Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution

Pennacchietti, Matteo (författare): Institute for Quantum Computing and Department of Electrical and Computer Engineering, University of Waterloo, N2L 3G1, Waterloo, ON, Canada

Cunard, Brady (författare): Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada

Nahar, Shlok (författare): Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada

Zeeshan, Mohd (författare): National Research Council of Canada, K1A 0R6, Ottawa, ON, Canada

Gangopadhyay, Sayan (författare): Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada

Poole, Philip J. (författare): National Research Council of Canada, K1A 0R6, Ottawa, ON, Canada

Dalacu, Dan (författare): National Research Council of Canada, K1A 0R6, Ottawa, ON, Canada; University of Ottawa, K1N 6N5, Ottawa, ON, Canada

Fognini, Andreas (författare): Single Quantum B.V., 2628 CJ, Delft, The Netherlands

Jöns, Klaus D. (författare): Institute for Photonic Quantum Systems (PhoQS), Center for Optoelectronics and Photonics Paderborn (CeOPP) and Department of Physics, Paderborn University, Warburger Straße 100, 33098, Paderborn, Germany, Warburger Straße 100

Jennewein, Thomas (författare): Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada

Lütkenhaus, Norbert (författare): Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada

Reimer, Michael E. (författare): Institute for Quantum Computing and Department of Electrical and Computer Engineering, University of Waterloo, N2L 3G1, Waterloo, ON, Canada; Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada

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Relaterad länk:: https://doi.org/10.1...; visa fler...; https://urn.kb.se/re...; https://doi.org/10.1...; visa färre...

Abstract Ämnesord

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An on-demand source of bright entangled photon pairs is desirable for quantum key distribution (QKD) and quantum repeaters. The leading candidate to generate such pairs is based on spontaneous parametric down-conversion (SPDC) in non-linear crystals. However, its pair extraction efficiency is limited to 0.1% when operating at near-unity fidelity due to multiphoton emission at high brightness. Quantum dots in photonic nanostructures can in principle overcome this limit, but the devices with high entanglement fidelity (99%) have low pair extraction efficiency (0.01%). Here, we show a measured peak entanglement fidelity of 97.5% ± 0.8% and pair extraction efficiency of 0.65% from an InAsP quantum dot in an InP photonic nanowire waveguide. We show that the generated oscillating two-photon Bell state can establish a secure key for peer-to-peer QKD. Using our time-resolved QKD scheme alleviates the need to remove the quantum dot energy splitting of the intermediate exciton states in the biexciton-exciton cascade.

Av författaren/redakt...: Pennacchietti, M ...; Cunard, Brady; Nahar, Shlok; Zeeshan, Mohd; Gangopadhyay, Sa ...; Poole, Philip J.; visa fler...; Dalacu, Dan; Fognini, Andreas; Jöns, Klaus D.; Zwiller, Val; Jennewein, Thoma ...; Lütkenhaus, Norb ...; Reimer, Michael ...; visa färre...

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