An entangled two photon source using biexciton emission of an asymmetric quantum dot in a cavity

Details An entangled two photon source using biexciton emission of an asymmetric quantum dot in a cavity An entangled two photon source using biexciton emission of an asymmetric quantum dot in a cavity

2002-11-29

arxiv.org/abs/cond-mat/0211689v1

PRB 67 085317, 2003

Physics

Condensed Matter

16 pages, 10 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.67.085317

A semiconductor based scheme has been proposed for generating entangled photon pairs from the radiative decay of an electrically-pumped biexciton in a quantum dot. Symmetric dots produce polarisation entanglement, but experimentally-realised asymmetric dots produce photons entangled in both polarisation and frequency. In this work, we investigate the possibility of erasing the `which-path' information contained in the frequencies of the photons produced by asymmetric quantum dots to recover polarisation-entangled photons. We consider a biexciton with non-degenerate intermediate excitonic states in a leaky optical cavity with pairs of degenerate cavity modes close to the non-degenerate exciton transition frequencies. An open quantum system approach is used to compute the polarisation entanglement of the two-photon state after it escapes from the cavity, measured by the visibility of two-photon interference fringes. We explicitly relate the two-photon visibility to the degree of Bell-inequality violation, deriving a threshold at which Bell-inequality violations will be observed. Our results show that an ideal cavity will produce maximally polarisation-entangled photon pairs, and even a non-ideal cavity will produce partially entangled photon pairs capable of violating a Bell-inequality.

Affiliated with

Also associated with

No associations

Rating

An entangled two photon source using biexciton emission of an asymmetric quantum dot in a cavity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with An entangled two photon source using biexciton emission of an asymmetric quantum dot in a cavity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An entangled two photon source using biexciton emission of an asymmetric quantum dot in a cavity will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-91427