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Live trends in quantum computing research, updated daily from arXiv.
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Optimizing and Certifying Multipartite Permutationally Invariant Bell Inequalities
Jin-Fu Chen, Mengyao Hu, Jordi Tura·Jul 9, 2026
Multipartite Bell nonlocality provides a device-independent probe of many-body quantum correlations, but its characterization is limited by the rapid growth of the underlying classical and quantum optimization problems. We develop a scalable method f...
Exactly solved Schrödinger equations with time-dependent Hamiltonians
Michael Warnock, Antônio Francisco Neto, Pierre-Louis Giscard +2 more·Jul 9, 2026
We present the analytical, exact, explicit, and assumption free formulas for the evolution operators corresponding to four instances of time-dependent Hamiltonians relevant to quantum spin batteries including two stochastic cases. We demonstrate how ...
Simulation of exchange coupling effects in double quantum dot FinFET-like structures
Ilan Bouquet, Alexander Maeder, Mathieu Luisier·Jul 9, 2026
By leveraging a GPU-accelerated Schrödinger-Poisson (SP) solver, we characterize exchange coupling in a hole spin double-qubit device involving a double quantum dot (DQD) system formed inside a 5-gate silicon fin field-effect transistor (FinFET) simi...
Global Precision Limits in Critical Quantum Metrology: From Cramér-Rao to Ziv-Zakai
Neng Zeng, Tao Liu, Yu-Ran Zhang·Jul 9, 2026
Critical quantum metrology with equilibrium states predicts quantum-enhanced sensitivity only in the vicinity of criticality, where large prior information about the parameter is required. By employing quantum Ziv-Zakai bounds, we derive a limit on t...
Quantum and Classical Potts Criticality in Driven-Dissipative Bosonic Lattices
Jacopo Tosca, Zejian Li, Cristiano Ciuti·Jul 9, 2026
The emergence of equilibrium universality from intrinsically nonequilibrium dynamics is a fundamental open problem. Bose-Hubbard lattices realized in photonic and circuit-QED platforms provide a versatile setting to engineer nonlinear interactions, d...
Fourier imaging of collective spontaneous emission modes in superradiant cold atomic clouds
Adrien Gavalda, Guillaume Tremblier, Martin Poitrinal +3 more·Jul 9, 2026
We measure the spatial pattern associated with the superradiant emission from a cloud of cold 87Rb atoms using Fourier imaging. We observe a highly directional, ring-shaped emission structure, which corresponds to a single collective jump operator as...
Efficient photo-ionizing elimination of detrimental electric fields for Rydberg atoms
Zhou-Chen Deng, Hao-Nan Lin, Yu-Cheng Duan +10 more·Jul 9, 2026
Rydberg atoms are highly sensitive to external electric fields due to their exaggerated electronic properties. This unique feature lays the foundation for many of their applications in quantum science. However, an uncontrolled stray electric field ca...
The Geometry of Quantum Complexity in Open Systems
Ezra Acalapati, Kausik Ghosh, Giuseppe Policastro·Jul 9, 2026
We extend Nielsen's geometric approach for quantum complexity from closed to open quantum systems, whose dynamics is governed by Lindbladian evolution. In this framework, complexity is defined through an optimal-control problem on the space of mixed ...
Who Needs DRAM? We Have Fiber
Hannah Atmer, Yuan Yao, Thiemo Voigt +1 more·Jul 9, 2026
The rising pressure on DRAM availability and contract pricing reflects generative AI's massive high-performance memory requirements. This pressure is heavily compounded by hyperscale data center expansion, which now consumes a significant portion of ...
Efficiently simulable quantum circuits with large entanglement, magic, and non-Gaussianity via code-compiled tensor networks
Aydin Deger, Stergios Koutsioumpas, Mark Webster +3 more·Jul 9, 2026
We introduce a family of quantum circuits that possess standard indicators of classical simulation hardness including high entanglement entropy, magic, and non-Gaussianity, yet admit efficient classical simulation via matrix product states (MPS). Our...
