Observation of strongly entangled photon pairs from a nanowire quantum dot

Marijn A. M. Versteegh (), Michael E. Reimer, Klaus D. Jöns, Dan Dalacu, Philip J. Poole, Angelo Gulinatti, Andrea Giudice and Val Zwiller
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Marijn A. M. Versteegh: Quantum Transport, Kavli Institute of Nanoscience, Delft University of Technology
Michael E. Reimer: Quantum Transport, Kavli Institute of Nanoscience, Delft University of Technology
Klaus D. Jöns: Quantum Transport, Kavli Institute of Nanoscience, Delft University of Technology
Dan Dalacu: National Research Council of Canada
Philip J. Poole: National Research Council of Canada
Angelo Gulinatti: Politecnico di Milano
Andrea Giudice: Micro Photon Devices
Val Zwiller: Quantum Transport, Kavli Institute of Nanoscience, Delft University of Technology

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

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms6298

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