Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Weighted Approximate Quantum Natural Gradient for Variational Quantum Eigensolver
Chenyu Shi, Vedran Dunjko, Hao Wang·Apr 7, 2025
The variational quantum eigensolver (VQE) is one of the most prominent algorithms using near-term quantum devices, designed to find the ground state of a Hamiltonian. In VQE, a classical optimizer iteratively updates the parameters in the quantum cir...
How Far do Lindbladians Go?
Jihong Cai, Advith Govindarajan, Marius Junge·Apr 7, 2025
We study controllability of finite-dimensional open quantum systems under a general Markovian control model combining full coherent (unitary) control with tunable dissipative channels. Assuming the Hamiltonian controls is a Hörmander system that gene...
Markov Gap and Bound Entanglement in Haar Random State
Tian-Ren Jin, Shang Liu, Heng Fan·Apr 7, 2025
Bound entanglement refers to entangled states that cannot be distilled into maximally entangled states and therefore cannot directly be used in many quantum information processing protocols. We identify a relationship between bound entanglement and t...
Unified speed limits in classical and quantum dynamics via temporal Fisher information
Tomohiro Nishiyama, Yoshihiko Hasegawa·Apr 7, 2025
The importance of Fisher information is increasing in nonequilibrium thermodynamics, as it has played a fundamental role in trade-off relations such as thermodynamic uncertainty relations and speed limits. In this work, we investigate temporal Fisher...
Timelike Quantum Energy Teleportation
Kazuki Ikeda·Apr 7, 2025
We establish a novel quantum protocol called Timelike Quantum Energy Teleportation (TQET) between two separated parties $A$ and $B$, designed for transporting quantum energy across spacetime. The amount of energy gained through TQET is always greater...
Quantum Incompatibility in Parallel vs Antiparallel Spins
Ram Krishna Patra, Kunika Agarwal, Biswajit Paul +3 more·Apr 7, 2025
We explore the joint measurability of incompatible qubit observables on ensembles of parallel and antiparallel spin-1/2 pairs. In parallel configuration, both spins are prepared in the same state, whereas in antiparallel case, each spin is paired wit...
Quantum circuits for high-dimensional absolutely maximally entangled states
Berta Casas, Grzegorz Rajchel-Mieldzio'c, Suhail Ahmad Rather +4 more·Apr 7, 2025
Absolutely maximally entangled (AME) states of multipartite quantum systems exhibit maximal entanglement across all possible bipartitions. These states lead to teleportation protocols that surpass standard teleportation schemes, determine quantum err...
Probabilistic imaginary-time evolution in state-vector-based and shot-based simulations and on quantum devices
Satoshi Ejima, K. Seki, B. Fauseweh +1 more·Apr 7, 2025
Imaginary-time evolution, an important technique in tensor network and quantum Monte Carlo algorithms on classical computers, has recently been adapted to quantum computing. In this study, we focus on probabilistic imaginary-time evolution (PITE) alg...
Quantum control of a random transverse Ising spin system
C. Whitty, E. Sherman, Xi Chen +1 more·Apr 7, 2025
We consider subspace transfer within the time-dependent one-dimensional quantum transverse Ising model, with random nearest-neighbor interactions and a transverse field. We run numerical simulations using a variational approach and the numerical GRAP...
Exponential Quantum Speedup for Simulating Classical Lattice Dynamics.
Xiantao Li·Apr 7, 2025
Simulating large-scale lattice dynamics remains a long-standing challenge in condensed matter and materials science, where mechanical and thermal behaviors arise from coupled vibrational modes. We introduce a quantum algorithm that reformulates gener...
Quantum walk with coherent multiple translations induces fast quantum gate operations
Yixi Zhang, Xin Qiao, Luojia Wang +4 more·Apr 7, 2025
Quantum walks with one-dimensional translational symmetry are important for quantum algorithms, where the speed-up of the diffusion speed can be reached if long-range couplings are added. Our work studies a scheme of a ring under the strong resonant ...
Scalable projected entangled-pair state representation of random quantum circuit states
Sungjin Lee, H. Choi, Daniel Donghyon Ohm +1 more·Apr 7, 2025
Classical simulation of a programmable quantum processor is crucial in identifying the threshold of a quantum advantage. We demonstrate the simple update of projected entangled-pair states (PEPSs) in the Vidal gauge that represent random quantum circ...
Radio frequency single electron transmission spectroscopy of a semiconductor Si/SiGe quantum dot
I. Fattal, J. V. Damme, B. Raes +20 more·Apr 7, 2025
Rapid single shot spin readout is a key ingredient for fault tolerant quantum computing with spin qubits. An RF-SET (radio-frequency single electron transistor) is predominantly used as its the readout timescale is far shorter than the spin decoheren...
Notes on Quantum Soundscapes and Music
Miles Blencowe, Michael Casey, Kimberly Tan·Apr 6, 2025
We describe our investigations concerning the sonification of measured data from experiments involving various mesoscopic mechanical oscillator systems cooled down close to their quantum ground states, and music generation from a programmed quantum c...
Impact of Absorption due to Zero-Field Splitting on Loss in Dielectrics: A Case Study in Sapphire
Mark E. Turiansky, Chris G. Van de Walle·Apr 6, 2025
The coherence times of superconducting qubits are limited by loss mechanisms, whose microscopic origins have remained elusive. We propose a mechanism caused by transitions between zero-field-split states of paramagnetic impurities or defects. We deri...
Experimental observation of quantum interferences in CO-H$_2$ rotational energy transfer at room temperature
Hamza Labiad, Alexandre Faure, Ian R. Sims·Apr 6, 2025
Using time-resolved infrared-vacuum-ultraviolet double-resonance spectroscopy, experimental room temperature measurements of state-to-state rate coefficients for rotational energy transfer within the X $^1Σ^+(v=2)$ vibrational state of CO due to H$_2...
Measuring the Oscillation Frequency Beyond the Diffraction Limit
Chao-Ning Hu, Jun Xin, Xiao-Ming Lu·Apr 6, 2025
High-resolution array detectors are widely used in single-particle tracking, but their performance is limited by excess noise from background light and dark current. As pixel resolution increases, the diminished signal per pixel exacerbates susceptib...
Quantum phase classification via partial tomography-based quantum hypothesis testing
Akira Tanji, Hiroshi Yano, Naoki Yamamoto·Apr 5, 2025
Quantum phase classification is a fundamental problem in quantum many-body physics, traditionally approached using order parameters or quantum machine learning techniques such as quantum convolutional neural networks (QCNNs). However, these methods o...
Destruction and recovery of the entanglement entropy of a many-body quantum system after a single measurement
Bo Fan, Can Yin, Antonio M. García-García·Apr 5, 2025
For one-dimensional non-interacting complex fermions, we compute numerically the probability distribution of the change in the entanglement entropy (EE) after saturation, resulting from a single measurement of the occupation number by using different...
Quantum Adaptive Self-Attention for Quantum Transformer Models
Chi-Sheng Chen, En-Jui Kuo·Apr 5, 2025
Integrating quantum computing into deep learning architectures is a promising but poorly understood endeavor: when does a quantum layer actually help, and how much quantum is enough? We address both questions through Quantum Adaptive Self-Attention (...