Observing near-unity entanglement from an indium-rich nanowire quantum dot

Matteo Pennacchietti; Mohd Zeeshan; Brady Cunard; Philip J. Poole; Dan Dalacu; Andreas Fognini; Klaus Jöns; Val Zwiller; Michael E. Reimer

doi:10.1117/12.2672966

19 July 2023 Observing near-unity entanglement from an indium-rich nanowire quantum dot

Matteo Pennacchietti, Mohd Zeeshan, Brady Cunard, Philip J. Poole, Dan Dalacu, Andreas Fognini, Klaus Jöns, Val Zwiller, Michael E. Reimer

Author Affiliations +

Proceedings Volume PC12633, Photonics for Quantum 2023; PC126330M (2023) https://doi.org/10.1117/12.2672966
Event: Photonics for Quantum, 2023, Rochester, New York, United States

Abstract

Quantum dots (QDs) embedded inside indium-phosphide (InP) nanowires have the potential to be bright, on-demand sources of perfect polarization-entangled photon pairs fabricated with near-unity yields. However, to date very high degrees of entanglement have not yet been measured from such devices. By performing quantum state tomography with state-of-the-art superconducting nanowire single-photon detectors (SNSPDs) and two-photon resonant excitation of the QD, we show that these sources are indeed capable of producing near-unity entangled photon pairs. We measure a raw peak fidelity of 97.5% +/- 0.8% and a lifetime-weighted fidelity of 0.94% +/- 0.04%. These results conclusively demonstrate that the majority of the degradation from unity-measured entanglement fidelity in earlier studies was not due to spin-spin dephasing from the large 9/2 nuclear spin of indium. These results solidify InP nanowire QDs as a promising platform for future quantum photonics applications.

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Matteo Pennacchietti, Mohd Zeeshan, Brady Cunard, Philip J. Poole, Dan Dalacu, Andreas Fognini, Klaus Jöns, Val Zwiller, and Michael E. Reimer "Observing near-unity entanglement from an indium-rich nanowire quantum dot", Proc. SPIE PC12633, Photonics for Quantum 2023, PC126330M (19 July 2023); https://doi.org/10.1117/12.2672966

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