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Indistinguishable entangled photons generated by a light-emitting diode

Stevenson, R. M., Salter, C. L., Nilsson, J., Bennett, Anthony, Ward, M. B., Farrer, I., Ritchie, D. A. and Shields, A. J. 2012. Indistinguishable entangled photons generated by a light-emitting diode. Physical Review Letters 108 (4) , 040503. 10.1103/PhysRevLett.108.040503

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A linear optical quantum computer relies on interference between photonic qubits for logic, and entanglement for near-deterministic operation. Here we measure the interference and entanglement properties of photons emitted by a quantum dot embedded within a light-emitting diode. We show that pairs of simultaneously generated photons are entangled, and indistinguishable from subsequently generated photons. We measure entanglement fidelity of 0.87 and two-photon-interference visibility of 0.60 ± 0.05. The visibility, limited by detector jitter, could be improved by optical cavity designs.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: American Physical Society
ISSN: 0031-9007
Date of First Compliant Deposit: 23 November 2017
Last Modified: 23 Nov 2017 10:26

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