Quantum non-Gaussian coherences of an oscillating atom

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F25%3A00637903" target="_blank" >RIV/68081731:_____/25:00637903 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989592:15310/25:73633241

Výsledek na webu

<a href="https://journals.aps.org/prresearch/abstract/10.1103/5nxx-r97j" target="_blank" >https://journals.aps.org/prresearch/abstract/10.1103/5nxx-r97j</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/5nxx-r97j" target="_blank" >10.1103/5nxx-r97j</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Quantum non-Gaussian coherences of an oscillating atom

Popis výsledku v původním jazyce

Quantum coherence between energy eigenstates of harmonic oscillators is essential for quantum physics. Even the most elementary binary superpositions of the ground and the higher eigenstate are highly required for quantum sensing, thermodynamics, and computing. We derive upper bounds for quantum coherences achieved by classical and Gaussian states and operations and, subsequently, obtain a hierarchy of the thresholds for the off-diagonal elements necessary to reach genuine quantum non-Gaussian coherences. The presented analysis demonstrates that certification based solely on estimation of coherences can cover the quantum non-Gaussian states, which are undetectable by the criteria based solely on the estimation of the corresponding state populations. We experimentally demonstrate the unambiguous observation of quantum non-Gaussian coherences in mechanical vibrations of a single calcium ion up to the superposition of zero and six phonons. The analysis of the robustness with respect to pure dephasing in a motional Ramsey experiment demonstrates the feasibility of their storage for up to more than 20 ms for superpositions with a large energy difference of participating number states. The presented observations prove that atomic oscillations go deeply into a diverse area of discrete quantum non-Gaussian coherent phenomena critical for their applications.

Název v anglickém jazyce

Quantum non-Gaussian coherences of an oscillating atom

Popis výsledku anglicky

Quantum coherence between energy eigenstates of harmonic oscillators is essential for quantum physics. Even the most elementary binary superpositions of the ground and the higher eigenstate are highly required for quantum sensing, thermodynamics, and computing. We derive upper bounds for quantum coherences achieved by classical and Gaussian states and operations and, subsequently, obtain a hierarchy of the thresholds for the off-diagonal elements necessary to reach genuine quantum non-Gaussian coherences. The presented analysis demonstrates that certification based solely on estimation of coherences can cover the quantum non-Gaussian states, which are undetectable by the criteria based solely on the estimation of the corresponding state populations. We experimentally demonstrate the unambiguous observation of quantum non-Gaussian coherences in mechanical vibrations of a single calcium ion up to the superposition of zero and six phonons. The analysis of the robustness with respect to pure dephasing in a motional Ramsey experiment demonstrates the feasibility of their storage for up to more than 20 ms for superpositions with a large energy difference of participating number states. The presented observations prove that atomic oscillations go deeply into a diverse area of discrete quantum non-Gaussian coherent phenomena critical for their applications.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Physical Review Research

ISSN

2643-1564

e-ISSN

2643-1564

Svazek periodika

7

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

033075

Kód UT WoS článku

001537348000005

EID výsledku v databázi Scopus

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