Quantum

Quantum has published 2050 Papers in 10 Volumes, as well as 86 Views in Quantum Views.

Policy Update: New editorial onboarding and review procedures

Dear Quantum Community, We wanted to provide an update and announce a new attempt to improve the quality of peer review procedures in Quantum. TL;DR: from now on, instead of …

Paper

Mutually Unbiased Bases in Composite Dimensions – A Review

Daniel McNulty and Stefan Weigert,

Quantum 10, 2051 (2026).

Maximal sets of mutually unbiased bases are useful throughout quantum physics, both in a foundational context and for applications. To date, it remains unknown if complete sets of mutually u…

Paper

Metrologically optimal quantum states under noise

Chao Yin, Victor V. Albert, and Sisi Zhou,

Quantum 10, 2050 (2026).

We propose a class of metrological resource states whose quantum Fisher information scales optimally in both system size and noise rate. In these states, qubits are partitioned into sensing…

Paper

Comparing classical and quantum conditional disclosure of secrets

Uma Girish, Alex May, Leo Orshansky, and Chris Waddell,

Quantum 10, 2049 (2026).

The conditional disclosure of secrets (CDS) setting is among the most basic primitives studied in information-theoretic cryptography. Motivated by a connection to non-local quantum computati…

Paper

Quantum Signal Processing and Quantum Singular Value Transformation on $U(N)$

Xi Lu, Yuan Liu, and Hongwei Lin,

Quantum 10, 2048 (2026).

Quantum signal processing and quantum singular value transformation are powerful tools to implement polynomial transformations of block-encoded matrices on quantum computers, and has achieve…

Paper

The geometry of the Hermitian matrix space and the Schrieffer–Wolff transformation

Gergo Pinter, Gyorgy Frank, Daniel Varjas, and Andras Palyi,

Quantum 10, 2047 (2026).

In quantum mechanics, the Schrieffer–Wolff (SW) transformation (also called quasi-degenerate perturbation theory) is known as an approximative method to reduce the dimension of the Hamiltoni…

Paper

Circuit locality from relativistic locality in scalar field mediated entanglement

Andrea Di Biagio, Richard Howl, Časlav Brukner, Carlo Rovelli, and Marios Christodoulou,

Quantum 10, 2046 (2026).

Locality is a central notion in modern physics, but different disciplines understand it in different ways. Quantum field theory focuses on relativistic locality, based on spacetime regions,…

Paper

Suppressing crosstalk for Rydberg quantum gates

Gina Warttmann, Florian Meinert, Hans Peter Büchler, and Sebastian Weber,

Quantum 10, 2045 (2026).

We present a method to suppress crosstalk from implementing controlled-Z gates via local addressing in neutral atom quantum computers. In these systems, a fraction of the laser light that is…

Paper

Imperfect detectors for adversarial tasks with applications to quantum key distribution

Shlok Nahar, Devashish Tupkary, and Norbert Lütkenhaus,

Quantum 10, 2044 (2026).

Security analyses in quantum key distribution (QKD) and other adversarial quantum tasks often assume perfect device models. However, real-world implementations often deviate from these model…

Paper

CDJ-Pontryagin Optimal Control for General Continuously Monitored Quantum Systems

Tathagata Karmakar and Andrew N. Jordan,

Quantum 10, 2043 (2026).

The Chantasri-Dressel-Jordan (CDJ) stochastic path integral formalism (Chantasri et al. 2013 and 2015) characterizes the statistics of the readouts and the most likely conditional evolution…

Paper

Angular Momentum Entanglement Mediated By General Relativistic Frame Dragging

Trinidad B. Lantaño, Luciano Petruzziello, Susana F. Huelga, and Martin B. Plenio,

Quantum 10, 2042 (2026).

Current proposals to probe the quantum nature of gravity in the low-energy regime predominantly focus on the Newtonian interaction term. In this work, we present a theoretical exploration of…

Paper

Quantum linear system algorithm with optimal queries to initial state preparation

Guang Hao Low and Yuan Su,

Quantum 10, 2041 (2026).

Quantum algorithms for linear systems produce the solution state $A^{-1}|b\rangle$ by querying two oracles: $O_A$ that block encodes the coefficient matrix and $O_b$ that prepares the initial stat…

Paper

Quantum entanglement in phase space

Shuheng Liu, Jiajie Guo, Qiongyi He, and Matteo Fadel,

Quantum 10, 2040 (2026).

While commonly used entanglement criteria for continuous variable systems are based on quadrature measurements, here we study entanglement detection from measurements of the Wigner function.…

Paper

Space-Efficient Quantum Error Reduction without log Factors

Aleksandrs Belovs and Stacey Jeffery,

Quantum 10, 2039 (2026).

Given an algorithm that outputs the correct answer with bounded error, say $1/3$, it is sometimes desirable to reduce this error to some arbitrarily small $\varepsilon$ – e.g., if one wants to c…

Paper

Two-particle scattering on general graphs

Luna Lima Keller and Daniel Jost Brod,

Quantum 10, 2038 (2026).

Quantum walks in general graphs, or more specifically scattering on graphs, encompass enough complexity to perform universal quantum computation. Any given quantum circuit can be broken down…

Paper

A consolidated and accessible security proof for finite-size decoy-state quantum key distribution

Jerome Wiesemann, Jan Krause, Devashish Tupkary, Norbert Lütkenhaus, Davide Rusca, and Nino Walenta,

Quantum 10, 2037 (2026).

In recent years, quantum key distribution (QKD) has evolved from a scientific research field to a commercially available security solution, supported by mathematically formulated security pr…

Paper

The non-stabilizerness of fermionic Gaussian states

Mario Collura, Jacopo De Nardis, Vincenzo Alba, and Guglielmo Lami,

Quantum 10, 2036 (2026).

We introduce an efficient method to quantify nonstabilizerness in fermionic Gaussian states, overcoming the long-standing challenge posed by their extensive entanglement. Using a perfect sam…