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Live trends in quantum computing research, updated daily from arXiv.
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Operational protocols cannot certify classicality
Chris Fields, James F. Glazebrook, Antonino Marcianò +1 more·Oct 9, 2025
The existence and practical utility of operational protocols that certify entanglement raises the question of whether operational protocols exist that certify the absence of entanglement, i.e. that certify separability. We show, within a purely topol...
Enhancing optomechanical force sensing utilizing synthetic magnetism
Ding-hui Xu, Zheng Liu, Chang-shui Yu·Oct 9, 2025
In precision force sensing of multi-mechanical mode optomechanical systems, coherent interference can decouple certain degenerate vibrational modes from the cavity field, leading to incomplete information regarding the measured signal. In this paper,...
Neural PDE Solvers with Physics Constraints: A Comparative Study of PINNs, DRM, and WANs
Jiakang Chen·Oct 9, 2025
Partial differential equations (PDEs) underpin models across science and engineering, yet analytical solutions are atypical and classical mesh-based solvers can be costly in high dimensions. This dissertation presents a unified comparison of three me...
Hyper-optimized Quantum Lego Contraction Schedules
Balint Pato, June Vanlerberghe, Kenneth R. Brown·Oct 9, 2025
Calculating the quantum weight enumerator polynomial (WEP) is a valuable tool for characterizing quantum error-correcting (QEC) codes, but it is computationally hard for large or complex codes. The Quantum LEGO (QL) framework provides a tensor networ...
Generalised fractional Rabi problem
Alexander Lopez, Sébastien Fumeron, Malte Henkel +2 more·Oct 9, 2025
Fractional quantum dynamics provides a natural framework to capture nonlocal temporal behavior and memory effects in quantum systems. In this work, we analyze the physical consequences of fractional-order quantum evolution using a Green's function fo...
Quantum Agents for Algorithmic Discovery
Iordanis Kerenidis, El-Amine Cherrat·Oct 9, 2025
We introduce quantum agents trained by episodic, reward-based reinforcement learning to autonomously rediscover several seminal quantum algorithms and protocols. In particular, our agents learn: efficient logarithmic-depth quantum circuits for the Qu...
Characterizing Liouvillian Exceptional Points Through Newton Polygons and Tropical Geometry
Sayooj P, Awadhesh Narayan·Oct 9, 2025
The dynamics of open quantum systems described by the Lindblad master equation follows according to non-Hermitian operators. As a result, such systems can host non-Hermitian degeneracies called Liouvillian exceptional points (EPs). In this work, we s...
Efficient Fidelity Estimation with Few Local Pauli Measurements
Mingyu Sun, Gabriel Waite, Michael Bremner +1 more·Oct 9, 2025
As quantum devices scale, quantifying how close an experimental state aligns with a target becomes both vital and challenging. Fidelity is the standard metric, but existing estimators either require full tomography or apply only to restricted state/m...
Classification and implementation of unitary-equivariant and permutation-invariant quantum channels
Laura Mančinska, Elias Theil·Oct 9, 2025
Many quantum information tasks use inputs of the form $ρ^{\otimes m}$, which naturally induce permutation and unitary symmetries. We classify all quantum channels that respect both symmetries - i.e. unitary-equivariant and permutation-invariant quant...
Pattern or Not? QAOA Parameter Heuristics and Potentials of Parsimony
Vincent Eichenseher, Maja Franz, Christian Wolff +1 more·Oct 9, 2025
Structured variational quantum algorithms such as the Quantum Approximate Optimisation Algorithm (QAOA) have emerged as leading candidates for exploiting advantages of near-term quantum hardware. They interlace classical computation, in particular op...
Enhancing Hybrid Methods in Parameterized Quantum Circuit Optimization
Joona V. Pankkonen, Matti Raasakka, Andrea Marchesin +1 more·Oct 9, 2025
Parameterized quantum circuits (PQCs) play an essential role in the application of variational quantum algorithms (VQAs) in noisy intermediate-scale quantum (NISQ) devices. The PQCs are a leading candidate to achieve a quantum advantage in NISQ devic...
Existence of universal resource and uselessness of too entangled states for quantum metrology
Rina Miyajima, Yuki Takeuchi, Seiseki Akibue·Oct 9, 2025
We show (i) the existence of universal resource states for a certain class of linear Hamiltonians and (ii) the uselessness of highly entangled states for quantum metrology of linear Hamiltonians. We also show that random pure states are basically not...
Adaptive Quantum Homeopathy
Lennart Bittel, Lorenzo Leone·Oct 9, 2025
Randomness is a fundamental resource in quantum information, with crucial applications in cryptography, algorithms, and error correction. A central challenge is to construct unitary $k$-designs that closely approximate Haar-random unitaries while min...
Three-dimensional optical characterization of magnetostrictive deformation in magnomechanical systems
Xiaomin Liu, Jing Zhang, Jie Li +3 more·Oct 9, 2025
Magnomechanical systems with YIG spheres have been proven to be an ideal system for studying magnomechanically induced transparency, dynamical backaction, and rich nonlinear effects, such as the magnon-phonon cross-Kerr effect. Accurate characterizat...
Quantum Algorithm for Low Energy Effective Hamiltonian and Quasi-Degenerate Eigenvalue Problem
Chun-Tse Li, Tzen Ong, Chih-Yun Lin +3 more·Oct 9, 2025
Quasi-degenerate eigenvalue problems are central to quantum chemistry and condensed-matter physics, where low-energy spectra often form manifolds of nearly degenerate states that determine physical properties. Standard quantum algorithms, such as pha...
Faraday patterns, spin textures, spin-spin correlations and competing instabilities in a driven spin-1 antiferromagnetic Bose-Einstein condensate
Vaishakh Kargudri, Sandra M. Jose, Rejish Nath·Oct 9, 2025
We study the formation of transient Faraday patterns and spin textures in driven quasi-one-dimensional and quasi-two-dimensional spin-1 Bose-Einstein condensates under the periodic modulation of $s$-wave scattering lengths $a_0$ and $a_2$, starting f...
On the modeling of irreversibility by relaxator Liouville dynamics
Janos Hajdu, Martin Janßen·Oct 9, 2025
A general approach to modeling irreversibility starting from microscopic reversibility is presented. The time $t_s$ up to which relevant degrees of freedom of a system are tracked is extremely much shorter than the spectral resolution time $t_e$ that...
A Unified Approach to Quantum Key Leasing with a Classical Lessor
Fuyuki Kitagawa, Jiahui Liu, Shota Yamada +1 more·Oct 9, 2025
Secure key leasing allows a cryptographic key to be leased as a quantum state in such a way that the key can later be revoked in a verifiable manner. In this work, we propose a modular framework for constructing secure key leasing with a classical-le...
An infinite hierarchy of multi-copy quantum learning tasks
Jan Nöller, Viet T. Tran, Mariami Gachechiladze +1 more·Oct 9, 2025
Learning properties of quantum states from measurement data is a fundamental challenge in quantum information. The sample complexity of such tasks depends crucially on the measurement primitive. While shadow tomography achieves sample-efficient learn...
Optimization of Quadratic Constraints by Decoded Quantum Interferometry
Daniel Cohen Hillel·Oct 9, 2025
A recent paper by Jordan et al. introduced Decoded Quantum Interferometry (DQI), a novel quantum algorithm that uses the quantum Fourier transform to reduce linear optimization problems -- max-XORSAT and max-LINSAT -- to decoding problems. In this pa...