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

Matteo Pennacchietti; Brady Cunard; Shlok Nahar; Mohd Zeeshan; Sayan Gangopadhyay; Dan Dalacu; Philip J. Poole; Andreas Fognini; Klaus Jöns; Val Zwiller; Thomas Jennewein; Norbert Lütkenhaus; Michael E. Reimer

doi:10.1117/12.3029474

16 August 2024 Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution

Matteo Pennacchietti, Brady Cunard, Shlok Nahar, Mohd Zeeshan, Sayan Gangopadhyay, Dan Dalacu, Philip J. Poole, Andreas Fognini, Klaus Jöns, Val Zwiller, Thomas Jennewein, Norbert Lütkenhaus, Michael E. Reimer

Author Affiliations +

Proceedings Volume PC13106, Photonics for Quantum 2024; PC1310618 (2024) https://doi.org/10.1117/12.3029474
Event: Photonics for Quantum, 2024, Waterloo, Ontario, Canada

Conference Poster

Abstract

An on-demand source of bright entangled photon pairs is desirable for quantum key distribution (QKD) and quantum repeaters. The leading candidate to generate entangled photon pairs is based on spontaneous parametric down-conversion (SPDC) in a non-linear crystal. However, a fundamental trade-off exists between entanglement fidelity and efficiency in SPDC sources due to multiphoton emission at high brightness, which limits the pair extraction efficiency to 0.1% when operating at near-unity fidelity. Quantum dots in photonic nanostructures can in principle overcome this trade-off; however, the quantum dots that have achieved an en- entanglement fidelity on par with an SPDC source (99%) have poor pair extraction efficiency of 0.01%. Here, we show a measured peak concurrence of 95.3% ± 0.5% and pair extraction efficiency of 0.65% from an InAsP quantum dot in an InP photonic nanowire waveguide. Additionally, we show that an oscillating two-photon Bell state generated by a semiconductor quantum dot can establish a secure key for peer-to-peer QKD while using all generated photon pairs. Using our time-resolved QKD scheme alleviates the need to remove the exciton fine structure splitting.

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Matteo Pennacchietti, Brady Cunard, Shlok Nahar, Mohd Zeeshan, Sayan Gangopadhyay, Dan Dalacu, Philip J. Poole, Andreas Fognini, Klaus Jöns, Val Zwiller, Thomas Jennewein, Norbert Lütkenhaus, and Michael E. Reimer "Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution", Proc. SPIE PC13106, Photonics for Quantum 2024, PC1310618 (16 August 2024); https://doi.org/10.1117/12.3029474

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