Coupling Tin-Vacancy Centres to Diamond Waveguides
C.F. Primavera (TU Delft - Applied Sciences)
R. Hanson β Mentor (TU Delft - QID/Hanson Lab)
Matteo Pasini β Mentor (TU Delft - QID/Hanson Lab)
R.A. Norte β Graduation committee member (TU Delft - Dynamics of Micro and Nano Systems)
Johannes Borregaard β Graduation committee member (TU Delft - QN/Borregaard groep)
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Abstract
SnV centres in diamond are a promising candidate for quantum internet applications because of their strong spin-photon interface, long spin coherence times, and insensitivity to electric fields. Integrating them in diamond waveguides could strongly improve entanglement rates and could make for a scalable design. In this thesis, we show using simulations that rectangular <110> waveguides are good candidates for high emitter-waveguide coupling, reaching a maximum of 79%. Optimal dimensions are 250 nm x 120 nm (width x height). This also falls inside the single-mode regime for the emitted light. The measured lifetime limits for the linewidth of Ξ = 25 MHz, dephasing of Ξ_π = 10 MHz, and >10 seconds long spectral stability in the bulk diamond sample, together with an APD dark count rate of 171 Hz should lead to a transmission dip around resonance of Ξπ/π = 25%, which we predict using a different simulation. The currently obtained taper coupling from diamond waveguide to optical fiber is approximately 10%. This is probably enough to see the transmission dip, but it needs to be improved for future experiments. Post-selecting SnV centres in waveguides and using Purcell enhancement to boost ZPL emission can further improve these results.