Two-Photon Quantum Interference using a Single Nitrogen-Vacancy Center

Master Thesis (2021)
Author(s)

A. Teepe (TU Delft - Applied Sciences)

Contributor(s)

R Hanson – Mentor (TU Delft - QID/Hanson Lab)

K.L. van der Enden – Mentor (TU Delft - QID/Hanson Lab)

M. Blaauboer – Graduation committee member (TU Delft - QN/Blaauboer Group)

C.K. Andersen – Graduation committee member (TU Delft - Andersen Lab)

Faculty
Applied Sciences
Copyright
© 2021 Annick Teepe
More Info
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Publication Year
2021
Language
English
Copyright
© 2021 Annick Teepe
Graduation Date
18-06-2021
Awarding Institution
Delft University of Technology
Programme
['Applied Physics']
Faculty
Applied Sciences
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Abstract

Generation of high fidelity entanglement between quantum nodes is a key component of a future quantum internet. Heralded entanglement generation of two spatially separated qubit nodes can be established by interference and measurement of two photons, each entangled with one qubit state. The two-node entanglement fidelity is limited by the degree of indistinguishability of the photons, which can be measured in a Two-Photon Quantum Interference (TPQI) experiment. In this thesis, a TPQI experiment has been performed with photons emitted by a single Nitrogen-Vacancy (NV) center. This self-interference experiment shows a visibility of V=0.91±0.02 and a photon indistinguishability of J=0.945 in the Monte-Carlo method obtained 1σ-confidence interval of [0.920, 0.966] after correction for system imperfections, demonstrating near-perfect indistinguishability of zero-phonon line photons emitted by a single NV center. Furthermore, an extensive TPQI model was developed that includes possible arrival time- and frequency differences of the photons. This model predicts a dark- and noise count limited V=0.79±0.06 for a future two-node NV TPQI experiment with quantum frequency-converted photons, at a distinguishable photon coincidence rate of 1.2mHz, allowing for an experimentally feasible double-click two-node entanglement fidelity of 0.89±0.03.

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