Quadrature coherence scale driven fast ...
Document type :
Compte-rendu et recension critique d'ouvrage
Title :
Quadrature coherence scale driven fast decoherence of bosonic quantum field states
Author(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]
Laboratoire Paul Painlevé - UMR 8524 [LPP]
De Bievre, Stephan [Auteur]
Laboratoire Paul Painlevé - UMR 8524 [LPP]
Systèmes de particules et systèmes dynamiques [Paradyse]
Journal title :
PHYSICAL REVIEW LETTERS
Publisher :
American Physical Society
Publication date :
2020-03-05
ISSN :
0031-9007
HAL domain(s) :
Physique [physics]/Physique [physics]/Optique [physics.optics]
Sciences de l'ingénieur [physics]/Optique / photonique
Sciences de l'ingénieur [physics]/Optique / photonique
English abstract : [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 ...
Show more >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.Show less >
Show more >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.Show less >
Language :
Anglais
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Non
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