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A Quantum Optimization Framework for Data-Assimilation-Augmented Parameter Estimationquantum-computing

A Quantum Optimization Framework for Data-Assimilation-Augmented Parameter Estimation

--> Quantum Physics arXiv:2608.13614 (quant-ph) [Submitted on 12 Aug 2026] Title:A Quantum Optimization Framework for Data-Assimilation-Augmented Parameter Estimation Authors:Muhammad Jalil Ahmad, Mohammadhossein Mohammadisiahroudi, Animikh Biswas, Kathleen Hoffman View a PDF of the paper titled A Quantum Optimization Framework for Data-Assimilation-Augmented Parameter Estimation, by Muhammad Jalil Ahmad and 3 other authors View PDF HTML (experimental) Abstract:Parameter estimation is a fundamental challenge in the calibration of ordinary differential equation (ODE) models, where repeated numerical integration can lead to high computational cost. In this work, we investigate whether quantum algorithms can be leveraged to assist parameter estimation in nonlinear dynamical systems. We develop a hybrid classical-quantum framework that reformulates a data-assimilation-augmented parameter estimation problem as a combinatorial optimization task. Model dynamics and data assimilation are enforced entirely on the classical side, while the resulting parameter estimation cost functional is discretized and approximated by a quadratic unconstrained binary optimization (QUBO) surrogate. This surrogate is mapped to an Ising Hamiltonian, and quantum optimizers are used to search for low-energy configurations corresponding to candidate parameter estimates. We apply the framework to SIS and SIR epidemic models, the chaotic Lorenz-63 system, and a high-dimensional two-layer Lorenz-96 system. In this setting, the method is used to recover classical system parameters from partial state observations across steady-state, chaotic, and high-dimensional multiscale dynamical systems. Numerical experiments with synthetic data show that the proposed approach accurately recovers parameters while requiring data-assimilation solves only on a prescribed coarse grid. The framework avoids quantum state tomography, illustrating a viable pathway for integrating quantum optimization into data-driven par

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A scalable edge-pass Purcell filter for high-fidelity readout of superconducting qubitsquantum-computing

A scalable edge-pass Purcell filter for high-fidelity readout of superconducting qubits

--> Quantum Physics arXiv:2608.13627 (quant-ph) [Submitted on 13 Aug 2026] Title:A scalable edge-pass Purcell filter for high-fidelity readout of superconducting qubits Authors:Xudong Liao, Yuan Li, Sainan Huai, Shuyi Pan, Zhenxing Zhang, Zhiwen Zong, Kunliang Bu, Yulei Ye, Wen Zheng, Xinsheng Tan, Yang Yu, Xiaopei Yang, Tianqi Cai, Shengyu Zhang View a PDF of the paper titled A scalable edge-pass Purcell filter for high-fidelity readout of superconducting qubits, by Xudong Liao and 13 other authors View PDF HTML (experimental) Abstract:High-fidelity readout with strong Purcell protection of qubit coherence is essential for scalable superconducting quantum processors, yet the finite passband and sizable footprint of conventional band-pass Purcell filters make them hard to scale. Here we introduce a scalable edge-pass Purcell filter that separates the readout band from the protected qubit band by a single transmission edge, freeing the readout resonators from bandwidth constraint. Depending on whether the transmitting band lies above or below the cutoff, the compact network is realized as a high-pass filter (HPF) or a low-pass filter (LPF). The HPF reaches an average readout fidelity of 99.46(4)% (up to 99.56%) with a 150-ns pulse, and the LPF reaches 99.49(3)% (up to 99.57%) with a 130-ns pulse. The average single-qubit gate fidelities are 99.94% (HPF) and 99.93% (LPF). Relative to the filter-free Purcell limit, the filters substantially extend the qubit lifetime, and the Purcell protection deepens at higher filter order. In addition, an intrinsic dissipation mode of the filter offers a qubit-reset channel. This leads to a compact architecture that unifies fast, high-fidelity readout, Purcell protection, and effective reset within a single filter for large-scale fault-tolerant quantum computation. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2608.13627 [quant-ph]   (or arXiv:2608.13627v1 [quant-ph] for this version)   https://doi.org/10.48

