Papers
Live trends in quantum computing research, updated daily from arXiv.
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Quantum Integrability of Hamiltonians with Time-Dependent Interaction Strengths and the Renormalization Group Flow
Parameshwar R. Pasnoori·Dec 15, 2025
In this paper we consider quantum Hamiltonians with time-dependent interaction strengths, and following the recently formulated generalized Bethe ansatz framework [P. R. Pasnoori, Phys. Rev. B 112, L060409 (2025)], we show that constraints imposed by...
Quantum channel tomography and estimation by local test
Kean Chen, Nengkun Yu, Zhicheng Zhang·Dec 15, 2025
We study the estimation of an unknown quantum channel $\mathcal{E}$ with input dimension $d_1$, output dimension $d_2$ and Kraus rank at most $r$. We establish a connection between the query complexities in two models: (i) access to $\mathcal{E}$, an...
Optimised Fermion-Qubit Encodings for Quantum Simulation with Reduced Transpiled Circuit Depth
Michael Williams de la Bastida, Thomas M. Bickley, Peter V. Coveney·Dec 15, 2025
Simulation of fermionic Hamiltonians with gate-based quantum computers requires the selection of an encoding from fermionic operators to quantum gates, the most widely used being the Jordan-Wigner transform. Many alternative encodings exist, with qua...
Three-qubit entangling gates with simultaneous exchange controls in spin qubit systems
Miguel G. Rodriguez, Yun-Pil Shim·Dec 15, 2025
Pairwise exchange couplings have long been the standard mechanism for entangling spin qubits in semiconductor systems. However, implementing quantum circuits based on pairwise exchange gates often requires a lengthy sequence of elementary gate operat...
Quantum Resource Analysis of Low-Round Keccak/SHA-3 Preimage Attack: From Classical 2^57.8 to Quantum 2^28.9 using Qiskit Modeling
Ramin Rezvani Gilkolae·Dec 15, 2025
This paper presents a hardware-conscious analysis of the quantum acceleration of the classical 3-round Keccak-256 preimage attack using Grover's Algorithm. While the theoretical quantum speed-up from T_cl=2^{57.8} (classical) to T_qu = 2^{28.9} (quan...
Pontryagin Maximum Principle for Rydberg-blockaded state-to-state transfers: A semi-analytic approach
Federico Alberto Astolfi, Sven Jandura, Guido Pupillo·Dec 15, 2025
We study time-optimal state-to-state control for two- and multi-qubit operations motivated by neutral-atom quantum processors within the Rydberg blockade regime. Block-diagonalization of the Hamiltonian simplifies the dynamics and enables the applica...
Tensor Network Formulation of Dequantized Algorithms for Ground State Energy Estimation
Hidetaka Manabe, Takanori Sugimoto, Keisuke Fujii·Dec 15, 2025
Verifying quantum advantage for practical problems, particularly the ground state energy estimation (GSEE) problem, is one of the central challenges in quantum computing theory. For that purpose, dequantization algorithms play a central role in provi...
Multi-Photon Lasing Phenomena in Quantum Dot-Cavity QED
Lavakumar Addepalli·Dec 15, 2025
Multi-photon lasing has been realized in systems with strong nonlinear interactions between emitters and cavity modes, where single-photon processes are suppressed. Coherence between the internal states of a quantum emitter, or among multiple emitter...
Unraveling the Quantum Mpemba Effect on Markovian Open Quantum Systems
Rodrigo F. Saliba, Raphael C. Drumond·Dec 15, 2025
In recent years, the quantum Mpemba effect (QME), which occurs when an out-of-equilibrium system reaches equilibrium faster than another that is closer to equilibrium, has attracted significant attention from the scientific community as an intriguing...
Arrival Time -- Classical Parameter or Quantum Operator?
MohammadJavad Kazemi, MohammadHossein Barati, Ghadir Jafari +2 more·Dec 15, 2025
The question of how to interpret and compute arrival-time distributions in quantum mechanics remains unsettled, reflecting the longstanding tension between treating time as a quantum observable or as a classical parameter. Most previous studies have ...
