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Coherent dynamics of a telecom-wavelength entangled photon source

Ward, M. B., Dean, M. C., Stevenson, R. M., Bennett, A. J., Ellis, D. J. P., Cooper, K., Farrer, I., Nicoll, C. A., Ritchie, D. A. and Shields, A. J. 2014. Coherent dynamics of a telecom-wavelength entangled photon source. Nature Communications 5 , 3316. 10.1038/ncomms4316

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Quantum networks can interconnect remote quantum information processors, allowing interaction between different architectures and increasing net computational power. Fibre-optic telecommunications technology offers a practical platform for routing weakly interacting photonic qubits, allowing quantum correlations and entanglement to be established between distant nodes. Although entangled photons have been produced at telecommunications wavelengths using spontaneous parametric downconversion in nonlinear media, as system complexity increases their inherent excess photon generation will become limiting. Here we demonstrate entangled photon pair generation from a semiconductor quantum dot at a telecommunications wavelength. Emitted photons are intrinsically anti-bunched and violate Bell’s inequality by 17 standard deviations High-visibility oscillations of the biphoton polarization reveal the time evolution of the emitted state with exceptional clarity, exposing long coherence times. Furthermore, we introduce a method to evaluate the fidelity to a time-evolving Bell state, revealing entanglement between photons emitted up to 5 ns apart, exceeding the exciton lifetime.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Nature Research
ISSN: 2041-1723
Date of Acceptance: 23 January 2014
Last Modified: 03 Dec 2020 14:30

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