Genuine Quantum Non-Gaussianity and Metrological Sensitivity of Fock States Prepared in a Mechanical Resonator

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73630937" target="_blank" >RIV/61989592:15310/25:73630937 - isvavai.cz</a>

Result on the web

<a href="https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.134.180801" target="_blank" >https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.134.180801</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevLett.134.180801" target="_blank" >10.1103/PhysRevLett.134.180801</a>

Result language

angličtina

Original language name

Genuine Quantum Non-Gaussianity and Metrological Sensitivity of Fock States Prepared in a Mechanical Resonator

Original language description

Fock states of the quantum harmonic oscillator are fundamental to quantum sensing and information processing, serving as key resources for exploiting bosonic degrees of freedom. Here, we prepare high Fock states in a high-overtone bulk acoustic wave resonator by coupling it to a superconducting qubit and applying microwave pulses designed using quantum optimal control. We characterize the experimentally realized states by employing a criterion for genuine quantum non-Gaussianity (QNG) designed to reveal multiphonon contributions. Although energy relaxation and decoherence limit the achievable fidelities, we demonstrate genuine QNG features compatible with a Fock state |6⟩, confirming that the prepared states cannot be generated through Gaussian operations on states with up to Fock state |5⟩ contributions. We further investigate the robustness of these QNG features to losses and their utility in sensing displacement amplitudes. In particular, we introduce a hierarchy based on the quantum Fisher information and show that, despite decoherence and measurement imperfections, the prepared states achieve a displacement sensitivity surpassing that of an ideal Fock state |3⟩. Our results have immediate applications in quantum sensing and simulations with high-overtone bulk acoustic wave resonator devices.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

PHYSICAL REVIEW LETTERS

ISSN

0031-9007

e-ISSN

1079-7114

Volume of the periodical

134

Issue of the periodical within the volume

18

Country of publishing house

US - UNITED STATES

Number of pages

6

Pages from-to

"180801-1"-"180801-6"

UT code for WoS article

001509045600002

EID of the result in the Scopus database

2-s2.0-105004408981