Quantum

Quantum has published 2260 Papers in 10 Volumes, as well as 87 Views in Quantum Views.

Single-shot preparation of hypergraph product codes via dimension jump

Yifan Hong,

Quantum 9, 1879 (2025).

Quantum error correction is a fundamental primitive of fault-tolerant quantum computing. But in order for error correction to proceed, one must first prepare the codespace of the underlying…

Paper

Certifying quantum enhancements in thermal machines beyond the Thermodynamic Uncertainty Relation

José A. Almanza-Marrero and Gonzalo Manzano,

Quantum 9, 1878 (2025).

Quantum coherence has been shown to impact the operational capabilities of quantum systems performing thermodynamic tasks in a significant way, and yet the possibility and conditions for gen…

Paper

Quantum channel coding: Approximation algorithms and strong converse exponents

Aadil Oufkir and Mario Berta,

Quantum 9, 1877 (2025).

We study relaxations of entanglement-assisted quantum channel coding and establish that non-signaling assistance and a natural semi-definite programming relaxation — termed meta-converse — a…

Paper

Quantum Lego and XP Stabilizer Codes

Ruohan Shen, Yixu Wang, and ChunJun Cao,

Quantum 9, 1876 (2025).

We apply the recent graphical framework of "Quantum Lego" to XP stabilizer codes where the stabilizer group is generally non-Abelian. We show that the idea of operator matching continues to…

Paper

Knot invariants and indefinite causal order

Samuel Fedida, Anne-Catherine de la Hamette, Viktoria Kabel, and Časlav Brukner,

Quantum 9, 1875 (2025).

We explore indefinite causal order between events in the context of quasiclassical spacetimes in superposition. We introduce several new quantifiers to measure the degree of indefiniteness o…

Paper

Monitored quantum transport: full counting statistics of a quantum Hall interferometer

C.W.J. Beenakker and Jin-Fu Chen,

Quantum 9, 1874 (2025).

We generalize the Levitov-Lesovik formula for the probability distribution function of the electron charge transferred through a phase coherent conductor, to include projective measurements…

Paper

Backpropagation scaling in parameterised quantum circuits

Joseph Bowles, David Wierichs, and Chae-Yeun Park,

Quantum 9, 1873 (2025).

The discovery of the backpropagation algorithm ranks among one of the most important moments in the history of machine learning, and has made possible the training of large-scale neural netw…

Paper

Meson dynamics from locally exciting a particle-conserving $Z_2$ lattice gauge theory

Vaibhav Sharma and Kaden R. A. Hazzard,

Quantum 9, 1872 (2025).

Quantum simulation of lattice gauge theories is an important avenue to gain insights into both particle physics phenomena and constrained quantum many-body dynamics. There is a growing inter…

Paper

Symmetry resolved out-of-time-order correlators of Heisenberg spin chains using projected matrix product operators

Martina Gisti, David J. Luitz, and Maxime Debertolis,

Quantum 9, 1871 (2025).

We extend the concept of operator charge in the context of an abelian $U(1)$ symmetry and apply this framework to symmetry-preserving matrix product operators (MPOs), enabling the description…

Paper

Estimating the entanglement of random multipartite quantum states

Khurshed P. Fitter, Cécilia Lancien, and Ion Nechita,

Quantum 9, 1870 (2025).

Genuine multipartite entanglement of a given multipartite pure quantum state can be quantified through its geometric measure of entanglement, which, up to logarithms, is simply the maximum o…

Paper

On High-Dimensional Twin-Field Quantum Key Distribution

Ronny Mueller, Mujtaba Zahidy, Leif Katsuo Oxenløwe, Søren Forchhammer, and Davide Bacco,

Quantum 9, 1869 (2025).

Twin-Field Quantum Key Distribution (QKD) is a QKD protocol that uses single-photon interference to perform QKD over long distances. QKD protocols that encode information using high-dimensio…

Paper

Potential renormalisation, Lamb shift and mean-force Gibbs state – to shift or not to shift?

Luis A. Correa and Jonas Glatthard,

Quantum 9, 1868 (2025).

Often, the microscopic interaction mechanism of an open quantum system gives rise to a `counter term' which renormalises the system Hamiltonian. Such term compensates for the distortion of t…

Paper

Holevo Cramér-Rao bound: How close can we get without entangling measurements?

Aritra Das, Lorcán O. Conlon, Jun Suzuki, Simon K. Yung, Ping K. Lam, and Syed M. Assad,

Quantum 9, 1867 (2025).

In multi-parameter quantum metrology, the resource of entanglement can lead to an increase in efficiency of the estimation process. Entanglement can be used in the state preparation stage, o…

Paper

QuantumToolbox.jl: An efficient Julia framework for simulating open quantum systems

Alberto Mercurio, Yi-Te Huang, Li-Xun Cai, Yueh-Nan Chen, Vincenzo Savona, and Franco Nori,

Quantum 9, 1866 (2025).

We present $\tt{QuantumToolbox.jl}$, an open-source Julia package for simulating open quantum systems. Designed with a syntax familiar to users of $\tt{QuTiP}$ (Quantum Toolbox in Python), it ha…

Paper

Sequency Hierarchy Truncation (SeqHT) for Adiabatic State Preparation and Time Evolution in Quantum Simulations

Zhiyao Li, Dorota M. Grabowska, and Martin J. Savage,

Quantum 9, 1865 (2025).

We introduce the Sequency Hierarchy Truncation (SeqHT) scheme for reducing the resources required for state preparation and time evolution in quantum simulations, based upon a truncation in…

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[Update: This has been solved!] Dear Quantum community, We are aware that Google Scholar has recently stopped indexing Quantum publications. We have identified the cause of the problem, and …