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Heuristic Lookahead Distillation Protocol Searchquantum-computing

Heuristic Lookahead Distillation Protocol Search

--> Quantum Physics arXiv:2608.13644 (quant-ph) [Submitted on 13 Aug 2026] Title:Heuristic Lookahead Distillation Protocol Search Authors:Matthew Barber, Stefano Pirandola View a PDF of the paper titled Heuristic Lookahead Distillation Protocol Search, by Matthew Barber and 1 other authors View PDF HTML (experimental) Abstract:Bipartite qubit entanglement distillation is the process of converting noisy ebits into pure ebits using only local operations and classical communication. This is a core operation for quantum repeaters, enabling such crucial tasks as long-distance quantum communication and distributed quantum computing. In this work, we introduce a method for searching for entanglement distillation protocols and, using this technique, distil qubit Werner states at a higher rate than could be achieved using previously discovered protocols. In particular, we demonstrate the advantage of our new distillation strategy by improving the best-known lower bound for the two-way-assisted quantum capacity of the qubit depolarising channel across a wide range of channel parameters, making progress in one of the long-standing problems of quantum information theory. Comments: Subjects: Quantum Physics (quant-ph); Other Condensed Matter (cond-mat.other); Mathematical Physics (math-ph); Optics (physics.optics) Cite as: arXiv:2608.13644 [quant-ph]   (or arXiv:2608.13644v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.13644 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Stefano Pirandola [view email] [v1] Thu, 13 Aug 2026 18:00:02 UTC (368 KB) Full-text links: Access Paper: View a PDF of the paper titled Heuristic Lookahead Distillation Protocol Search, by Matthew Barber and 1 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-08 Change to browse by: cond-mat cond-mat.other math math-ph

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Tracking real-space quantum state breathing through Floquet-projector geometryquantum-computing

Tracking real-space quantum state breathing through Floquet-projector geometry

--> Quantum Physics arXiv:2608.13649 (quant-ph) [Submitted on 13 Aug 2026] Title:Tracking real-space quantum state breathing through Floquet-projector geometry Authors:Arpit Raj, Johannes Mitscherling, Björn Trauzettel View a PDF of the paper titled Tracking real-space quantum state breathing through Floquet-projector geometry, by Arpit Raj and 2 other authors View PDF HTML (experimental) Abstract:Periodic driving of spatially periodic quantum systems generates band structures that are absent in static crystals. We present a quantum geometric theory to characterize the Floquet-Bloch states at stroboscopic times and during micromotion on equal footing. Our framework builds upon time-evolved Floquet projectors that connect static quantum geometry, micromotion-operator geometry, and Floquet topology. To illustrate the formalism, we introduce the Floquet-projector quantum metric, which we employ to characterize the real-space breathing of localized states in a driven chiral-symmetric integrable spin chain. The Floquet-projector quantum metric, integrated over the Brillouin zone, captures the oscillatory variance during micromotion and, at symmetry-selected times, is bounded below by Floquet topological invariants. We further describe how the Floquet projector geometry enables a systematic investigation of micromotion dynamics in periodically driven lattice systems. Comments: Subjects: Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Cite as: arXiv:2608.13649 [quant-ph]   (or arXiv:2608.13649v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.13649 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Arpit Raj [view email] [v1] Thu, 13 Aug 2026 18:00:02 UTC (858 KB) Full-text links: Access Paper: View a PDF of the paper titled Tracking real-space quantum state breathing through Floquet-projector geometry, by Arpit Raj and 2 other authorsView PDFHTML (experimental)TeX Source view license Curr

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Entanglement Negativity in Noisy Quantum Volume Samplingquantum-computing

