Indistinguishable entangled photons generated by a light-emitting diode

Stevenson, R. M., Salter, C. L., Nilsson, J., Bennett, Anthony ORCID: https://orcid.org/0000-0002-5386-3710, 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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Abstract

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:	05 May 2023 10:50
URI:	https://orca.cardiff.ac.uk/id/eprint/106835

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