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Entangled photon pairs from radiative cascades in semiconductor quantum dots
Author(s) -
Akopian N.,
Lindner N. H.,
Poem E.,
Berlatzky Y.,
Avron J.,
Gershoni D.,
Gerardot B. D.,
Petroff P. M.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200671523
Subject(s) - physics , quantum dot , quantum entanglement , biexciton , photon , density matrix , photon entanglement , polarization (electrochemistry) , quantum mechanics , cascade , quantum , chemistry , chromatography
Entangled photon pairs are emitted from a biexciton decay cascade of single quantum dots when spectral filtering is applied. We show this by experimentally measuring the density matrix of the polarization state of the photon pair emitted from a continuously pumped quantum dot. The matrix clearly satisfies the Peres criterion for entanglement. By applying in addition a temporal window, the quantum dot becomes an entangled light source. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)