Print Email Facebook Twitter Observation of strongly entangled photon pairs from a nanowire quantum dot Title Observation of strongly entangled photon pairs from a nanowire quantum dot Author Versteegh, M.A. Reimer, M.E. Jöns, K.D. Dalacu, D. Poole, P.J. Gulinatti, A. Giudice, A. Zwiller, V. Faculty Applied Sciences Department QN/Quantum Nanoscience Date 2014-10-31 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. To reference this document use: http://resolver.tudelft.nl/uuid:e3a02181-003d-476e-bd8d-3e8f0a065a24 DOI https://doi.org/10.1038/ncomms6298 Publisher Nature Publishing Group ISSN 2041-1723 Source Nature Communications, 5, 2014 Part of collection Institutional Repository Document type journal article Rights (c) 2014 CC - BY This work is licensed under a Creative Commons Attribution 4.0 International License Files PDF Reimer_2014.pdf 1.33 MB Close viewer /islandora/object/uuid:e3a02181-003d-476e-bd8d-3e8f0a065a24/datastream/OBJ/view