Titre :

Quadrature coherence scale driven fast decoherence of bosonic quantum field states

Auteur(s) :

Hertz, Anaelle [Auteur]
Laboratoire Paul Painlevé - UMR 8524 [LPP]
De Bievre, Stephan [Auteur]
Laboratoire Paul Painlevé - UMR 8524 [LPP]
Systèmes de particules et systèmes dynamiques [Paradyse]

Titre de la revue :

PHYSICAL REVIEW LETTERS

Éditeur :

American Physical Society

Date de publication :

2020-03-05

ISSN :

0031-9007

Discipline(s) HAL :

Physique [physics]/Physique [physics]/Optique [physics.optics]
Sciences de l'ingénieur [physics]/Optique / photonique

Résumé en anglais : [en]

We introduce, for each state of a bosonic quantum field, its quadrature coherence scale (QCS), a measure of the range of its quadrature coherences. Under coupling to a thermal bath, the purity and QCS are shown to decrease ...
Lire la suite >We introduce, for each state of a bosonic quantum field, its quadrature coherence scale (QCS), a measure of the range of its quadrature coherences. Under coupling to a thermal bath, the purity and QCS are shown to decrease on a time scale inversely proportional to the QCS squared. The states most fragile to decoherence are therefore those with quadrature coherences far from the diagonal. We further show a large QCS is difficult to measure since it induces small scale variations in the state's Wigner function. These two observations imply a large QCS constitutes a mark of "macroscopic coherence". Finally, we link the QCS to optical classicality: optical classical states have a small QCS and a large QCS implies strong optical nonclassicality.Lire moins >

Langue :

Anglais

Vulgarisation :

Non

Projet ANR :

Centre Européen pour les Mathématiques, la Physique et leurs Interactions

Collections :

• Laboratoire Paul Painlevé - UMR 8524

Source :

Harvested from HAL