Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
The fermion sign problem in Gauss law sectors of quantum link models with dynamical matter
Pallabi Dey, Debasish Banerjee, Emilie Huffman·Dec 16, 2025
The fermion sign problem poses a formidable challenge to the use of Monte Carlo methods for lattice gauge theories with dynamical fermionic matter fields. A meron cluster algorithm recently formulated for gauge fields represented as spin-$\frac{1}{2}...
Extreme non-negative Wigner functions
Zacharie Van Herstraeten, Jack Davis, Nuno C. Dias +3 more·Dec 16, 2025
Providing an operational characterization of the Wigner-positive states (WPS), i.e., the set of quantum states with non-negative Wigner function, is a longstanding open problem. For pure states, the only WPS are Gaussian states, but the situation is ...
Strong-to-weak symmetry breaking in monitored dipole conserving quantum circuits
Caterina Zerba, Sarang Gopalakrishnan, Michael Knap·Dec 16, 2025
We explore the information-theoretic phases of monitored quantum circuits subject to dynamics that conserves both charge and dipole moment, as well as measurements of the local charge density. Explicitly, both charge and dipole-moment conservation ar...
Growth and spreading of quantum resources under random circuit dynamics
Sreemayee Aditya, Xhek Turkeshi, Piotr Sierant·Dec 16, 2025
Quantum many-body dynamics generate nonclassical correlations naturally described by quantum resource theories. Quantum magic resources (or nonstabilizerness) capture deviation from classically simulable stabilizer states, while coherence and fermion...
Symmetric Dicke States as Optimal Probes for Wave-Like Dark Matter
Ping He, Jing Shu, Bin Xu +1 more·Dec 16, 2025
We identify symmetric Dicke states as the optimal quantum probes for distributed sensing of wave-like dark-matter fields. Within an ensemble-averaged quantum-metrological framework that incorporates the field's random phases and finite coherence, the...
The entangling power of non-entangling channels
Julien Pinske, Jan Sperling, Klaus Mølmer·Dec 16, 2025
There are processes that cannot generate entanglement but may, nevertheless, amplify entanglement already present in a system. Here, we show that a non-entangling operation can increase the Schmidt number of a quantum state only if it can generate en...
Characterising the sets of quantum states with non-negative Wigner function
Nicolas J. Cerf, Ulysse Chabaud, Jack Davis +3 more·Dec 16, 2025
For Hilbert spaces $\mathcal H\subseteq L^2(\mathbb R)$ we consider the convex sets $\mathcal D_+(\mathcal H)$ of Wigner-positive states (WPS), i.e.~density matrices over $\mathcal H$ with non-negative Wigner function. We investigate the topological ...
Stabilizers may be poor bounds for fidelities
Aaron Z. Goldberg·Dec 16, 2025
The defining feature of ideal Gottesman-Kitaev-Preskill (GKP) states is that they are unchanged by stabilizers, which allow them to detect and correct for common errors without destroying the quantum information encoded in the states. Given this prop...
Dawn and Twilight Time in Quantum Tunneling
Tinglong Feng, Jesse Moes, Tomislav Prokopec·Dec 16, 2025
Metastable decay exhibits a familiar exponential regime bracketed by early-time deviations and late-time power-law tails. We adopt the real-time, flux-based definition of the decay rate in the spirit of Andreassen et al.\ direct method and present a ...
Testing electron-photon exchange-correlation functional performance for many-electron systems under weak and strong light-matter coupling
Iman Ahmadabadi, I-Te Lu, Leonardo A. Cunha +3 more·Dec 16, 2025
We present results of a photon-free exchange-correlation functional within the local density approximation (pxcLDA) for quantum electrodynamics density functional theory (QEDFT) that efficiently describes the electron density of many-electron systems...
Improved Lower Bounds for QAC0
Malvika Raj Joshi, Avishay Tal, Francisca Vasconcelos +1 more·Dec 16, 2025
In this work, we prove the strongest known lower bounds for QAC$^0$, allowing polynomially many gates and ancillae. Our main results show that: (1) Depth-3 QAC$^0$ circuits cannot compute PARITY, and require $Ω(\exp(\sqrt{n}))$ gates to compute MAJOR...
Localization from Infinitesimal Kinetic Grading: Finite-size Scaling, Kibble-Zurek Dynamics and Applications in Sensing
Argha Debnath, Ayan Sahoo, Debraj Rakshit·Dec 16, 2025
We study a one-dimensional lattice model with site-dependent nearest-neighbor hopping amplitudes that follow a power-law profile. The hopping variation is controlled by a grading exponent, $|alpha|$, which serves as the tuning parameter of the system...
Sequential realization of Quantum Instruments
Soham Sau, Michal Sedlák·Dec 16, 2025
In adaptive quantum circuits classical results of mid-circuit measurements determine the upcoming gates. This allows POVMs, quantum channels or more generally quantum instruments to be implemented sequentially, so that fewer qubits need to be used at...
Microwave control of photonic spin Hall effect in atomic system
Muhammad Waseem·Dec 16, 2025
The photonic Spin Hall Effect (SHE) causes a polarization-dependent transverse shift of light at an interface. There is a significant research interest in controlling and enhancing the photonic SHE. In this paper, we theoretically investigate the mic...
Reading Qubits with Sequential Weak Measurements: Limits of Information Extraction
Cesar Lema, Aleix Bou-Comas, Atithi Acharya +2 more·Dec 16, 2025
Quantum information processing and computation requires high accuracy qubit configuration readout. In many practical schemes, the initial qubit configuration has to be inferred from readout that is a time-dependent weak measurement record. However, a...
Exploiting Reset Operations in Cloud-based Quantum Computers to Run Quantum Circuits for Free
Jakub Szefer·Dec 16, 2025
This work presents the first thorough exploration of how reset operations in cloud-based quantum computers could be exploited to run quantum circuits for free. This forms a new type of attack on the economics of cloud-based quantum computers. All maj...
Entanglement measure for the W-class states
Reza Hamzehofi·Dec 16, 2025
The structure and quantification of entanglement in the W-class states are investigated under physically motivated transformations that induce mixed-state dynamics. A rigorous condition is established linking global separability to the behavior of pa...
Fair sampling of ground-state configurations using hybrid quantum-classical MCMC algorithms
Yuichiro Nakano, Keisuke Fujii·Dec 16, 2025
We study the fair sampling properties of hybrid quantum-classical Markov chain Monte Carlo (MCMC) algorithms for combinatorial optimization problems with degenerate ground states. While quantum optimization heuristics such as quantum annealing and th...
Physics-Informed Neural Networks with Adaptive Constraints for Multi-Qubit Quantum Tomography
Changchun Feng, Laifa Tao, Lin Chen·Dec 16, 2025
Quantum state tomography (QST) faces exponential measurement requirements and noise sensitivity in multi-qubit systems, bottlenecking practical quantum technologies. We present a physics-informed neural network (PINN) framework integrating quantum me...
A Graph-Based Forensic Framework for Inferring Hardware Noise of Cloud Quantum Backend
Subrata Das, Archisman Ghosh, Swaroop Ghosh·Dec 16, 2025
Cloud quantum platforms give users access to many backends with different qubit technologies, coupling layouts, and noise levels. The execution of a circuit, however, depends on internal allocation and routing policies that are not observable to the ...