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Paper detail

Purification of a single photon nonlinearity

We show that the lifetime-reduced fidelity of a semiconductor quantum dot-cavity single photon nonlinearity can be restored by polarization pre- and postselection. This is realized with a polarization degenerate microcavity in the weak coupling regime, where an output polarizer enables quantum interference of the two orthogonally polarized transmission amplitudes. This allows us to transform incident coherent light into a stream of strongly correlated photons with a second-order correlation function of g2(0)~40, larger than previous experimental results even in the strong-coupling regime. This purification technique might also be useful to improve the fidelity of quantum dot based logic gates.

preprint2016arXivOpen access
H. SnijdersJ. A. FreyJ. NormanM. P. BakkerA. GossardJ. E. BowersM. P. van ExterD. BouwmeesterW. Löffler
physics.opticsquant-ph
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H. SnijdersJ. A. FreyJ. NormanM. P. BakkerA. GossardJ. E. BowersM. P. van ExterD. BouwmeesterW. Löffler

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