Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Measurement Geometry as a Resource for Certifying Network Nonlocality
Leon Adachi, Le Bin Ho·Jul 6, 2026
Quantum networks can exhibit nonclassical correlations that cannot be explained by classical models with independent sources. While the role of entanglement is well understood, the impact of measurement design remains largely unexplored. Here we deve...
Breaking the One-Dimensional Expressibility-Trainability Tradeoff
Kyoungho Cho, Yu-Seong Jeon, Jinhyoung Lee +1 more·Jul 6, 2026
Expressive parameterized quantum circuits (PQCs) are often designed under a dilemma: the growth of expressibility and entangling power (EP) that improves Hilbert-space coverage is also expected to randomize an ansatz and activate barren-plateau (BP) ...
QuTuner: Feature- and Learning-Guided Optimization Pass Tuning for Quantum Compilers
Ming Zhong, Xiangyu Ren, Jinglei Cheng +2 more·Jul 6, 2026
Quantum compilers play a key role in transforming quantum circuits into lower-cost implementations with improved execution fidelity. This process is commonly guided by circuit-level metrics, such as gate counts and circuit depth. Although compiler pa...
Quantum random walks on d-regular graphs with Haar-random coin operators
Alice C. Quillen·Jul 6, 2026
With unitary coin operator that is a random matrix drawn from a uniform distribution with respect to the Haar measure, we construct a variant of a discrete quantum random walk using a d-regular undirected connected simple graph. With each step of the...
Equiangular weighted frames and conical 2-designs with unequal traces
Katarzyna Siudzińska·Jul 6, 2026
Conical 2-designs are families of positive operators possessing crucial symmetry properties that allow them to efficiently characterize important quantum measures. However, little is known about their general structures and properties. We propose a c...
Security of Quantum Conference Key Agreement with Two-Way Classical Communication
Shun Kawakami, Mori Watanabe, Takuya Ikuta +1 more·Jul 5, 2026
Quantum conference key agreement (QCKA) enables multiple users to establish a common secret key with information-theoretic security and is regarded as a key primitive for secure communication in future quantum networks. However, practical implementat...
Schrodinger Oscillator and its Thermal Properties in a Dynamical Noncommutative Space
Ilyas Haouam·Jul 5, 2026
In this paper, we study the two-dimensional Schrodinger oscillator within a dynamical noncommutative (DNC) space. By leveraging perturbation theory, we derive the energy eigenvalues and eigenvectors and systematically analyze the effects of both dyna...
Trace-to-Hilbert-Schmidt Speed Ratio in Quantum Dynamics: Universal Bounds and Effective Rank
Hossein Rangani Jahromi·Jul 5, 2026
We address the ratio between the trace speed and the Hilbert-Schmidt speed for differentiable finite-dimensional quantum states, $\mathcal R=\|\partial_φρ\|_1/\|\partial_φρ\|_2$. Since the tangent $\partial_φρ$ is Hermitian and traceless, $\mathcal R...
Topological effects in the polarization of the Fulling-Rindler vacuum
A. A. Saharian, G. V. Mirzoyan, V. S. Torosyan·Jul 5, 2026
We investigate how the compactification of some spatial dimensions in Rindler spacetime affects the vacuum expectation values (VEVs) of the field squared and the energy-momentum tensor for a charged scalar field prepared in the Fulling-Rindler vacuum...
Noise-Aware Synthesis of Quantum LDPC Encoder Circuits via Two-Sided Hamming Descent
Aditya Sodhani, Keshab K. Parhi·Jul 5, 2026
Quantum low-density parity-check (LDPC) codes are a promising route to fault-tolerant quantum computation, but their use requires efficient preparation of encoded states. Standard encoder constructions generate circuits through fixed algebraic proced...
Controlling many-body quantum chaos in a dissipative optical cavity
Filippo Ferrari, Francesca Orsi, Ekaterina Fedotova +4 more·Jul 5, 2026
Cavity quantum electrodynamics (QED) with ultracold fermions provides a promising platform for realizing many-body quantum chaos through disordered, photon-mediated long-range interactions. Such setups are inherently open and are therefore subject to...
Deadline-Bound Finite-Object Delivery over Intermittent LEO Satellite Contact Plans under Residual-Service Accounting
Houtianfu Wang, O. Tansel Baydas, Hanlin Cai +2 more·Jul 5, 2026
Low-Earth-orbit (LEO) relay networks deliver finite objects -- sensing tiles, telemetry blocks, model updates, and checkpoints -- over intermittent inter-satellite and space-to-ground contact plans. Partial delivery is insufficient when the complete ...
Topological properties and Majorana Multiplicity in Zigzag Kitaev Chain
Rajiv Kumar, Panch Ram, Levan Chotorlishvili +1 more·Jul 5, 2026
We investigate the spectral and topological properties of a zigzag Kitaev chain constructed from two diagonally coupled one dimensional Kitaev chains with a zero and finite superconducting pairing phase difference. Using a Bogoliubov-de Gennes formul...
Atomic oven with rapid thermal response for atom experiments
Weilong Huang, Congjun Zou, Feiyu Dong +3 more·Jul 5, 2026
Atomic oven generating controllable atomic beam flux plays a fundamental role in quantum gas experiments. Here, we report a new heater design that can heat up an high temperature atomic oven with fast thermal response. The new heater shows a heating ...
Purcell effect and quantum Zeno effect suppressed self-discharging of quantum battery
Da-Wei Liu, Guoqing Tian, Zi-Hao Li +3 more·Jul 5, 2026
Quantum batteries (QB), as an energy storage and transfer device, not only show obvious advantages compared to classical electrochemical batteries, but also have important applications in quantum information. Self-discharging is a central obstacle to...
Supersymmetry and Entanglement in the Generalized Dirac Oscillator
H. P. Laba, V. M. Tkachuk·Jul 5, 2026
The supersymmetric properties of the generalized Dirac oscillator allow us to determine the entanglement entropy between the spin and the continuous variable in a purely algebraic manner. The entanglement has a relativistic origin and disappears in t...
Fundamental limits on state preparation for an open qubit
D. A. Abraamian, L. V. Lokutsievskiy, A. N. Pechen·Jul 5, 2026
We analytically determine the ultimate limits of state preparation in two-level open quantum systems driven by coherent control. For a dissipative qubit governed by a GKSL master equation, we give an exact characterization of the reachable set in the...
Incompatibility assisted Zeno-like confinement enables unbounded sharing of nonlocality
Prerna Rao, Som Kanjilal·Jul 5, 2026
To enable sequential sharing of Bell-nonlocality by an unbounded number of copies, each copy must satisfy two requirements. First, the measurements must be incompatible to extract nonlocality. Second, the post-processsed state, obtained as an equal m...
Optimal estimation of quantum boundary effect in cosmic string space-time
Yao Jin·Jul 5, 2026
The presence of a cosmic string modifies vacuum fluctuations, making the evolution of a two-level polarizable atom position dependent. Such modifications produce effects on the atomic dynamics analogous to those induced by a reflecting boundary. We s...
Chromatic Completeness and the Independence of Geometric Obstruction
Karl Svozil·Jul 5, 2026
We establish a strict logical separation between two distinct phenomena in orthogonality hypergraphs: chromatic completeness, the possibility of assigning a single globally consistent nondegenerate spectrum to all contexts, and geometric coordinatiza...