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Live trends in quantum computing research, updated daily from arXiv.
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Polyhedral Classical Simulators for Quantum Computation
Cihan Okay·Oct 8, 2025
Quantum advantage in computation refers to the existence of computational tasks that can be performed efficiently on a quantum computer but cannot be efficiently simulated on any classical computer. Identifying the precise boundary of efficient class...
On Quantum Computation Using Bias-Preserving Gates
Debadrito Roy, Aryaman Manish Kolhe, V. Lalitha +1 more·Oct 8, 2025
Certain types of quantum computing platforms, such as those realized using Rydberg atoms or Kerr-cat qubits, are natively more susceptible to Pauli-Z noise than Pauli-X noise, or vice versa. On such hardware, it is useful to ensure that computations ...
No exponential quantum speedup for $\mathrm{SIS}^\infty$ anymore
Robin Kothari, Ryan O'Donnell, Kewen Wu·Oct 8, 2025
In 2021, Chen, Liu, and Zhandry presented an efficient quantum algorithm for the average-case $\ell_\infty$-Short Integer Solution ($\mathrm{SIS}^\infty$) problem, in a parameter range outside the normal range of cryptographic interest, but still wit...
Error correction phase transition in noisy random quantum circuits
Jon Nelson, Joel Rajakumar, Michael J. Gullans·Oct 8, 2025
In this work, we study the task of encoding logical information via a noisy quantum circuit. It is known that at superlogarithmic depth, the output of any noisy circuit without reset gates or intermediate measurements becomes indistinguishable from t...
Efficient Radiofrequency Sensing with Fluorescence Encoding
Nicole Voce, Paul Stevenson·Oct 8, 2025
Optically-active spin qubits have emerged as powerful quantum sensors capable of nanoscale magnetometry, yet conventional coherent sensing approaches are ultimately limited by the coherence time of the sensor, typically precluding detection in the su...
The tensor product of p-adic Hilbert spaces
Paolo Aniello, Lorenzo Guglielmi, Stefano Mancini +1 more·Oct 8, 2025
In the framework of quantum mechanics over a quadratic extension of the ultrametric field of p-adic numbers, we introduce a notion of tensor product of p-adic Hilbert spaces. To this end, following a standard approach, we first consider the algebraic...
Dissipative Generation of Currents by Nonreciprocal Local and Global Environments
Catalin-Mihai Halati·Oct 8, 2025
We investigate the mechanisms necessary for the stabilization of complex quantum correlations by exploring dissipative couplings to nonreciprocal reservoirs. We analyze the role of locality in the coupling between the environment and the quantum syst...
3-Local Hamiltonian Problem and Constant Relative Error Quantum Partition Function Approximation: $O(2^{\frac{n}{2}})$ Algorithm Is Nearly Optimal under QSETH
Nai-Hui Chia, Yu-Ching Shen·Oct 8, 2025
We investigate the computational complexity of the Local Hamiltonian (LH) problem and the approximation of the Quantum Partition Function (QPF), two central problems in quantum many-body physics and quantum complexity theory. Both problems are known ...
A quantum state transfer protocol with Ising Hamiltonians
Oscar Michel, Matthias Werner, Arnau Riera·Oct 8, 2025
Quantum state transfer is a fundamental requirement for scalable quantum computation, where fast and reliable communication between distant subsystems is essential. In this work, we present a protocol for quantum state transfer in linear Ising chains...
Simulation of Quantum Repeater Networks under Decoherence and Purification Constraints
Wenhan Li, Shiyu Zhang·Oct 8, 2025
Long-distance quantum communication requires reliable entanglement distribution, but direct generation with protocols such as Barrett--Kok suffers from exponentially decreasing success probability with distance, making it impractical over hundreds of...
Quantum Filtering of Hydrogen Isotopes through Graphene
Joshua Hale, Theja N. De Silva·Oct 8, 2025
Driven by the growing demand in the energy, medical, and industrial sectors, we investigate a hydrogen isotope separation technique that offers both a high separation factor and economic feasibility. Our findings reveal that filtering isotopes throug...
Angular Geometry of Atomic Multipole Transitions
Wesley C. Campbell·Oct 8, 2025
A simple way to calculate Rabi frequencies is outlined for interactions of atomic or nuclear multipole moments with laser fields that focuses on their relative geometry. The resulting expression takes the form of a dot product between the laser polar...
Quantum Filtering and Analysis of Multiplicities in Eigenvalue Spectra
Zhiyan Ding, Lin Lin, Yilun Yang +1 more·Oct 8, 2025
Fine-grained spectral properties of quantum Hamiltonians, including both eigenvalues and their multiplicities, provide useful information for characterizing many-body quantum systems as well as for understanding phenomena such as topological order. E...
Alpha-bit state merging
Jessica Yeh, Jinzhao Wang, Patrick Hayden·Oct 8, 2025
State merging is a fundamental protocol in quantum information theory that generalizes quantum teleportation. Traditionally, it is achieved by local operations on shared entanglement and classical communication. In this work, we study state merging d...
Quantum Grid Path Planning Using Parallel QAOA Circuits Based on Minimum Energy Principle
Jun Liu·Oct 8, 2025
To overcome the bottleneck of classical path planning schemes in solving NP problems and address the predicament faced by current mainstream quantum path planning frameworks in the Noisy Intermediate-Scale Quantum (NISQ) era, this study attempts to c...
Classical-quantum oscillators as diffusive processes in phase space
Emanuele Panella·Oct 8, 2025
The dynamics of hybrid systems -- i.e. ones in which classical and quantum degrees of freedom co-exist and interact -- feature both diffusion in the classical sector and decoherence in the quantum state. In this article, we will consider the simple s...
Spectral properties and coding transitions of Haar-random quantum codes
Grace M. Sommers, J. Alexander Jacoby, Zack Weinstein +2 more·Oct 8, 2025
A quantum error-correcting code with a nonzero error threshold undergoes a mixed-state phase transition when the error rate reaches that threshold. We explore this phase transition for Haar-random quantum codes, in which the logical information is en...
Quantum Resources in Non-Abelian Lattice Gauge Theories: Nonstabilizerness, Multipartite Entanglement, and Fermionic Non-Gaussianity
Gopal Chandra Santra, Julius Mildenberger, Edoardo Ballini +3 more·Oct 8, 2025
Lattice gauge theories (LGTs) represent one of the most ambitious goals of quantum simulation. From a practical implementation perspective, non-Abelian theories present significantly tougher challenges than Abelian LGTs. However, it is unknown whethe...
Quantum simulation of chemistry via quantum fast multipole method
Dominic W. Berry, Kianna Wan, Andrew D. Baczewski +3 more·Oct 8, 2025
Here we describe an approach for simulating quantum chemistry on quantum computers with significantly lower asymptotic complexity than prior work. The approach uses a real-space first-quantised representation of the molecular Hamiltonian which we pro...
Proposals for experimentally realizing (mostly) quantum-autonomous gates
José Antonio Marín Guzmán, Yu-Xin Wang, Tom Manovitz +4 more·Oct 8, 2025
Autonomous quantum machines (AQMs) execute tasks without requiring time-dependent external control. Motivations for AQMs include the restrictions imposed by classical control on quantum machines' coherence times and geometries. Most AQM work is theor...