Entanglement Negativity in Noisy Quantum Volume Sampling

--> Quantum Physics arXiv:2608.13654 (quant-ph) [Submitted on 13 Aug 2026] Title:Entanglement Negativity in Noisy Quantum Volume Sampling Authors:Elijah Pelofske, Stephan Eidenbenz View a PDF of the paper titled Entanglement Negativity in Noisy Quantum Volume Sampling, by Elijah Pelofske and 1 other authors View PDF HTML (experimental) Abstract:The Quantum Volume protocol uses scrambling random circuits to benchmark NISQ computers. Quantum Volume is generally well-regarded as a benchmark for small, noisy, quantum computers because it requires the quantum computer to implement many non-local entangling gates within a square-shaped circuit, which incentivizes high qubit count, long qubit coherence times, and low error rates on all hardware gates. Quantum Volume circuits inherently produce high-entanglement states that are fragile to errors and decoherence. The Quantum Volume benchmark measures an observable called heavy-output-probability (HOP), where an HOP of $0.5$ corresponds to complete loss of coherence, and in the limit of system size an HOP $\approx 0.84$ for a fully coherent quantum processor. Here, we numerically study the tradeoff between depolarizing noise, entanglement as quantified by the bipartite negativity measure, and HOP in quantum volume circuits. Our results contextualize prior small scale quantum volume demonstrations on quantum computers and highlight that under depolarizing noise, due to finite system size effects heavy output probabilities can be greater than $0.5$ while the bipartite negativity entanglement has been destroyed. This implies, although improbable, that a NISQ computer could pass the Quantum Volume benchmark test threshold of $2/3$ while the underlying quantum computation has no global entanglement -- albeit only for small $n$. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2608.13654 [quant-ph]   (or arXiv:2608.13654v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.13654 Focus to learn more arXi

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Open system probes of renormalization group flowquantum-computing

Open system probes of renormalization group flow

--> Quantum Physics arXiv:2608.13664 (quant-ph) [Submitted on 13 Aug 2026] Title:Open system probes of renormalization group flow Authors:Andrew Keefe, Brenden Bowen, Saptarshi Biswas, Albion Lawrence, Nishant Agarwal, Archana Kamal View a PDF of the paper titled Open system probes of renormalization group flow, by Andrew Keefe and 5 other authors View PDF HTML (experimental) Abstract:Open system probes can provide an efficient means to characterize quantum many-body systems by employing them as engineered environments. The key idea is to map long-range spatial correlations of the environment onto dynamical correlations in the evolution of a simple quantum probe. Using the example of a qubit coupled to a transverse-field Ising model, we show how the non-Markovian rate or spectral flow can be used to identify stable and unstable fixed points, infer scaling dimensions of relevant fields, and deduce the renormalization group flow induced by deformations around any fixed point. Comments: Subjects: Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Statistical Mechanics (cond-mat.stat-mech); High Energy Physics - Theory (hep-th) Cite as: arXiv:2608.13664 [quant-ph]   (or arXiv:2608.13664v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.13664 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Archana Kamal [view email] [v1] Thu, 13 Aug 2026 18:03:49 UTC (1,088 KB) Full-text links: Access Paper: View a PDF of the paper titled Open system probes of renormalization group flow, by Andrew Keefe and 5 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-08 Change to browse by: cond-mat cond-mat.mes-hall cond-mat.stat-mech hep-th References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation

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Efficient Hamiltonian Truncation: Fast Matrix Construction and Quantum Krylov Diagonalizationquantum-computing

Efficient Hamiltonian Truncation: Fast Matrix Construction and Quantum Krylov Diagonalization

