Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Spectral analysis of the Koopman operator as a framework for recovering Hamiltonian parameters in open quantum systems
Jorge E. Pérez-García, Carlos Colchero, Julio C. Gutiérrez-Vega·Nov 28, 2025
Accurate identification of Hamiltonian parameters is essential for modeling and controlling open quantum systems. In this work, we demonstrate that the multichannel Hankel alternative view of Koopman (mHAVOK) algorithm is a robust and reliable spectr...
Arbitrary control of the temporal waveform of photons during spontaneous emission
Carl Thomas, Rebecca Munk, Boris Blinov·Nov 28, 2025
Control of the temporal waveform of photons produced during spontaneous emission from single quantum emitters provides a crucial tool in the establishment of hybrid quantum systems, optimization of quantum state transfer protocols and mitigation of e...
Random purification channel made simple
Filippo Girardi, Francesco Anna Mele, Ludovico Lami·Nov 28, 2025
The recently introduced random purification channel, which converts $n$ i.i.d. copies of any mixed quantum state into a uniform convex combination of $n$ i.i.d. copies of its purifications, has proved to be an extremely useful tool in quantum learnin...
Quantum Polymorphisms and the Complexity of Quantum Constraint Satisfaction
Lorenzo Ciardo, Gideo Joubert, Antoine Mottet·Nov 28, 2025
We introduce the concept of quantum polymorphisms to the complexity theory of quantum constraint satisfaction. Via this notion, we build an algebraic framework of reductions between quantum CSPs, and we establish a Galois connection between quantum p...
A Heuristic for Matrix Product State Simulation of Out-of-Equilibrium Dynamics of Two-Dimensional Transverse-Field Ising Models
Salvatore Mandrà, Nikita Astrakhantsev, Sergei Isakov +4 more·Nov 28, 2025
Out-of-equilibrium dynamics of non-integrable Hamiltonian many-body quantum systems are characterized by highly entangled wave functions. Near-maximal entanglement arises in systems exhibiting thermalization or pre-thermalization, where the system co...
COMPAS: A Distributed Multi-Party SWAP Test for Parallel Quantum Algorithms
Brayden Goldstein-Gelb, Kun Liu, John M. Martyn +4 more·Nov 28, 2025
The limited number of qubits per chip remains a critical bottleneck in quantum computing, motivating the use of distributed architectures that interconnect multiple quantum processing units (QPUs). However, executing quantum algorithms across distrib...
The Boundary Time Crystal as a light source for quantum enhanced sensing beyond the Heisenberg Limit
Malik Jirasek, Igor Lesanovsky, Albert Cabot·Nov 28, 2025
Modern precision measurements, such as interferometry for detecting gravitational waves, rely on the estimation of optical phases encoded in light fields. Here, we propose to exploit the collectively enhanced output field of a driven-dissipative many...
Quantum Private Distributed Matrix Multiplication With Degree Tables
Mohamed Nomeir, Alptug Aytekin, Lei Hu +1 more·Nov 28, 2025
In this paper, we explore how quantum resources can be used to increase the rate of private distributed matrix multiplication (PDMM). In PDMM, a user who has two high-dimensional matrices, $A$ and $B$, and lacks the computational capabilities to appl...
Persistence of Quantum Triality Relations in Open Qubit and Qutrit Systems
Pratidhwani Swain, Ramita Sarkar, Sukanta K. Tripathy +1 more·Nov 28, 2025
We examine the complementarity among coherence (visibility), predictability, and entanglement for qubit and qutrit systems subjected to noisy quantum channels. Using the system-path entanglement framework, analytical expressions for all three quantit...
Renormalisation of Fermionic Cellular Automata
Lorenzo Siro Trezzini, Andrea Pizzamiglio, Alessandro Bisio +1 more·Nov 28, 2025
We present an exact renormalisation scheme for fermionic cellular automata on hypercubic lattices. By grouping neighbouring cells into tiles and selecting subspaces within them, multiple evolution steps on the original system correspond to a single s...
