Papers
Live trends in quantum computing research, updated daily from arXiv.
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The Bilateral Efficiency of Ethernet: Recalibrating Metcalfe and Boggs After Fifty Years
Paul Borrill·Mar 19, 2026
In July 1976, Metcalfe and Boggs published their foundational paper on Ethernet in Communications of the ACM. Their efficiency model -- E = (P/C)/(P/C + W*T) -- measures the fraction of Ether time carrying good forward packets under contention. For f...
Understanding Bell locality tests at colliders
J. A. Aguilar-Saavedra, J. A. Casas, J. M. Moreno·Mar 19, 2026
For decades, it has been known that local hidden variable theories cannot be disproved by collider experiments involving decaying particles. However, if these theories satisfy a small set of mild assumptions, they become testable. In particular, they...
Semidefinite block-matrix relaxations for computing quantum correlations
Nicola D'Alessandro, Carles Roch i Carceller, Armin Tavakoli·Mar 19, 2026
Bounding the correlations predicted by quantum theory is an important challenge in quantum information science. Today's leading approach is semidefinite programming relaxations, but existing methods still cannot account for many relevant types of con...
Matrix Product States for Modulated Topological Phases: Crystalline Equivalence Principle and Lieb-Schultz-Mattis Constraints
Shang-Qiang Ning, Hiromi Ebisu, Ho Tat Lam·Mar 19, 2026
Modulated symmetries are internal symmetries that act in a spatially non-uniform manner. Consequently, when a modulated symmetry $G_{\text{int}}$ is combined with a spatial symmetry $G_{\text{sp}}$, the total symmetry group takes the form of a semidi...
Assessing Spatiotemporally Correlated Noise in Superconducting Qubits via Pulse-Based Quantum Noise Spectroscopy
Mayra Amezcua, Leigh Norris, Tom Gilliss +4 more·Mar 19, 2026
Spatiotemporally correlated errors are widespread in quantum devices and are particularly adversarial to error correcting schemes. To characterize these errors, we propose and validate a nonparametric quantum noise spectroscopy (QNS) protocol to esti...
Logarithmic growth of operator entanglement in a clean non-integrable circuit
Mao Tian Tan, Tomaž Prosen·Mar 19, 2026
We study a so-called semi-ergodic brickwork dual-unitary circuits where, in the infinite volume limit, the two-point correlation functions of single-site operators exhibit ergodic behavior along one light ray and non-ergodic behavior along the other ...
Towards a Refinement of Krylov Complexity: Scrambling, Classical Operator Growth and Replicas
Hugo A. Camargo, Yichao Fu, Keun-Young Kim +1 more·Mar 19, 2026
We propose and test logarithmic Krylov (logK) complexity, an operator growth measure akin to Krylov complexity defined through a replica approach, as a viable probe of early-time operator scrambling without false positives. In finite-dimensional quan...
The commutant of fermionic Gaussian unitaries
Paolo Braccia, N. L. Diaz, Martin Larocca +2 more·Mar 19, 2026
In this work, we characterize the $t$-th order commutants of fermionic Gaussian unitaries and of their particle-preserving subgroup acting on $n$ fermionic modes. These commutants govern Haar averages over the corresponding groups and therefore play ...
Quantum theory based on real numbers cannot be experimentally falsified
Timothée Hoffreumon, Mischa P. Woods·Mar 19, 2026
Whether the complex numbers of standard quantum theory are experimentally indispensable has remained open for decades. Real quantum theory (RQT), obtained by replacing complex amplitudes with real ones while retaining the usual Kronecker-product comp...
Measurement-Induced Quantum Neural Network
Paul Argyle, Djamil Lakhdar-Hamina, Sarah H. Miller +1 more·Mar 19, 2026
We introduce a measurement-induced quantum neural network (MINN), an adaptive monitored-circuit architecture in which mid-circuit measurement outcomes determine the entangling gates in subsequent layers. In contrast to standard monitored circuits whe...
Matrix Product States for Modulated Symmetries: SPT, LSM, and Beyond
Amogh Anakru, Sarvesh Srinivasan, Linhao Li +1 more·Mar 19, 2026
Matrix product states (MPS) provide a powerful framework for characterizing one-dimensional symmetry-protected topological (SPT) phases of matter and for formulating Lieb-Schultz-Mattis (LSM)-type constraints. Here we generalize the MPS formalism to ...
Quantum Structures as Generative Scores: Partition Logic, Generative Logic, and Aesthetic Form
Christian Jendreiko, Karl Svozil·Mar 19, 2026
We connect partition logic with Generative Logic by translating finite partition logics into Prolog-based Simple Generative Logic Grammars. As a proof of concept, we use the five-atom V-logic L_{12} to generate a modular visual artifact, the \emph{Qu...
Quantum block encoding for semiseparable matrices
Giacomo Antonioli, Paola Boito, Gianna M. Del Corso +1 more·Mar 19, 2026
Quantum block encoding (QBE) is a crucial step in the development of most quantum algorithms, as it provides an embedding of a given matrix into a suitable larger unitary matrix. Historically, the development of efficient techniques for QBE has mostl...
Low-weight quantum syndrome errors in belief propagation decoding
Haggai Landa·Mar 19, 2026
We describe an empirical approach to identify low-weight combinations of columns of the decoding matrices of a quantum circuit-level noise model, for which belief-propagation (BP) algorithms converge possibly very slowly. Focusing on the logical-idle...
Variational and Annealing-Based Approaches to Quantum Combinatorial Optimization
Hala Hawashin, Deep Nath, Marco Alberto Javarone·Mar 19, 2026
In this work, we review quantum approaches to combinatorial optimization, with the aim of bridging theoretical developments and industrial relevance. We first survey the main families of quantum algorithms, including Quantum Annealing, the Quantum Ap...
Post-Quantum Cryptography from Quantum Stabilizer Decoding
Jonathan Z. Lu, Alexander Poremba, Yihui Quek +1 more·Mar 19, 2026
Post-quantum cryptography currently rests on a small number of hardness assumptions, posing significant risks should any one of them be compromised. This vulnerability motivates the search for new and cryptographically versatile assumptions that make...
Entanglement assisted communication complexity measured by distinguishability
Satyaki Manna, Ankush Pandit, Debashis Saha·Mar 19, 2026
We investigate the quantum advantage that can arise in typical two-party communication scenarios, where the sender and the receiver are allowed to share prior correlations. Focusing on communication tasks constrained by the distinguishability of the ...
Active Quantum Particles from Engineered Dissipation
Jeanne Gipouloux, Matteo Brunelli, Leticia Cugliandolo +2 more·Mar 19, 2026
We introduce and characterize different models for an active quantum particle where activity arises from engineered dissipation-- specifically, from a suitably coupled nonequilibrium environment. These include a model of a particle moving on a lattic...
Probing Coherent Many-Body Spin Dynamics in a Molecular Tweezer Array Quantum Simulator
Yukai Lu, Connor M. Holland, Callum L. Welsh +2 more·Mar 19, 2026
Models of interacting quantum spins are used in many areas of physics ranging from the study of magnetism and strongly correlated materials to quantum sensing. In this work, we study coherent many-body dynamics of interacting spin models realized usi...
Practical Quantum Broadcasting
Ximing Wang, Yunlong Xiao·Mar 19, 2026
Incorporating sample efficiency, by requiring the number of states consumed by broadcasting does not exceed that of a naive prepare-and-distribute strategy, gives rise to the no practical quantum broadcasting theorem. To navigate this limitation, we ...