Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Effects: Entanglement and Decoherence I

Q 2.3: Vortrag

Montag, 23. März 2015, 12:00–12:15, B/gHS

Quantum-entangled light from localized emitters — •Peter Grünwald and Werner Vogel — Institut für Physik, Universität Rostock, D-18055 Rostock, Germany

Quantum entanglement as a nonclassical phenomenon is a key feature in both quantum optics and quantum information [1]. The relation between nonclassicality in general and quantum entanglement in particular is a major topic of research and many questions remain unanswered until now.

We consider a localized radiation source, for which we study the relation between nonclassical light and quantum entanglement of the radiation emitted in different directions [2]. If the state of light is nonclassical, the state of the light fields emitted in two directions is also entangled, cf. [3,4]. We also conclude that nonclassicality occuring in higher-order moments implies genuine multipartite entanglement of the fields emitted in multiple directions, cf. [5]. Furthermore, the method directly provides witnesses to verify the quantum entanglement. Our approach may also be extended to describe space-time dependent quantum correlations [6].

Referenzen

[1] R. Horodecki et. al., Rev. Mod. Phys. 81, 865 (2009).

[2] P. Grünwald and W. Vogel, Phys. Rev. A 90, 022334 (2014).

[3] E. V. Shchukin and W. Vogel, Phys. Rev. A 72, 043808 (2005).

[4] E. Shchukin and W. Vogel, Phys. Rev. Lett. 95, 230502 (2005).

[5] E. Shchukin and W. Vogel, Phys. Rev. A 74, 030302(R) (2006).

[6] W. Vogel, Phys. Rev. Lett. 100, 013605 (2008).