Hilbert space fragmentation in driven-dephasing Rydberg atom array
Tianyi Yan, Chun Hei Leung, Weibin Li·Nov 28, 2025
We investigate the onset and mechanism of Hilbert space fragmentation (HSF) in a chain of strongly interacting Rydberg atoms subject to local dephasing. It is found that the emergence of multiple long-lived metastable states is fundamentally tied to ...
Bounded-Error Quantum Simulation via Hamiltonian and Lindbladian Learning
Tristan Kraft, Manoj K. Joshi, William Lam +11 more·Nov 28, 2025
Analog Quantum Simulators offer a route to exploring strongly correlated many-body dynamics beyond classical computation, but their predictive power remains limited by the absence of quantitative error estimation. Establishing rigorous uncertainty bo...
Multipartite entanglement features of primordial non-gaussianities
Alessio Belfiglio, Roberto Franzosi, Orlando Luongo·Nov 28, 2025
We discuss some entanglement features associated with cubic non-Gaussian perturbations in single-field inflationary scenarios. We adopt standard momentum-space techniques to show how multipartite entanglement arises for inflationary perturbation mode...
High schoolers excel at Oxford quantum course using pictorial mathematics
Bob Coecke, Aleks Kissinger, Stefano Gogioso +12 more·Nov 28, 2025
We are at the dawn of the second quantum revolution, where our ability to create and control individual quantum systems is poised to drive transformative advancements in basic science, computation, and everyday life. However, quantum theory has long ...
Probing the Fermi Sea Topology in a Quantum Gas
Cyprien Daix, Pok Man Tam, Maxime Dixmerias +5 more·Nov 28, 2025
Pauli's exclusion principle forces fermions to occupy distinct quantum states, creating a filled region of momentum space at low temperature, the Fermi sea, whose topology governs the system's response to perturbations and the nature of its correlati...
Quantum Cubature Codes
Yaoling Yang, Andrew Tanggara, Tobias Haug +1 more·Nov 28, 2025
Bosonic codes utilize the infinite-dimensional Hilbert space of harmonic oscillators to encode quantum information, offering a hardware-efficient approach to quantum error correction. Designing these codes requires precise geometric arrangements of q...
Inhibited radiative decay enhances single-photon emitters
Florian Burger, Stephan Rinner, Andreas Gritsch +2 more·Nov 28, 2025
Quantum networks and the modular scaling of quantum computers require efficient spin-photon interfaces. This can be achieved with optical resonators that increase the local density of states, thereby enhancing the radiative decay of emitters on a spe...
Exchange interaction in gate-defined quantum dots beyond the Hubbard model
Alexander Willmes, Patrick Bethke, M. Mohamed El Kordy Shehata +10 more·Nov 28, 2025
A quantitative description of the exchange interaction in quantum dots is relevant for modeling gate operations of spin qubits. By measuring the amplitude and frequency of exchange-driven qubit state oscillations, we measure the detuning dependence o...
Unrepeated White Rabbit Time Synchronisation over a 300 km Optical Fibre Link
Ben Amies-King, Marco Lucamarini·Nov 28, 2025
White Rabbit (WR) technology provides a commercially-available off-the-shelf solution for time synchronisation with sub-nanosecond accuracy and picosecond-level precision over optical fibre links typically spanning tens of kilometres. Such high-perfo...
A permanent-magnet Zeeman slower and magneto-optical trap for calcium atoms for ultracold Rydberg physics
Eduardo Marin-Bujedo, Julien A. L. Grondin, Thomas Schiltz +3 more·Nov 28, 2025
We report the construction and characterization of an experimental setup for producing a cold gas of $^{40}$Ca atoms and excite them to high Rydberg states with a resonant three-photon-excitation scheme. The apparatus comprises four stages, each desi...