Properties and applications of the Kirkwood–Dirac distribution

DRM Arvidsson-Shukur, WF Braasch Jr… - New Journal of …, 2024 - iopscience.iop.org
There are several mathematical formulations of quantum mechanics. The Schrödinger
picture expresses quantum states in terms of wavefunctions over, eg position or momentum …

Unifying quantum and classical speed limits on observables

LP García-Pintos, SB Nicholson, JR Green… - Physical Review X, 2022 - APS
The presence of noise or the interaction with an environment can radically change the
dynamics of observables of an otherwise isolated quantum system. We derive a bound on …

Quasiprobabilities in quantum thermodynamics and many-body systems

S Gherardini, G De Chiara - PRX Quantum, 2024 - APS
In this tutorial, we present the definition, interpretation, and properties of some of the main
quasiprobabilities that can describe the statistics of measurement outcomes evaluated at …

Negative quasiprobabilities enhance phase estimation in quantum-optics experiment

N Lupu-Gladstein, YB Yilmaz… - Physical Review Letters, 2022 - APS
Operator noncommutation, a hallmark of quantum theory, limits measurement precision,
according to uncertainty principles. Wielded correctly, though, noncommutation can boost …

Quantifying quantum coherence via Kirkwood-Dirac quasiprobability

A Budiyono, HK Dipojono - Physical Review A, 2023 - APS
Kirkwood-Dirac (KD) quasiprobability is a quantum analog of phase space probability of
classical statistical mechanics, allowing negative or/and nonreal values. It gives an …

Quantum advantage in charging cavity and spin batteries by repeated interactions

R Salvia, M Perarnau-Llobet, G Haack, N Brunner… - Physical Review …, 2023 - APS
Recently, an unconditional advantage has been demonstrated for the process of charging of
a quantum battery in a collisional model [Seah et al., Phys. Rev. Lett. 127, 100601 (2021) …

Thermally driven quantum refrigerator autonomously resets a superconducting qubit

MA Aamir, P Jamet Suria, JA Marín Guzmán… - Nature Physics, 2025 - nature.com
Although classical thermal machines power industries and modern living, quantum thermal
engines have yet to prove their utility. Here, we demonstrate a useful quantum absorption …

Kirkwood-Dirac quasiprobability approach to the statistics of incompatible observables

M Lostaglio, A Belenchia, A Levy… - Quantum, 2023 - quantum-journal.org
Recent work has revealed the central role played by the Kirkwood-Dirac quasiprobability
(KDQ) as a tool to properly account for non-classical features in the context of condensed …

Thermodynamic uncertainty relation in slowly driven quantum heat engines

HJD Miller, MH Mohammady, M Perarnau-Llobet… - Physical review …, 2021 - APS
Thermodynamic uncertainty relations express a trade-off between precision, defined as the
noise-to-signal ratio of a generic current, and the amount of associated entropy production …

Kirkwood-Dirac representations beyond quantum states and their relation to noncontextuality

D Schmid, RD Baldijão, Y Yīng, R Wagner, JH Selby - Physical Review A, 2024 - APS
Kirkwood-Dirac representations of quantum states are increasingly finding use in many
areas within quantum theory. Usually, representations of this sort are only applied to provide …