Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Ultra Compact low cost two mode squeezed light source
Shahar Monsa, Shmuel Sternklar, Eliran Talker·Jan 20, 2026
Quantum-correlated states of light, such as squeezed states, constitute a fundamental resource for quantum technologies, enabling enhanced performance in quantum metrology, quantum information processing, and quantum communications. The practical dep...
Universal composite phase gates with tunable target phase
Peter Chernev, Mouhamad Al-Mahmoud, Andon A. Rangelov·Jan 20, 2026
We present a systematic method for constructing universal composite phase gates with a continuously tunable target phase. Using a general Cayley--Klein parametrization of the single-pulse propagator, we design gates from an even number of nominal $π$...
Bright Heralded Single-Photon Superradiance in a High-Density Thin Vapor Cell
Heewoo Kim, Bojeong Seo, Han Seb Moon·Jan 20, 2026
Superradiance is a hallmark of cooperative quantum emission, where radiative decay is collectively enhanced by coherence among emitters. Here, extending superradiant effects to photon pair generation from multi-level atoms, two-photon process offers ...
Low-Resource Quantum Energy Gap Estimation via Randomization
Hugo Pages, Chusei Kiumi, Yuto Morohoshi +2 more·Jan 20, 2026
Estimating the energy spectra of quantum many-body systems is a fundamental task in quantum physics, with applications ranging from chemistry to condensed matter. Algorithmic shadow spectroscopy is a recent method that leverages randomized measuremen...
On spooky action at a distance and conditional probabilities
Henryk Gzyl·Jan 20, 2026
The aim of this exposé is to make explicit the analogy between the classical notion of non-independent probability distribution and the quantum notion of entangled state. To bring that analogy forth, we consider a classical systems with two dependent...
A phase space approach to the wavefunction spreading and operator growth in the Krylov basis
Kunal Pal, Kuntal Pal, Keun-Young Kim·Jan 20, 2026
In the Wigner-Weyl phase space formulation of quantum mechanics, we analyse the problem of the spreading of an initial state or an initial operator under time evolution when described in terms of the Krylov basis. After constructing the phase space f...
Nonclassical photocounting statistics with a single on-off detector
V. S. Kovtoniuk, M. Bohmann, A. A. Semenov·Jan 20, 2026
Any single on-off photocounter, which can only detect the presence or absence of photons without discriminating their number, is not capable of identifying nonclassical nature of light. This limitation arises because any photocounting statistics obta...
To infinity and back -- $1/N$ graph expansions of light-matter systems
Andreas Schellenberger, Kai P. Schmidt·Jan 20, 2026
We present a method for performing a full graph expansion for light-matter systems, utilizing the linked-cluster theorem. This method enables us to explore $1/N$ corrections to the thermodynamic limit $N\to \infty$ in the number of particles, giving ...
Confinement-Tunable Synthetic Gauge Fields and Floquet Topological Phenomena in a Driven Quantum Wire Qubit
Feulefack Ornela Claire, Dongmo Tedo Lynsia Saychele, Danga Jeremie Edmond +6 more·Jan 20, 2026
Theoretical analysis demonstrates that a spin qubit in a parabolic quantum wire, when driven by a bichromatic field, exhibits a confinement-tunable synthetic gauge field leading to novel Floquet topological phenomena. The underlying mechanism for top...
Dimensional Constraints from SU(2) Representation Theory in Graph-Based Quantum Systems
João P. da Cruz·Jan 20, 2026
We investigate dimensional constraints arising from representation theory when abstract graph edges possess internal degrees of freedom but lack geometric properties. We prove that such internal degrees of freedom can only encode directional informat...
Squeezed-Light-Enhanced Multiparameter Quantum Estimation in Cavity Magnonics
Hamza Harraf, Mohamed Amazioug, Rachid Ahl Laamara·Jan 20, 2026
Improving multiparameter quantum estimation in magnonic systems via quantum noise suppression is a well-established and critical research objective. In this work, we propose an experimentally realistic scheme to improve the precision of simultaneousl...
Quantum simulation of general spin-1/2 Hamiltonians with parity-violating fermionic Gaussian states
Michael Kaicher, Joseph Vovrosh, Alexandre Dauphin +1 more·Jan 20, 2026
We introduce equations of motion for a parity-violating fermionic mean-field theory (PV-FMFT): a numerically efficient fermionic mean-field theory based on parity-violating fermionic Gaussian states (PV-FGS). This work provides explicit equations of ...
Composing $p$-adic qubits: from representations of SO(3)$_p$ to entanglement and universal quantum logic gates
Ilaria Svampa, Sonia L'Innocente, Stefano Mancini +1 more·Jan 20, 2026
In the context of $p$-adic quantum mechanics, we investigate composite systems of $p$-adic qubits and $p$-adically controlled quantum logic gates. We build on the notion of a single $p$-adic qubit as a two-dimensional irreducible representation of th...
Limits of multimode bunching for boson sampling validation: anomalous bunching induced by time delays
Léo Pioge, Leonardo Novo, Nicolas J. Cerf·Jan 20, 2026
The multimode bunching probability is expected to provide a useful criterion for validating boson sampling experiments. Its applicability, however, is challenged by the existence of anomalous bunching, namely paradoxical situations in which partially...
Advances in non-Hermitian dynamics of quadratic bosonic systems
Huawei Zhao, Xinlei Liu, Xinyao Huang +1 more·Jan 20, 2026
Non-Hermitian physics has emerged as a rapidly advancing field of research, revealing a range of novel phenomena and potential applications. Traditional non-Hermitian Hamiltonians are typically simulated by constructing asymmetric couplings or by int...
Evolution of Vortex Strings after a Thermal Quench in a Holographic Superfluid
Chuan-Yin Xia, András Grabarits, Hua-Bi Zeng +1 more·Jan 20, 2026
The formation of topological defects during continuous phase transitions exhibits nonequilibrium universality. While the Kibble-Zurek mechanism (KZM) predicts universal scaling of point-like defect numbers under slow driving, the statistical properti...
Quantum Entanglement Geometry on Severi-Brauer Schemes: Subsystem Reductions of Azumaya Algebras
Kazuki Ikeda·Jan 20, 2026
Quantum entanglement is a defining signature and resource of quantum theory, but its standard definition presupposes a globally fixed decomposition into subsystems. We develop a geometric framework that detects when such a decomposition cannot be glo...
Topological Anderson insulator and reentrant topological transitions in a mosaic trimer lattice
Xiatao Wang, Li Wang, Shu Chen·Jan 20, 2026
We study the topological properties of a one-dimensional quasiperiodic-potential-modulated mosaic trimer lattice. To begin with, we first investigate the topological properties of the model in the clean limit free of quasiperiodic disorder based on a...
On-Chip Generation of Co-Polarized and Spectrally Separable Photon Pairs
Xiaojie Wang, Lin Zhou, Yue Li +10 more·Jan 20, 2026
On-chip generation of high-purity single photons is essential for scalable photonic quantum technologies. Spontaneous parametric down-conversion (SPDC) is widely used to generate photon pairs for heralded single-photon sources, but intrinsic spectral...
Quantum Box-Muller Transform
Dinh-Long Vu, Hitomi Mori, Patrick Rebentrost·Jan 20, 2026
The Box-Muller transform is a widely used method to generate Gaussian samples from uniform samples. Quantum amplitude encoding methods encode the multi-variate normal distribution in the amplitudes of a quantum state. This work presents the Quantum B...