--> Quantum Physics arXiv:2608.13691 (quant-ph) [Submitted on 13 Aug 2026] Title:Efficient Hamiltonian Truncation: Fast Matrix Construction and Quantum Krylov Diagonalization Authors:Rachel Houtz, Marco Knipfer, Konstantin Matchev, Alexander Roman, Mia West View a PDF of the paper titled Efficient Hamiltonian Truncation: Fast Matrix Construction and Quantum Krylov Diagonalization, by Rachel Houtz and 4 other authors View PDF HTML (experimental) Abstract:Hamiltonian truncation offers a nonperturbative route to quantum field theory, yet its accuracy is limited by the rapid expansion of the truncated Hilbert space, which drives up computational cost. We tackle this bottleneck with a hybrid strategy that pairs classical and quantum algorithms: 1) we develop an efficient basis-generation scheme built on integer partitions; 2) we speed up the construction of the sparse Hamiltonian matrix using symmetry-aware algorithms; and 3) we explore quantum Krylov diagonalization as a route to the low-lying spectrum. Benchmarking against the free massive scalar and $\phi^4$ theories in two spacetime dimensions, we achieve substantial gains in the computational efficiency of Hamiltonian truncation and chart a path toward future quantum implementations. Comments: Subjects: Quantum Physics (quant-ph); High Energy Physics - Lattice (hep-lat); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th) Report number: KA-TP-19-2026 Cite as: arXiv:2608.13691 [quant-ph]   (or arXiv:2608.13691v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.13691 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Mia West [view email] [v1] Thu, 13 Aug 2026 18:37:19 UTC (5,055 KB) Full-text links: Access Paper: View a PDF of the paper titled Efficient Hamiltonian Truncation: Fast Matrix Construction and Quantum Krylov Diagonalization, by Rachel Houtz and 4 other authorsView PDFHTML (experimental)TeX Sourc

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Scalable Test of Genuine Multipartite Entanglement via Partially Randomized Measurementsquantum-computing

Scalable Test of Genuine Multipartite Entanglement via Partially Randomized Measurements

--> Quantum Physics arXiv:2608.13725 (quant-ph) [Submitted on 13 Aug 2026] Title:Scalable Test of Genuine Multipartite Entanglement via Partially Randomized Measurements Authors:Jan Wojcik, Pawel Chrabkowski, Wieslaw Laskowski View a PDF of the paper titled Scalable Test of Genuine Multipartite Entanglement via Partially Randomized Measurements, by Jan Wojcik and 2 other authors View PDF HTML (experimental) Abstract:Certifying genuine multipartite entanglement in quantum systems can require a number of measurements that grows exponentially with the system size. Here we introduce a criterion based on correlation-tensor subsector lengths restricted to local measurement planes and show that it can be evaluated using partially randomized measurements without an explicit exponential dependence on the number of qubits. We derive the corresponding bounds for $k$-separable states and illustrate the criterion using representative families of multipartite entangled states. Finally, we demonstrate the practical applicability of the method on an ion-trap quantum computer by certifying genuine five-partite entanglement. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2608.13725 [quant-ph]   (or arXiv:2608.13725v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.13725 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Wieslaw Laskowski [view email] [v1] Thu, 13 Aug 2026 19:37:49 UTC (131 KB) Full-text links: Access Paper: View a PDF of the paper titled Scalable Test of Genuine Multipartite Entanglement via Partially Randomized Measurements, by Jan Wojcik and 2 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-08 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bo

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Designing robust molecular spins for quantum technologies with theoretical chemistryquantum-computing

Designing robust molecular spins for quantum technologies with theoretical chemistry

--> Quantum Physics arXiv:2608.13744 (quant-ph) [Submitted on 13 Aug 2026] Title:Designing robust molecular spins for quantum technologies with theoretical chemistry Authors:Timothy J. Krogmeier, Pranay Venkatesh, Mikayla Z. Fahrenbruch, Anthony W. Schlimgen, Andres Montoya-Castillo, Kade Head-Marsden View a PDF of the paper titled Designing robust molecular spins for quantum technologies with theoretical chemistry, by Timothy J. Krogmeier and 5 other authors View PDF HTML (experimental) Abstract:Molecular spins represent a versatile platform for quantum information science, with the potential to offer chemically tunable, addressable qubits. However, achieving this requires understanding and mitigating quantum decoherence. This Chapter provides a theoretical overview of current state-of-the-art chemical theory connecting ab initio electronic structure with open quantum system dynamics to guide the rational design of long-lived molecular qubits. Beginning at the electronic level, multi-reference and relativistic electronic structure methods to parameterize effective spin Hamiltonians are discussed, with a primary focus on accurately capturing $g$-tensors, zero-field splitting, and hyperfine interactions. These parameters feed into models of spin-phonon and spin-spin coupling to quantify $T_1$ and $T_2$ relaxation across various environmental regimes. This Chapter evaluates a hierarchy of dynamical methods, ranging from factorization to matrix product state approaches, balancing computational cost against accuracy and generalizability. Ultimately, mapping these theoretical models to molecular architecture can establish design principles, such as isotopic substitution and spatial spin delocalization, to understand and extend coherence lifetimes. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2608.13744 [quant-ph]   (or arXiv:2608.13744v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.13744 Focus to learn more arXiv-issued DOI via Data

