Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Classical capacities under physical constraints: More capacity with less entanglement
Sudipta Mondal, Pritam Halder, Saptarshi Roy +1 more·Apr 30, 2025
Current advancements in communication equipment demand the investigation of classical information transfer over quantum channels, by encompassing realistic scenarios in finite dimensions. To address this issue, we develop a framework for analyzing cl...
Spatiotemporal entanglement of the vacuum
Pravin Kumar Dahal, Kieran Hymas·Apr 30, 2025
We demonstrate that the future and left Rindler wedges of Minkowski spacetime are entangled, leading to the Unruh effect. Similarly, the past and right Rindler wedges are also entangled. We propose a protocol to extract this entanglement using two tw...
Semiclassical Approach to Quantum Fisher Information
Mahdi RouhbakhshNabati, Daniel Braun, Henning Schomerus·Apr 30, 2025
Quantum sensors driven into the quantum chaotic regime can have dramatically enhanced sensitivity, which, however, depends intricately on the details of the underlying classical phase space. Here, we develop an accurate semiclassical approach that pr...
Language Model for Large-Text Transmission in Noisy Quantum Communications
Yuqi Li, Zhou Shi, Haitao Ma +3 more·Apr 29, 2025
Quantum communication has the potential to revolutionize information processing, providing unparalleled security and increased capacity compared to its classical counterpart by using the principles of quantum mechanics. However, the presence of noise...
Multimode Entangled Squeezed Light Generation and Propagation in a Coupled-Cavity Photonic Crystal
Dylan van Eeden, Marc M. Dignam·Apr 28, 2025
Entangled multi-mode squeezed states of light have a wide variety of applications in quantum information systems, particularly in the generation of non-Gaussian states of light, which are central to continuous-variable quantum computing. Although the...
Estimating decoding graphs and hypergraphs of memory QEC experiments
E. Takou, Kenneth R. Brown·Apr 28, 2025
Characterizing the error sources of quantum devices is essential for building reliable large-scale quantum architectures and tailoring error correction codes to the noise profile of the devices. Tomography techniques can provide detailed information ...
Precision polarization tuning for light shift mitigation in trapped-ion qubits
Hengchao Tu, Chunyang Luan, Menglin Zou +3 more·Apr 28, 2025
Trapped-ion qubits are among the most promising candidates for quantum computing, quantum information processing, and quantum simulation. In general, trapped ions are considered to have sufficiently long coherence times, which are mainly characterize...
On-chip calibrated radio-frequency measurement at cryogenic temperatures for determination of SrTiO3-based capacitor properties
Akitomi Shirachi, M. Shinozaki, Yasuhide Tomioka +7 more·Apr 28, 2025
Quantum computing has emerged as a promising technology for next-generation information processing, utilizing semiconductor quantum dots as one of the candidates for quantum bits. Radio-frequency (rf) reflectometry plays an important role in the read...
Universal low-depth two-unitary design of programmable photonic circuits
S. A. Fldzhyan, M. Yu. Saygin, S. S. Straupe·Apr 27, 2025
The development of large-scale, programmable photonic circuits capable of performing generic matrix-vector multiplication is essential for both classical and quantum information processing. However, this goal is hindered by high losses, hardware erro...
A correspondence between the Rabi model and an Ising model with long-range interactions
Bruno Scheihing-Hitschfeld, Néstor Sepúlveda·Apr 27, 2025
By means of Trotter's formula, we show that transition amplitudes between a class of generalized coherent states in the Rabi model can be understood in terms of a certain Ising model featuring long-range interactions beyond nearest neighbors in its t...
Simulation of a rapid qubit readout dependent on the transmission of a single fluxon
Waltraut Wustmann, Kevin D. Osborn·Apr 26, 2025
The readout speed of qubits is a major limitation for error correction in quantum information science. We show simulations of a proposed device that gives readout of a fluxonium qubit using a ballistic fluxon with an estimated readout time of less th...
Preparing Greenberger-Horne-Zeilinger states on ground levels of neutral atoms
Zhu-yao Jin, Jun Jing·Apr 25, 2025
We propose a scalable protocol in the Rydberg atomic system to generate the Greenberger-Horne-Zeilinger (GHZ) states, where the qubits are encoded on the hyperfine ground levels. Our system is featured with off-resonant driving fields rather than str...
Classical Estimation of the Free Energy and Quantum Gibbs Sampling from the Markov Entropy Decomposition
Samuel O. Scalet, Angela Capel, Anirban N. Chowdhury +4 more·Apr 24, 2025
We revisit the Markov Entropy Decomposition, a classical convex relaxation algorithm introduced by Poulin and Hastings to approximate the free energy in quantum spin lattices. We identify a sufficient condition for its convergence, namely the decay o...
Selectively Blind Quantum Computation
Abbas Poshtvan, Oleksandra Lapiha, Mina Doosti +3 more·Apr 24, 2025
Known protocols for secure delegation of quantum computations from a client to a server in an information theoretic setting require quantum communication. In this work, we investigate methods to reduce communication overhead. First, we establish an i...
Computing‐Heightened Low‐Cost High‐Dimensional Controlled‐SUM Gates
Zhi‐Guo Fan, Zhuo‐Ya Bai, Qiu‐lin Tan +1 more·Apr 24, 2025
Qudit‐based quantum gates offer several advantages over qubit‐based counterparts, such as higher information density, the ability to address more complex problems, and richer quantum operations. In this study, three realistic protocols are presented ...
Public-Key Quantum Fire and Key-Fire From Classical Oracles
Alper Çakan, Vipul Goyal, Omri Shmueli·Apr 23, 2025
Quantum fire is a distribution of quantum states that can be efficiently cloned, but cannot be efficiently converted into a classical string. First considered by Nehoran and Zhandry (ITCS'24) and later formalized by Bostanci, Nehoran, Zhandry (STOC'2...
Resource Reduction in Multiparty Quantum Secret Sharing of both Classical and Quantum Information under Noisy Scenario
Nirupam Basak, Goutam Paul·Apr 23, 2025
Quantum secret sharing (QSS) enables secure distribution of information among multiple parties but remains vulnerable to noise. We analyze the effects of bit-flip, phase-flip, and amplitude damping noise on the multiparty QSS for classical message (Q...
Surface-code Superconducting Quantum Processors: From Calibration To Logical Performance
Hany Ali·Apr 23, 2025
Current quantum processors are fragile, noisy and fairly limited in both quantity and quality with tens of qubits and physical error rates of around 10^-3. To realize practical quantum applications, however, error rates need to be below 10^-15 across...
Preconditioning Natural and Second Order Gradient Descent in Quantum Optimization: A Performance Benchmark
Th'eo Lisart-Liebermann, Arcesio Castaneda Medina·Apr 23, 2025
The optimization of parametric quantum circuits is technically hindered by three major obstacles: the non-convex nature of the objective function, noisy gradient evaluations, and the presence of barren plateaus. As a result, the selection of classica...
Beating the break-even point with autonomous quantum error correction
Yi Li, Qingyuan Mei, Qing-Xuan Jie +13 more·Apr 23, 2025
Quantum error correction (QEC) is essential for practical quantum computing, as it protects fragile quantum information from errors by encoding it in high-dimensional Hilbert spaces. Conventional QEC protocols typically require repeated syndrome meas...