Title :

Interferometric measurement of the quadrature coherence scale using two replicas of a quantum optical state

Author(s) :

Griffet, Célia [Auteur]
Université libre de Bruxelles [ULB]
Arnhem, Matthieu [Auteur]
Université libre de Bruxelles [ULB]
De Bièvre, Stephan [Auteur]
Université de Lille
Laboratoire Paul Painlevé - UMR 8524 [LPP]
Systèmes de particules et systèmes dynamiques [Paradyse]
Cerf, Nicolas [Auteur]
Université libre de Bruxelles [ULB]

Journal title :

Physical Review A

Pages :

023730

Publisher :

American Physical Society

Publication date :

2023-08-31

ISSN :

2469-9926

HAL domain(s) :

Physique [physics]

English abstract : [en]

Assessing whether a quantum state $\hat \rho$ is nonclassical (i.e., incompatible with a mixture of coherent states) is a ubiquitous question in quantum optics, yet a nontrivial experimental task because many nonclassicality ...
Show more >Assessing whether a quantum state $\hat \rho$ is nonclassical (i.e., incompatible with a mixture of coherent states) is a ubiquitous question in quantum optics, yet a nontrivial experimental task because many nonclassicality witnesses are nonlinear in $\hat \rho$. In particular, if we want to witness or measure the nonclassicality of a state by evaluating its quadrature coherence scale, this a priori requires full state tomography. Here, we provide an experimentally friendly procedure for directly accessing this quantity with a simple linear interferometer involving two replicas (independent and identical copies) of the state $\hat \rho$ supplemented with photon number measurements. This finding, that we interpret as an extension of the Hong-Ou-Mandel effect, illustrates the wide applicability of the multicopy interferometric technique in order to circumvent state tomography in quantum optics.Show less >

Language :

Anglais

Popular science :

Non

ANR Project :

Centre Européen pour les Mathématiques, la Physique et leurs Interactions

Comment :

11 pages, 3 figures

Collections :

• Laboratoire Paul Painlevé - UMR 8524

Source :

Harvested from HAL