Wigner function negativity in a classical model of quantum light
Brian R. La Cour·Dec 15, 2025
The presence of negative values in the Wigner quasiprobability distribution is deemed one of the hallmarks of nonclassical phenomena in quantum systems. Here we demonstrate a classical model of squeezed light that, when combined with post-selection o...
Gibbs state postulate from dynamical stability -- Redundancy of the zeroth law
Vjosa Blakaj, Matthias C. Caro, Anouar Kouraich +2 more·Dec 15, 2025
Gibbs states play a central role in quantum statistical mechanics as the standard description of thermal equilibrium. Traditionally, their use is justified either by a heuristic, a posteriori reasoning, or by derivations based on notions of typicalit...
Phase Space Electronic Structure Theory: From Diatomic Lambda-Doubling to Macroscopic Einstein-de Haas
Linqing Peng, Tian Qiu, Nadine Bradbury +5 more·Dec 15, 2025
$Λ$-doubling of diatomic molecules is a subtle microscopic phenomenon that has long attracted the attention of experimental groups, insofar as rotation of molecular $\textit{nuclei}$ induces small energetic changes in the (degenerate) $\textit{electr...
Decoding 3D color codes with boundaries
Friederike Butt, Lars Esser, Markus Müller·Dec 15, 2025
Practical large-scale quantum computation requires both efficient error correction and robust implementation of logical operations. Three-dimensional (3D) color codes are a promising candidate for fault-tolerant quantum computation due to their trans...
Gate-Tunable Giant Negative Magnetoresistance in Tellurene Driven by Quantum Geometry
Marcello B. Silva Neto, Chang Niu, Marcus V. O. Moutinho +5 more·Dec 15, 2025
Negative magnetoresistance in conventional two-dimensional electron gases is a well-known phenomenon, but its origin in complex and topological materials, especially those endowed with quantum geometry, remains largely elusive. Here, we report the di...
Riemannian gradient descent-based quantum algorithms for ground state preparation with guarantees
Mahum Pervez, Ariq Haqq, Nathan A. McMahon +1 more·Dec 15, 2025
We investigate Riemannian gradient flows for preparing ground states of a desired Hamiltonian on a quantum device. We show that the number of steps of the corresponding Riemannian gradient descent (RGD) algorithm that prepares a ground state to a giv...
Quantum Chaos as an Essential Resource for Full Quantum State Controllability
Lukas Beringer, Mathias Steinhuber, Klaus Richter +1 more·Dec 15, 2025
Using the key properties of chaos, i.e. ergodicity and exponential instability, as a resource to control classical dynamics has a long and considerable history. However, in the context of controlling "chaotic" quantum unitary dynamics, the situation ...
Fundamental bound on entanglement generation between interacting Rydberg atoms
Georgios Doultsinos, Antonis Delakouras, David Petrosyan·Dec 15, 2025
We analytically derive the fundamental lower bound for the preparation fidelity of a maximally-entangled (Bell) state of two atoms involving Rydberg-state interactions. This bound represents the minimum achievable error $E \geq ( 1 + π/2 ) Γ/B$ due t...
Impact of Information on Quantum Heat Engines
Lindsay Bassman Oftelie, Michele Campisi·Dec 15, 2025
The emerging field of quantum thermodynamics is beginning to reveal the intriguing role that information can play in quantum thermal engines. Information enters as a resource when considering feedback-controlled thermal machines. While both a general...
Achievable Trade-Off in Network Nonlocality Sharing
Ming-Xiao Li, Yuqi Li, Rui-Bin Xu +4 more·Dec 15, 2025
Quantum networks are essential for advancing scalable quantum information processing. Quantum nonlocality sharing provides a crucial strategy for the resource-efficient recycling of quantum correlations, offering a promising pathway toward scaling qu...