Entangling remote qubits using the single-photon protocol: an in-depth
theoretical and experimental study
- URL: http://arxiv.org/abs/2208.07449v1
- Date: Mon, 15 Aug 2022 21:56:40 GMT
- Title: Entangling remote qubits using the single-photon protocol: an in-depth
theoretical and experimental study
- Authors: S. L. N. Hermans, M. Pompili, L. Dos Santos Martins, A. R.-P.
Montblanch, H. K. C. Beukers, S. Baier, J. Borregaard and R. Hanson
- Abstract summary: In the single-photon, protocol entanglement is heralded by generation of qubit-photon entangled states and subsequent detection of a single photon behind a beam splitter.
We develop an extensive theoretical model and tailor it to our experimental setting, based on nitrogen-vacancy centers in diamond.
We find that imperfect optical excitation can lead to a detection-arm-dependent entangled state fidelity and rate.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The generation of entanglement between remote matter qubits has developed
into a key capability for fundamental investigations as well as for emerging
quantum technologies. In the single-photon, protocol entanglement is heralded
by generation of qubit-photon entangled states and subsequent detection of a
single photon behind a beam splitter. In this work we perform a detailed
theoretical and experimental investigation of this protocol and its various
sources of infidelity. We develop an extensive theoretical model and
subsequently tailor it to our experimental setting, based on nitrogen-vacancy
centers in diamond. Experimentally, we verify the model by generating remote
states for varying phase and amplitudes of the initial qubit superposition
states and varying optical phase difference of the photons arriving at the beam
splitter. We show that a static frequency offset between the optical
transitions of the qubits leads to an entangled state phase that depends on the
photon detection time. We find that the implementation of a Charge-Resonance
check on the nitrogen-vacancy center yields transform-limited linewidths.
Moreover, we measure the probability of double optical excitation, a
significant source of infidelity, as a function of the power of the excitation
pulse. Finally, we find that imperfect optical excitation can lead to a
detection-arm-dependent entangled state fidelity and rate. The conclusion
presented here are not specific to the nitrogen-vacancy centers used to carry
out the experiments, and are therefore readily applicable to other qubit
platforms.
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