Parallel QEC Decoding Applied to Distributed Quantum Computing
Gabriele Incardona, Davide Ferrari, Michele Amoretti·Jul 9, 2026
A novel parallel approach is proposed for QEC decoding based on Belief Propagation with Ordered Statistics Decoding. The main idea is to pre-process the error vectors obtained from Belief Propagation by applying Singular Value Decomposition locally t...
Stroboscopic Stabilization of Cat Qubits
Timo Hillmann, Franco Nori, Fernando Quijandría·Jul 9, 2026
Dissipatively stabilized cat qubits provide a promising route toward fault-tolerant quantum computation, exhibiting exponential suppression of bit-flip errors with increasing phase-space separation of the logical states, while incurring only a linear...
Grokking and epoch-wise double descent in quantum neural networks
Daniel Pranjić, Marco Roth, Christian Tutschku·Jul 9, 2026
Grokking, the delayed transition from memorization to generalization, is a fundamental phenomenon in gradient-based learning, yet its dynamics within variational quantum machine learning (QML) remain largely unexamined. In this work, we report the em...
Works on My QPU: Reproducibility in Quantum Computing Research
Dominik Köster, Maja Franz, Benjamin Zec +3 more·Jul 9, 2026
Quantum computing research increasingly depends on complex software stacks, yet the reproducibility of published results does not receive the priority and longevity mandated by recommendations of large international scientific bodies and best practic...
Approximate eigenfunctions for some aperiodic crystals
Long Meng·Jul 9, 2026
In this paper, we consider Hamiltonians for aperiodic crystals of the form \begin{align*} H_\varepsilon:=T(-i\nabla_x+{\mathbf A}(x,\varepsilon x))+V(x,\varepsilon x),\qquad x\in {\mathbb R}^d \end{align*} where $T$ represents either a Dirac operator...
Magnetic control of Goos-Hänchen shifts and group delay time in monolayer WSe$_2$
Youssef Fattasse, Rachid El Aitouni, Miloud Mekkaoui +3 more·Jul 9, 2026
We study the influence of an external magnetic field on the Goos-Hänchen (GH) shift and the group delay time (GDT) in monolayer WSe$_2$ in the presence of a magnetic barrier. The transport properties of Dirac-like carriers are obtained by solving the...
Wigner symmetries single out symmetric Wasserstein distances in all finite dimensions
Gergely Bunth·Jul 9, 2026
We study the quantum Wasserstein distances introduced by De Palma and Trevisan associated with quadratic cost operators generated by families of self-adjoint observables. We first show that an arbitrary positive semidefinite cost operator is complete...
Interplay of Quasiperiodic Criticality and the Non-Hermitian Skin Effect
Zhangyuan Chen, Xianqi Tong, Xiaosen Yang·Jul 9, 2026
Quasiperiodic lattices can host critical eigenstates, whereas nonreciprocal hopping in non-Hermitian lattices can induce non-Hermitian skin effect. In this work, we investigate localization phenomena in a Hatano--Nelson model with quasiperiodically m...
Engineering Nonclassical States via the Dynamical Casimir Effect
Maristella Crotti, Luca Razzoli, Giacomo Guarnieri +3 more·Jul 9, 2026
Nonadiabatic driving in ultrastrongly coupled light--matter systems is commonly regarded as a source of errors, as counter-rotating interactions convert vacuum fluctuations into real excitations through the dynamical Casimir effect (DCE). Here we sho...
Full-Spectrum Quantum Simulation for the Nuclear Shell Model
B. Maheshwari, P. Stevenson, P. Van Isacker·Jul 9, 2026
The nuclear shell model is a general way of expressing the many-body nuclear Hamiltonian and deciphering the underlying nuclear structure. In today's era of modern and high-power computation, the primary limitation of the nuclear shell model is the e...