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

Dousse, A.; Suffczyński, J.; Krebs, O.; Beveratos, A.; Lemaître, A.; Sagnes, I.; Bloch, J.; Voisin, P.; Senellart, P.
August 2010
Applied Physics Letters;8/23/2010, Vol. 97 Issue 8, p081104
Academic Journal
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.


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