Coherent dynamics of a telecom-wavelength entangled photon source

M.B. Ward, M.C. Dean, R.M. Stevenson, A.J. Bennett, D.J.P. Ellis, K. Cooper, I. Farrer, C.A. Nicoll, D.A. Ritchie and A.J. Shields ()
Additional contact information
M.B. Ward: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Cambridge Science Park
M.C. Dean: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Cambridge Science Park
R.M. Stevenson: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Cambridge Science Park
A.J. Bennett: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Cambridge Science Park
D.J.P. Ellis: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Cambridge Science Park
K. Cooper: Cavendish Laboratory, University of Cambridge
I. Farrer: Cavendish Laboratory, University of Cambridge
C.A. Nicoll: Cavendish Laboratory, University of Cambridge
D.A. Ritchie: Cavendish Laboratory, University of Cambridge
A.J. Shields: Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Cambridge Science Park

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract 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.

Date: 2014
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DOI: 10.1038/ncomms4316

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