Abstract
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. (C) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original language | English |
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Pages (from-to) | 3900-3904 |
Number of pages | 5 |
Journal | Physica Status Solidi B - Basic Research |
Volume | 243 |
Issue number | 15 |
Early online date | 23 Oct 2006 |
DOIs | |
Publication status | Published - Dec 2006 |