock as undervalued, trading about 50.5% below its estimated fair value.
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