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Live trends in quantum computing research, updated daily from arXiv.
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A unified picture of phonon anomalies in crystals and glasses
Alessio Zaccone·Oct 22, 2025
Phonon spectra in solids often display anomalies that defy the simple Debye law, most prominently the van Hove singularity in crystals and the boson peak in glasses. Although traditionally regarded as distinct, both features are increasingly recogniz...
Quantum Coherence in Superconducting Vortex States
Ameya Nambisan, Simon Günzler, Dennis Rieger +13 more·Oct 22, 2025
Abrikosov vortices, where the superconducting gap is completely suppressed in the core, are dissipative, semi-classical entities that impact applications from high-current-density wires to superconducting quantum devices. In contrast, we present evid...
A simplified version of the quantum OTOC$^{(2)}$ problem
Robbie King, Robin Kothari, Ryan Babbush +4 more·Oct 22, 2025
This note presents a simplified version of the OTOC$^{(2)}$ problem that was recently experimentally implemented by Google Quantum AI and collaborators. We present a formulation of the problem for growing input size and hope this spurs further theore...
Explicitly Quantum-parallel Computation by Displacements
Uchenna Chukwu, Mohammad-Ali Miri, Nicholas Chancellor·Oct 22, 2025
We introduce an encoding of information in the relative displacement or photon number of different optical modes. Since the loss rate to interference is insensitive to squeezing and many non-Gaussian fluctuations, such a space is relatively protected...
Entanglement production in the decay of a metastable state
Sergei Khlebnikov·Oct 22, 2025
When a metastable state decays into radiation, there must be entanglement between the radiation and the decaying system, as well as between radiation collected at late and early times. We study the interplay between these two types of entanglement in...
Classical theories of gravity produce entanglement
Joseph Aziz, Richard Howl·Oct 22, 2025
The unification of gravity and quantum mechanics remains one of the most profound open questions in science. With recent advances in quantum technology, an experimental idea first proposed by Richard Feynman is now regarded as a promising route to te...
KARIPAP: Quantum-Inspired Tensor Network Compression of Large Language Models Using Infinite Projected Entangled Pair States and Tensor Renormalization Group
Azree Nazri·Oct 22, 2025
Large Language Models (LLMs) like ChatGPT and LLaMA drive rapid progress in generative AI, yet their huge parameter scales create severe computational and environmental burdens. High training costs, energy use, and limited device deployment hinder ac...
Addressing spins at the clock transitions with a frequency- and bandwidth-tunable superconducting resonator
Yutian Wen, V. Ranjan, T. Lorriaux +5 more·Oct 22, 2025
Solid-state spin ensembles addressed via superconducting circuits are promising candidates for quantum memory applications, offering multimodal storage capability and second-long coherence times at their clock transition. Implementing practical memor...
Universal bound on the Lyapunov spectrum of quantum master equations
Paolo Muratore-Ginanneschi, Gen Kimura, Frederik vom Ende +1 more·Oct 22, 2025
The spectral properties of positive maps are pivotal for understanding the dynamics of quantum systems interacting with their environment. Furthermore, central problems in quantum information such as the characterization of entanglement can be reform...
Heisenberg-Limited Quantum Eigenvalue Estimation for Non-normal Matrices
Yukun Zhang, Yusen Wu, Xiao Yuan·Oct 22, 2025
Estimating the eigenvalues of non-normal matrices is a foundational problem with far-reaching implications, from modeling non-Hermitian quantum systems to analyzing complex fluid dynamics. Yet, this task remains beyond the reach of standard quantum a...
Single-Scale Magnetoelastic Landau Quantization: Thermodynamics, Quantum Oscillations, and Metrology
Denise Assafrão, Faizuddin Ahmed, Edilberto O. Silva·Oct 22, 2025
We develop a unified, single-scale description of thermodynamics and quantum oscillations in electronic systems with a uniform areal density of screw dislocations under a uniform magnetic field. A single tunable gap, $\hbar|ω_{eff}|$ with $ω_{eff}=ω_...
Twisted superconducting quantum diodes: Towards anharmonicity and high fidelity
Han Zhong, Denis Kochan, Igor Zutic +1 more·Oct 22, 2025
As quantum technologies advance, a fundamental challenge is mitigating noise and backscattering in superconducting circuits to achieve scalable, high-fidelity operations. Conventional superconducting components lack directionality, causing energy los...
Zero-field identification and control of hydrogen-related electron-nuclear spin registers in diamond
Alexander Ungar, Hao Tang, Andrew Stasiuk +5 more·Oct 22, 2025
Spin defects in diamond serve as powerful building blocks for quantum technologies, especially for applications in quantum sensing and quantum networking. Electron-nuclear defects formed in the environment of optically active spins, such as the nitro...
Upper bounds on charging power and tangible advantage in quantum batteries
Sreeram PG, J. Bharathi Kannan, M. S. Santhanam·Oct 22, 2025
Quantum battery is expected to outperform its classical counterpart due to quantum effects. Usually, in a quantum battery made of $N$ cells, quantum advantage is demonstrated through super-extensive scaling of the upper bound to the charging power wi...
Quantum computation of molecular geometry via many-body nuclear spin echoes
C. Zhang, R. G. Cortiñas, A. H. Karamlou +320 more·Oct 22, 2025
Quantum-information-inspired experiments in nuclear magnetic resonance spectroscopy may yield a pathway towards determining molecular structure and properties that are otherwise challenging to learn. We measure out-of-time-ordered correlators (OTOCs)...
Revealing the quantum nature of memory in non-Markovian dynamics on IBM Quantum
Charlotte Bäcker, Krishna Palaparthy, Walter T. Strunz·Oct 22, 2025
We investigate memory effects in non-Markovian dynamics on superconducting quantum processors provided by IBM Quantum. We use a collision-model approach to implement suitable single- and two-qubit dynamics with a gate-based quantum circuit. Coupling ...
Fock space fragmentation in quenches of disordered interacting fermions
Ishita Modak, Rajesh Narayanan, Ferdinand Evers +1 more·Oct 22, 2025
Hilbert space fragmentation, as it is currently investigated, primarily originates from specific kinematic constraints or emergent conservation laws in many-body systems with translation invariance. It leads to non-ergodic dynamics and possible break...
On the maximum purity of absolutely separable bipartite states
Hoang Phi Dung, Vu The Khoi·Oct 22, 2025
In this study, we investigate the problem of determining the maximum purity for absolutely separable and absolutely PPT quantum states. From the geometric viewpoint, this problem is equivalent to asking for the exact Euclidean radius of the smallest ...
Quantum Machine Learning methods for Fourier-based distribution estimation with application in option pricing
Fernando Alonso, Álvaro Leitao, Carlos Vázquez·Oct 22, 2025
The ongoing progress in quantum technologies has fueled a sustained exploration of their potential applications across various domains. One particularly promising field is quantitative finance, where a central challenge is the pricing of financial de...
Low overhead circuit cutting with operator backpropagation
Debarthi Pal, Ritajit Majumdar·Oct 22, 2025
Current quantum computers suffer from noise due to lack of error correction. Several techniques to mitigate the effect of noise have been studied, in particular to extract the expectation value of observables. One such technique, circuit cutting, par...