Optimal Phase-Insensitive Force Sensing with Non-Gaussian States
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73632835" target="_blank" >RIV/61989592:15310/25:73632835 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prl/pdf/10.1103/7pyw-tgjd" target="_blank" >https://journals.aps.org/prl/pdf/10.1103/7pyw-tgjd</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/7pyw-tgjd" target="_blank" >10.1103/7pyw-tgjd</a>
Alternative languages
Result language
angličtina
Original language name
Optimal Phase-Insensitive Force Sensing with Non-Gaussian States
Original language description
Quantum metrology enables sensitivity to approach the limits set by fundamental physical laws. Even a single continuous mode offers enhanced precision, with the improvement scaling with its occupation number. Due to their high information capacity, continuous modes allow for the engineering of quantum non-Gaussian states, which not only improve metrological performance but can also be tailored to specific experimental platforms and conditions. Recent advancements in control over continuous platforms operating in the quantum regime have renewed interest in sensing weak forces, also coupling to massive macroscopic objects. In this work, we investigate a force-sensing scheme where a physical process completely randomizes the direction of the induced phase-space displacement, and the unknown force strength is inferred through excitation-number-resolving measurements. We find that 𝑁-spaced states, where only every 𝑁th Fock state occupation is nonzero, approach the achievable sensing bound. Additionally, non-Gaussian states are shown to be more resilient against decoherence than their Gaussian counterparts with the same occupation number. While Fock states typically offer the best protection against decoherence, we uncover a transition in the metrological landscape—revealed through a tailored decoherence-aware Fisher-information-based reward functional—where experimental constraints favor a family of number-squeezed Schrödinger cat states. Specifically, by implementing quantum optimal control in a minimal spin-boson system, we identify these states as maximizing force sensitivity under lossy dynamics and finite system controllability. Our results provide a pathway for enhancing force sensing in a variety of continuous quantum systems, ranging from massive systems like mechanical oscillators to massless systems such as quantum light and microwave resonators.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10306 - Optics (including laser optics and quantum optics)
Result continuities
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)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
PHYSICAL REVIEW LETTERS
ISSN
0031-9007
e-ISSN
1079-7114
Volume of the periodical
135
Issue of the periodical within the volume
23
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
"230802-1"-"230802-11"
UT code for WoS article
001636020700003
EID of the result in the Scopus database
2-s2.0-105023662504