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Live trends in quantum computing research, updated daily from arXiv.
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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...
Is it Gaussian? Testing bosonic quantum states
Filippo Girardi, Freek Witteveen, Francesco Anna Mele +4 more·Oct 8, 2025
Gaussian states are widely regarded as one of the most relevant classes of continuous-variable (CV) quantum states, as they naturally arise in physical systems and play a key role in quantum technologies. This motivates a fundamental question: given ...
Fine-Grained Unambiguous Measurements
Quentin Buzet, André Chailloux·Oct 8, 2025
Unambiguous measurements play an important role in quantum information, with applications ranging from quantum key distribution to quantum state reconstruction. Recently, such measurements have also been used in quantum algorithms based on Regev's re...
Quantum Replica Exchange
Zherui Chen, Joao Basso, Zhiyan Ding +1 more·Oct 8, 2025
The presence of energy barriers in the state space of a physical system can lead to exponentially slow convergence for sampling algorithms like Markov chain Monte Carlo (MCMC). In the classical setting, replica exchange (or parallel tempering) is a p...
End-to-End Quantum Algorithm for Topology Optimization in Structural Mechanics
Leonhard Hölscher, Oliver Ahrend, Lukas Karch +5 more·Oct 8, 2025
Topology optimization is a key methodology in engineering design for finding efficient and robust structures. Due to the enormous size of the design space, evaluating all possible configurations is typically infeasible. In this work, we present an en...
Universal initial state preparation for first quantized quantum simulations
Jack S. Baker, Gaurav Saxena, Thi Ha Kyaw·Oct 8, 2025
Preparing symmetry-adapted initial states is a principal bottleneck in first-quantized quantum simulation. We present a universal approach that efficiently maps any polynomial-size superposition of occupation-number configurations to the first-quanti...
Unified Framework for Direct Characterization of Kraus Operators, Observables, Density Matrices, and Weak Values Without Weak Interaction
Sahil, Sohail·Oct 8, 2025
Generalized quantum measurements, described by positive operator-valued measures (POVMs), are essential for modeling realistic processes in open quantum systems. While quantum process tomography can fully characterize a POVM, it is resource-intensive...
End-to-end quantum algorithms for tensor problems
Enrico Fontana, Sivaprasad Omanakuttan, Junhyung Lyle Kim +4 more·Oct 8, 2025
We present a comprehensive end-to-end quantum algorithm for tensor problems, including tensor PCA and planted kXOR, that achieves potential superquadratic quantum speedups over classical methods. We build upon prior works by Hastings~(\textit{Quantum...
Transversal dimension jump for product qLDPC codes
Christine Li, John Preskill, Qian Xu·Oct 8, 2025
We introduce transversal dimension jump, a code-switching protocol for lifted product (LP) quantum low-density parity-check (qLDPC) codes across different chain-complex dimensions, enabling universal fault-tolerant quantum computation with low overhe...
On quantum to classical comparison for Davies generators
Joao Basso, Shirshendu Ganguly, Alistair Sinclair +3 more·Oct 8, 2025
Despite extensive study, our understanding of quantum Markov chains remains far less complete than that of their classical counterparts. [Temme'13] observed that the Davies Lindbladian, a well-studied model of quantum Markov dynamics, contains an emb...
When quantum resources backfire: Non-gaussianity and symplectic coherence in noisy bosonic circuits
Varun Upreti, Ulysse Chabaud, Zoë Holmes +1 more·Oct 8, 2025
Analyzing the impact of noise is of fundamental importance to understand the advantages provided by quantum systems. While the classical simulability of noisy discrete-variable systems is increasingly well understood, noisy bosonic circuits are more ...
From Quantum Circuits with Ultraslow Dynamics to Classical Plaquette Models
Vikram Ravindranath, Hanchen Liu, Xiao Chen·Oct 8, 2025
We introduce a family of hybrid quantum circuits involving unitary gates and projective measurements that display a measurement-induced phase transition. Remarkably, the volume-law phase featuring logarithmic entanglement growth for certain initial s...
Magic and communication complexity
Uma Girish, Alex May, Natalie Parham +1 more·Oct 8, 2025
We establish novel connections between magic in quantum circuits and communication complexity. In particular, we show that functions computable with low magic have low communication cost. Our first result shows that the $\mathsf{D}\|$ (deterministic ...