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Research in Optical Sciences

Two Photon Interference from Semiconductor Quantum Dots

Christian Schneider, Peter Gold, Alexander Thoma, Sebastian Maier, Stephan Reitzenstein, Sven Höfling, Martin Kamp

Published Jan 1, 2014• 0 citations
Publisher

Abstract

We study the interference properties of single photons emitted from semiconductor quantum dots (QDs). The influence of the excitation conditions, as well as the nature of the QD-source (same dot or separate dots) is assessed, and we provide a consistent model to describe the data quantitatively.
DOI
10.1364/qim.2014.qw3b.7

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We demonstrate interference between discrete photons emitted by two different semiconductor quantum dots and quantify their degree of indistinguishability. The quantum dot emission energies are tuned into resonance by straining the samples. Upon interference on a beamsplitter, the photons are shown to be 18.1% indistinguishable, resulting in a coincidence detection rate below the classical limit. Post-selecting only those detections occurring within a short time of each other increases the measured indistinguishability to 47%. The photons are partially distinguishable due to dephasing of the exciton states, and post-selection is also affected by the detector response time.