Observation of strongly entangled photon pairs from a nanowire quantum dot

Abstract

A bright photon source that combines high-fidelity entanglement, on-demand generation, high extraction efficiency, directional and coherent emission, as well as position control at the nanoscale is required for implementing ambitious schemes in quantum information processing, such as that of a quantum repeater. Still, all of these properties have not yet been achieved in a single device. Semiconductor quantum dots embedded in nanowire waveguides potentially satisfy all of these requirements; however, although theoretically predicted, entanglement has not yet been demonstrated for a nanowire quantum dot. Here, we demonstrate a bright and coherent source of strongly entangled photon pairs from a position controlled nanowire quantum dot with a fidelity as high as 0.859 +/- 0.006 and concurrence of 0.80 +/- 0.02. The two-photon quantum state is modified via the nanowire shape. Our new nanoscale entangled photon source can be integrated at desired positions in a quantum photonic circuit, single electron devices and light emitting diodes.

Article and Supplementary Information with open access published at: http://www.nature.com/ncomms/2014/141031/ncomms6298/full/ncomms6298.html

References in corpus (8)

• Silica-on-Silicon Waveguide Quantum Circuits
• Entangled Photon Pairs from Semiconductor Quantum Dots
• A wavelength-tunable fiber-coupled source of narrowband entangled photons
• Bright single-photon sources in bottom-up tailored nanowires
• Improved fidelity of triggered entangled photons from single quantum dots
• Evolution of entanglement within classical light states
• Growth and optical properties of axial hybrid III-V/Si nanowires
• Highly entangled photons from hybrid piezoelectric-semiconductor quantum dot devices

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