Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Group Fourier filtering of quantum resources in quantum phase space
Luke Coffman, N. L. Diaz, Martin Larocca +2 more·Jan 20, 2026
Recently, it has been shown that group Fourier analysis of quantum states, i.e., decomposing them into the irreducible representations (irreps) of a symmetry group, enables new ways to characterize their resourcefulness. Given that quantum phase spac...
Locality forces equal energy spacing of quantum many-body scar towers
Nicholas O'Dea, Lei Gioia, Sanjay Moudgalya +1 more·Jan 20, 2026
Quantum many-body scars are non-thermal eigenstates embedded in the spectra of otherwise non-integrable Hamiltonians. Paradigmatic examples often appear as quasiparticle towers of states, such as the maximally ferromagnetic spin-1/2 states, also know...
Native linear-optical protocol for efficient multivariate trace estimation
Leonardo Novo, Marco Robbio, Ernesto F. Galvão +1 more·Jan 20, 2026
The Hong-Ou-Mandel test estimates the overlap between spectral functions characterizing the internal degrees of freedom of two single photons. It can be viewed as a photon-native protocol that implements the well-known quantum SWAP test. Here, we pro...
A generating-function approach to the interference of squeezed states with partial distinguishability
Matheus Eiji Ohno Bezerra, Valery Shchesnovich·Jan 20, 2026
Photon distinguishability is a fundamental property manifested in multiphoton interference and one of the main sources of noise in any photonic quantum information processing. In this work, rather than relying on first-quantization methods, we build ...
Device-independent quantum memory certification in two-point measurement experiments
Leonardo S. V. Santos, Peter Tirler, Michael Meth +6 more·Jan 20, 2026
Quantum memories are key components of emerging quantum technologies. They are designed to store quantum states and retrieve them on demand without losing features such as superposition and entanglement. Verifying that a memory preserves these featur...
Localizable Entanglement as an Order Parameter for Measurement-Induced Phase Transitions
Sourav Manna, Arul Lakshminarayan, Vaibhav Madhok·Jan 20, 2026
We identify localizable entanglement (LE) as an order parameter for measurement-induced phase transitions (MIPT). LE exhibits universal finite-size scaling with critical exponents that match previous MIPT results and gives a nice operational interpre...
Sharp Inequalities for Schur-Convex Functionals of Partial Traces over Unitary Orbits
Pablo Costa Rico, Pavel Shteyner·Jan 20, 2026
While many bounds have been proved for partial trace inequalities over the last decades for a large variety of quantities, recent problems in quantum information theory demand sharper bounds. In this work, we study optimal bounds for partial trace qu...
Information transport and transport-induced entanglement in open fermion chains
Andrea Nava, Claudia Artiaco, Yuval Gefen +4 more·Jan 20, 2026
Understanding the entanglement dynamics in quantum many-body systems under steady-state transport conditions is an actively pursued challenging topic. Hydrodynamic equations, akin to transport equations for charge or heat, would be of great interest ...
The $O(n\to\infty)$ Rotor Model and the Quantum Spherical Model on Graphs
Nikita Titov, Andrea Trombettoni·Jan 20, 2026
We show that the large $n$ limit of the $O(n)$ quantum rotor model defined on a general graph has the same critical behavior as the corresponding quantum spherical model and that the critical exponents depend solely on the spectral dimension $d_s$ of...
Integrity from Algebraic Manipulation Detection in Trusted-Repeater QKD Networks
Ailsa Robertson, Christian Schaffner, Sebastian R. Verschoor·Jan 20, 2026
Quantum Key Distribution (QKD) allows secure communication without relying on computational assumptions, but can currently only be deployed over relatively short distances due to hardware constraints. To extend QKD over long distances, networks of tr...
Quantum Pontus-Mpemba Effect Enabled by the Liouvillian Skin Effect
Stefano Longhi·Jan 20, 2026
We unveil a quantum Pontus-Mpemba effect enabled by the Liouvillian skin effect in a dissipative tight-binding chain with asymmetric incoherent hopping and coherent boundary coupling. The skin effect, induced by non-reciprocal dissipation, localizes ...
Generalised contextuality of continuous variable quantum theory can be revealed with a single projective measurement
Pauli Jokinen, Mirjam Weilenmann, Martin Plávala +3 more·Jan 20, 2026
Generalized contextuality is a possible indicator of non-classical behaviour in quantum information theory. In finite-dimensional systems, this is justified by the fact that noncontextual theories can be embedded into some simplex, i.e. into a classi...
Variational Quantum Circuit-Based Reinforcement Learning for Dynamic Portfolio Optimization
Vincent Gurgul, Ying Chen, Stefan Lessmann·Jan 20, 2026
This paper presents a Quantum Reinforcement Learning (QRL) solution to the dynamic portfolio optimization problem based on Variational Quantum Circuits. The implemented QRL approaches are quantum analogues of the classical neural-network-based Deep D...
Performance enhancing of hybrid quantum-classical Benders approach for MILP optimization
Sergio López-Baños, Elisabeth Lobe, Ontje Lünsdorf +1 more·Jan 20, 2026
Mixed-integer linear programming problems are extensively used in industry for a wide range of optimization tasks. However, as they get larger, they present computational challenges for classical solvers within practical time limits. Quantum annealer...
The rate of purification of quantum trajectories
Maël Bompais, Nina H. Amini, Juan P. Garrahan +1 more·Jan 20, 2026
We investigate the behavior of quantum trajectories conditioned on measurement outcomes. Under a condition related to the absence of so-called dark subspaces, Kümmerer and Maassen had shown that such trajectories almost surely purify in the long run....
Tripartite quantum correlations obtained by post-selection from twin beams
Pavel Pavlicek, Jan Perina, Vaclav Michalek +2 more·Jan 20, 2026
Spatially-resolved photon counting of a twin beam performed by an iCCD camera allows for versatile tailoring the properties of the beams formed by parts of the original twin beam. Dividing the idler beam of the twin beam into three equally-intense pa...
Optimal Construction of Two-Qubit Gates using the Symmetries of B Gate Equivalence Class
M. Karthick Selvan, S. Balakrishnan·Jan 20, 2026
Two applications of gates from the B gate equivalence class can generate all two-qubit gates. This local equivalence class is invariant under the mirror (multiplication with the SWAP gate) operation, inverse (Hermitian conjugate) operation, and the c...
Experimental Evidence-Based Sub-Rayleigh Source Discrimination
Saurabh U. Shringarpure, Yong Siah Teo, Hyunseok Jeong +5 more·Jan 20, 2026
We propose a Bayesian evidence-based inference framework based on relative belief ratios and apply it to discriminating between one and two incoherent optical point sources using spatial-mode demultiplexing (SPADE). Unlike the Helstrom measurement, S...
A Converse Bound via the Nussbaum-Szkoła Mapping for Quantum Hypothesis Testing
Jorge Lizarribar-Carrillo, Gonzalo Vazquez-Vilar, Tobias Koch·Jan 20, 2026
Quantum hypothesis testing concerns the discrimination between quantum states. This paper introduces a novel lower bound for asymmetric quantum hypothesis testing that is based on the Nussbaum-Szkoła mapping. The lower bound provides a unified recove...
Tensor Network Assisted Distributed Variational Quantum Algorithm for Large Scale Combinatorial Optimization Problem
Yuhan Huang, Siyuan Jin, Yichi Zhang +3 more·Jan 20, 2026
Although quantum computing holds promise for solving Combinatorial Optimization Problems (COPs), the limited qubit capacity of NISQ hardware makes large-scale instances intractable. Conventional methods attempt to bridge this gap through decompositio...