Physics

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

M. Pennacchietti, B. Cunard, et al.

This groundbreaking research showcases a highly efficient source of entangled photon pairs generated from an InAsP quantum dot within an InP nanowire, achieving a remarkable high fidelity of 97.5% ± 0.8%. The study tackles crucial challenges in quantum key distribution through an innovative time-resolved protocol, promising advancements in secure communications. This research was conducted by a team of experts including Matteo Pennacchietti, Brady Cunard, Shlok Nahar, and others.

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Abstract

This paper demonstrates a high-fidelity (97.5% ± 0.8%) and efficient (0.65%) source of entangled photon pairs from an InAsP quantum dot embedded in an InP nanowire. The generated Bell state is shown to be suitable for secure quantum key distribution (QKD), overcoming challenges associated with fine-structure splitting (FSS) through a time-resolved QKD protocol. Two-photon resonant excitation is used to improve pair extraction efficiency and reduce multi-photon emission.

Publisher

Communications Physics

Published On

Feb 24, 2024

Authors

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

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