Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Random Stinespring superchannel: converting channel queries into dilation isometry queries
Filippo Girardi, Francesco Anna Mele, Haimeng Zhao +2 more·Dec 23, 2025
The recently introduced random purification channel, which converts $n$ copies of an arbitrary mixed quantum state into $n$ copies of the same uniformly random purification, has emerged as a powerful tool in quantum information theory. Motivated by t...
On super additivity of Fisher information in fully Gaussian metrology
Javier Navarro, Simon Morelli, Mikel Sanz +1 more·Dec 23, 2025
Famously, the quantum Fisher information -- the maximum Fisher information over all physical measurements -- is additive for independent copies of a system and the optimal measurement acts locally. We are left to wonder: does the same hold when the s...
A High-Dimensional Quantum Blockchain Protocol Based on Time- Entanglement
Aktaş, Arzu, Yılmaz +1 more·Dec 23, 2025
Rapid advancements in quantum computing and machine learning threaten the long-term security of classical blockchain systems, whose protection mechanisms largely rely on computational difficulties. In this study, we propose a quantum blockchain proto...
Exploring the nature of gravity with quantum information methods
Bruna Sahdo, Natália Salomé Móller·Dec 23, 2025
The aim of this article is to provide an introduction to the use of quantum information methods for investigating the interface between quantum theory and gravity. To this end, we discuss the basic principles of two current research streams that use ...
Metrologically advantageous states: long-range entanglement and asymmetric error correction
Junjie Chen, Rui Luo, Yuxuan Yan +2 more·Dec 23, 2025
Quantum metrology aims to exploit many-body quantum states to achieve parameter-estimation precision beyond the standard quantum limit. For unitary parameter encoding generated by local Hamiltonians, such enhancement is characterized by superlinear s...
Storage and retrieval of optical skyrmions with topological characteristics
Jinwen Wang, Xin Yang, Yun Chen +10 more·Dec 23, 2025
Optical skyrmions are topological structures of light whose defining property, the skyrmion number, is robust against perturbations. This makes them attractive for applications in quantum information storage, where resilience to decoherence is paramo...
Electrical Drive of a Josephson Junction Array using a Cryogenic BiCMOS Pulse Pattern Generator: Towards a Fully Integrated Josephson Arbitrary Waveform Synthesizer
Yerzhan Kudabay, Oliver Kieler, Michael Starkloff +5 more·Dec 23, 2025
We combine a cryogenic BiCMOS integrated circuit, which generates high-speed return-to-zero (RTZ) pulses, with a superconducting Josephson junction array. The BiCMOS circuit acts as a cryogenic pulse pattern generator, delivering data rates of 30 Gb/...
Finite-Temperature Thermally-Assisted-Occupation Density Functional Theory, Ab Initio Molecular Dynamics, and Quantum Mechanics/Molecular Mechanics Methods
Shaozhi Li, Jeng-Da Chai·Dec 23, 2025
Recently, thermally-assisted-occupation density functional theory (TAO-DFT) [J.-D. Chai, J. Chem. Phys. 136, 154104 (2012)] has been demonstrated to be an efficient and accurate electronic structure method for studying the ground-state properties of ...
Waveguide-integrated colour centres in silicon carbide with broadband photonic crystal reflectors for efficient readout
Marcel Krumrein, Julian M. Bopp, Timo Steidl +5 more·Dec 23, 2025
Spin-active colour centres in 4H silicon carbide are promising candidates as building blocks for quantum information applications. To increase the photon count rate of the emitters at low temperatures, the colour centres must be integrated into nanop...
On the mixed UDA states and additivity
Xinyu Qiu, Lin Chen, Genwei Li +1 more·Dec 23, 2025
Mixed states that are uniquely determined among all (UDA) states are vital in efficient quantum tomography. We show the necessary and sufficient conditions by which some multipartite mixed states are UDA by their $k$-partite reduced density matrices....
Precision Bounds for Characterising Quantum Measurements
Aritra Das, Simon K. Yung, Lorcan O. Conlon +6 more·Dec 23, 2025
Quantum measurements, alongside quantum states and processes, form a cornerstone of quantum information processing. However, unlike states and processes, their efficient characterisation remains relatively unexplored. We resolve this asymmetry by int...
Gate-Based Microwave Quantum Repeater Via Grid-State Encoding
Hany Khalifa, Matti Silveri·Dec 22, 2025
In autonomous quantum error correction the lifetime of a logical bosonic qubit can be extended beyond its physical constituents without feedback measurements. Leveraging autonomous error correction, we propose a second-generation gate-based microwave...
Dissipative quantum algorithms for excited-state quantum chemistry
Hao-En Li, Lin Lin·Dec 22, 2025
Electronic excited states are central to a vast array of physical and chemical phenomena, yet accurate and efficient methods for preparing them on quantum devices remain challenging and comparatively underexplored. We introduce a general dissipative ...
Quantum information scrambling in strongly disordered Rydberg spin systems
Maximilian Müllenbach, Sebastian Geier, Adrian Braemer +5 more·Dec 22, 2025
Despite the fact that power-law interactions occur in a plethora of physical systems, their many-body dynamics is far less understood than that of nearest-neighbor interacting systems. Here, we study information scrambling in strongly disordered spin...
Complexity and Information in Quantum and Classical Trajectories
Hira Ali, Naeem Shahid·Dec 22, 2025
We analyze emission trajectories from a driven-dissipative two-qubit system and a classical telegraph model with matched rates. Using Lempel-Ziv complexity, mutual information, and temporal correlations, we show that both models undergo a transition ...
Towards a point-to-point CV-QKD system: Implementation challenges and perspectives
Davi Juvêncio Gomes de Sousa, Nelson Alves Ferreira Neto, Christiano M. S. Nascimento +7 more·Dec 22, 2025
This article presents an analysis of the practical challenges and implementation perspectives of point-to-point continuous-variable quantum key distribution (CV-QKD) systems over optical fiber. The study addresses the physical layer, including the de...
Local Operations and Field Mediated Entanglement without a Local Tensor Product Structure
Alberto Spalvieri, Sébastien Christophe Garmier, Flaminia Giacomini·Dec 22, 2025
Quantum information has become a powerful tool for probing the structure of quantum field theories, yet its application to gauge theories remains subtle. On the one hand, quantum information theory assumes subsystem locality, i.e.~the factorization o...
Learning transitions of topological surface codes
Finn Eckstein, Bo Han, Simon Trebst +1 more·Dec 22, 2025
For the surface code, topological quantum order allows one to encode logical quantum information in a robust, long-range entangled many-body quantum state. However, if an observer probes this quantum state by performing measurements on the underlying...
Quantum Imaging of Birefringent Samples using Hong-Ou-Mandel Interference
Carolina Gonçalves, Tiago D. Ferreira, Catarina S. Monteiro +1 more·Dec 22, 2025
Two-photon interference in a Hong-Ou-Mandel (HOM) interferometer can be used as a quantum sensing mechanism due to the sensitivity of the interference dip to perturbations of the photon indistinguishability. In particular, recent works have generaliz...
Exponential-to-polynomial scaling of measurement overhead in circuit knitting via quantum tomography
Hiroyuki Harada, Kaito Wada, Naoki Yamamoto +1 more·Dec 22, 2025
Circuit knitting is a family of techniques that enables large quantum computations on limited-size quantum devices by decomposing a target circuit into smaller subcircuits. However, it typically incurs a measurement overhead exponential in the number...