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Applied Physics Letters / Volume 97 / Issue 8 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 97, 081104 (2010); doi:10.1063/1.3475487 (3 pages)

A quantum dot based bright source of entangled photon pairs operating at 53 K

A. Dousse1, J. Suffczyński1,2, O. Krebs1, A. Beveratos1, A. Lemaître1, I. Sagnes1, J. Bloch1, P. Voisin1, and P. Senellart1

1Laboratoire de Photonique et Nanostructures, LPN/CNRS, Route de Nozay, 91460 Marcoussis, France
2Institute of Experimental Physics, University of Warsaw, 69 Hoza Street, 00-681 Warsaw, Poland

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(Received 8 July 2010; accepted 14 July 2010; published online 23 August 2010)

The exciton and biexciton lines of a single quantum dot are deterministically coupled to the optical modes of a photonic molecule. The resonance between the quantum dot emission lines and the molecule cavity modes is reached at 53 K. The device operates as a very bright source of entangled photon pairs, with an extraction efficiency of 40% for each photon of the pair. Our measurements show that the use of Purcell effect allows to quench the exciton spin relaxation during the radiative cascade, at 53 K and at high excitation power.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

aluminium compounds, biexcitons, Bragg gratings, brightness, gallium arsenide, III-V semiconductors, indium compounds, light sources, microcavities, mirrors, quantum entanglement, quantum optics, semiconductor quantum dots

PACS

  • 42.72.-g

    Optical sources and standards

  • 42.79.Bh

    Lenses, prisms and mirrors

  • 42.79.Dj

    Gratings

  • 42.50.Dv

    Quantum state engineering and measurements

  • 03.65.Ud

    Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.)

  • 03.67.Mn

    Entanglement measures, witnesses, and other characterizations

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.3475487

PUBLICATION DATA

ISSN:

0003-6951 (print)  
1077-3118 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

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