Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Instance-optimal high-precision shadow tomography with few-copy measurements: A metrological approach
Senrui Chen, Weiyuan Gong, Sisi Zhou·Feb 4, 2026
We study the sample complexity of shadow tomography in the high-precision regime under realistic measurement constraints. Given an unknown $d$-dimensional quantum state $ρ$ and a known set of observables $\{O_i\}_{i=1}^m$, the goal is to estimate exp...
Thermal State Simulation with Pauli and Majorana Propagation
Manuel S. Rudolph, Armando Angrisani, Andrew Wright +3 more·Feb 4, 2026
We introduce a propagation-based approach to thermal state simulation by adapting Pauli and Majorana propagation to imaginary-time evolution in the Schrödinger picture. Our key observation is that high-temperature states can be sparse in the Pauli or...
Requirements for Teleportation in an Intercity Quantum Network
Soubhadra Maiti, Guus Avis, Sounak Kar +1 more·Feb 4, 2026
We investigate the hardware requirements for quantum teleportation in an intercity-scale network topology consisting of two metropolitan-scale networks connected via a long-distance backbone link. Specifically, we identify the minimal improvements re...
Graph-Theoretic Analysis of Phase Optimization Complexity in Variational Wave Functions for Heisenberg Antiferromagnets
Mahmud Ashraf Shamim, Md Moshiur Rahman Raj, Mohamed Hibat-Allah +1 more·Feb 4, 2026
We study the computational complexity of learning the ground state phase structure of Heisenberg antiferromagnets. Representing Hilbert space as a weighted graph, the variational energy defines a weighted XY model that, for $\mathbb{Z}_2$ phases, red...
Digital signatures with classical shadows on near-term quantum computers
Pradeep Niroula, Minzhao Liu, Sivaprasad Omanakuttan +15 more·Feb 4, 2026
Quantum mechanics provides cryptographic primitives whose security is grounded in hardness assumptions independent of those underlying classical cryptography. However, existing proposals require low-noise quantum communication and long-lived quantum ...
Real and momentum space analysis of topological phases in 2D d-wave altermagnets
Manuel Calixto·Feb 4, 2026
Altermagnetism has recently emerged as a third fundamental branch of magnetism, combining the vanishing net magnetization of antiferromagnets with the high-momentum-dependent spin splitting of ferromagnets. This study provides a comprehensive real- a...
Review of Superconducting Qubit Devices and Their Large-Scale Integration
Hiu Yung Wong·Feb 4, 2026
The superconducting qubit quantum computer is one of the most promising quantum computing architectures for large-scale integration due to its maturity and close proximity to the well-established semiconductor manufacturing infrastructure. From an ed...
In models of spontaneous wave-function collapse, why only fermions collapse, not bosons?
Tejinder P. Singh·Feb 4, 2026
Objective collapse models are often implemented so that collapse acts only on the fermionic (matter) sector, while bosonic fields do not undergo fundamental collapse. In generalized trace dynamics (GTD), spontaneous localization is expected to arise ...
Correspondence between classical and quantum resonances
F. J. Arranz, R. M. Benito, F. Borondo·Feb 4, 2026
Bifurcations take place in molecular Hamiltonian nonlinear systems as the excitation energy increases, this leading to the appearance of different classical resonances. In this paper, we study the quantum manifestations of these classical resonances ...
Dynamical Quantum Phase Transitions in Boundary Time Crystals
Sukrut Mondkar, Priya Ghosh, Ujjwal Sen·Feb 4, 2026
We demonstrate the existence of a dynamical quantum phase transition (DQPT) in a dissipative collective-spin model that exhibits the boundary time crystal (BTC) phase. We initialize the system in the ground state of the Hamiltonian in either the BTC ...
Quantifying the Operational Cost of Multipartite Entanglement
Francois Payn, Michele Minervini, Davide Girolami·Feb 4, 2026
Multipartite entanglement determines the strength and range of interactions in many-body quantum systems. Yet, it is hard to evaluate it, due to the complex structures of quantum states. Here, we introduce a generic method to quantify the k <= N-part...
Generalized quantum theory for accessing nonlinear systems: the case of Liénard and Levinson-Smith equations
Bijan Bagchi, Anindya Ghose-Choudhury·Feb 4, 2026
We show that a recently introduced generalized scheme of quantum mechanics has connections to Liénard and Levinson-Smith classes of nonlinear systems. For the Liénard type, which has coefficients of odd and odd symmetry, we demonstrate that closed fo...
Resource-Efficient Digitized Adiabatic Quantum Factorization
Felip Pellicer, Juan José García-Ripoll, Alan C. Santos·Feb 4, 2026
Digitized adiabatic quantum factorization is a hybrid algorithm that exploits the advantage of digitized quantum computers to implement efficient adiabatic algorithms for factorization through gate decompositions of analog evolutions. In this paper, ...
Ising-Induced Spectral Broadening Resolves the Relaxation Bottleneck in Superradiant Masers
Hongze Ding, Jiuqing Liang·Feb 4, 2026
The recent observation of self-induced superradiant masing [[W. Kersten et al., Nat. Phys. 22, 158 (2026)]] revealed a collective relaxation timescale significantly slower than predicted by standard coherent transport models. Here, we elucidate the m...
Enabling large-scale digital quantum simulations with superconducting qubits
Laurin E. Fischer·Feb 4, 2026
Quantum computing promises to revolutionize several scientific and technological domains through fundamentally new ways of processing information. Among its most compelling applications is digital quantum simulation, where quantum computers are used ...
Quantum Advantage in Decision Trees: A Weighted Graph and $L_1$ Norm Approach
Sebastian Alberto Grillo, Bernardo Daniel Dávalos, Rodney Fabian Franco Torres +2 more·Feb 4, 2026
The analysis of the computational power of single-query quantum algorithms is important because they must extract maximal information from one oracle call, revealing fundamental limits of quantum advantage and enabling optimal, resource-efficient qua...
Infinite multiverses and where to find them?
Anubhav Kumar Srivastava, Pavel P. Popov, Guillem Müller-Rigat +1 more·Feb 4, 2026
Have you ever watched superhero movies like Spider-Man: Into the Spider-Verse? Or played games where your choices create different outcomes? What if we told you that in the real world, something even crazier might be happening all the time, right und...
Pre-optimization of quantum circuits, barren plateaus and classical simulability: tensor networks to unlock the variational quantum eigensolver
Baptiste Anselme Martin, Thomas Ayral·Feb 4, 2026
Variational quantum algorithms are practical approaches to prepare ground states, but their potential for quantum advantage remains unclear. Here, we use differentiable 2D tensor networks (TN) to optimize parameterized quantum circuits that prepare t...
Pure narrowband photon-pair generation in a monolithic cavity
Xavier Barcons Planas, Helen M. Chrzanowski, Janik Wolters·Feb 4, 2026
Photonic quantum technologies require efficient sources of pure single photons. Here we present a heralded SPDC single-photon source in a monolithic cavity optimized for high spectral and spatial purity. The source heralds single-photons at a wavelen...
On the emergence of classical stochasticity
Xuan Du Trinh, Ismaël Septembre, Hai-Chau Nguyen·Feb 4, 2026
We examine the logical structure of the emergence of classical stochasticity for a quantum system governed by a Pauli-type master equation. It is well-known that while such equations describe the evolution of probabilities, they do not automatically ...