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Entanglement asymmetry characterization of the Chiral Anomalyquantum-computing

Entanglement asymmetry characterization of the Chiral Anomaly

--> Quantum Physics arXiv:2608.13781 (quant-ph) [Submitted on 13 Aug 2026] Title:Entanglement asymmetry characterization of the Chiral Anomaly Authors:Alfred Benedito German Sierra View a PDF of the paper titled Entanglement asymmetry characterization of the Chiral Anomaly, by Alfred Benedito German Sierra View PDF HTML (experimental) Abstract:Shao et al. recently showed that the 1+1D staggered fermion Hamiltonian admits a whole algebra of lattice operators that flow to the same axial charge in the thermodynamic limit (TL). On the lattice the principal axial charge does not commute with the vector charge, although their commutator is expected to vanish in the TL, providing a lattice realization of the chiral anomaly. We investigate the effect of this anomaly on the ground state(s) using the entanglement asymmetry. Unexpectedly, the asymmetry remains nonzero in the TL, despite the vanishing of the commutator, and exhibits a novel scaling behavior. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2608.13781 [quant-ph]   (or arXiv:2608.13781v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.13781 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Alfred Benedito [view email] [v1] Thu, 13 Aug 2026 21:20:31 UTC (2,043 KB) Full-text links: Access Paper: View a PDF of the paper titled Entanglement asymmetry characterization of the Chiral Anomaly, by Alfred Benedito German SierraView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-08 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Conne

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Fast classical simulation of `Fast, accurate, high-resolution simulation of large-scale Fermi-Hubbard models on a digital quantum processor'quantum-computing

Fast classical simulation of `Fast, accurate, high-resolution simulation of large-scale Fermi-Hubbard models on a digital quantum processor'

--> Quantum Physics arXiv:2608.13805 (quant-ph) [Submitted on 13 Aug 2026] Title:Fast classical simulation of `Fast, accurate, high-resolution simulation of large-scale Fermi-Hubbard models on a digital quantum processor' Authors:Xiao-Yu Ouyang, Runze Chi, Garnet Kin-Lic Chan View a PDF of the paper titled Fast classical simulation of `Fast, accurate, high-resolution simulation of large-scale Fermi-Hubbard models on a digital quantum processor', by Xiao-Yu Ouyang and 1 other authors View PDF HTML (experimental) Abstract:We study the Néel quench dynamics of a 1D Fermi-Hubbard model which has recently been simulated on quantum hardware. We demonstrate that the set of 7260 observable trajectories measured in the quantum experiment can be obtained more quickly and accurately through classical tensor network simulation using modest computation. Our result relies on transverse tensor network contraction, where a bond dimension of 32 is already sufficient to reproduce the quantum experiment. We further extend the converged observable trajectories to longer times than in the hardware simulation and in other recent classical simulations. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2608.13805 [quant-ph]   (or arXiv:2608.13805v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2608.13805 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Xiao-Yu Ouyang [view email] [v1] Thu, 13 Aug 2026 22:31:30 UTC (1,382 KB) Full-text links: Access Paper: View a PDF of the paper titled Fast classical simulation of `Fast, accurate, high-resolution simulation of large-scale Fermi-Hubbard models on a digital quantum processor', by Xiao-Yu Ouyang and 1 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-08 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loa

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