2 research outputs found
Enhancement of the indistinguishability of single photon emitters coupled to photonic waveguides
One of the main steps towards large-scale quantum photonics consists of the
integration of single photon sources (SPS) with photonic integrated circuits
(PICs). For that purpose, the PICs should offer an efficient light coupling and
a high preservation of the indistinguishability of photons. Therefore,
optimization of the indistinguishability through waveguide design is especially
relevant. In this work we have developed an analytical model to calculate the
coupling and the indistinguishability of an ideal point-source quantum emitter
coupled to a photonic waveguide depending on source orientation and position.
The model has been numerically evaluated through finite-difference time-domain
(FDTD) simulations showing consistent results. The maximum coupling is achieved
when the emitter is embedded in the center of the waveguide but somewhat
surprisingly the maximum indistinguishability appears when the emitter is
placed at the edge of the waveguide where the electric field is stronger due to
the surface discontinuity
High precision integrated photonic thermometry enabled by a transfer printed diamond resonator on GaN waveguide chip
We demonstrate a dual-material integrated photonic thermometer, fabricated by high accuracy micro-transfer printing. A freestanding diamond micro-disk resonator is printed in close proximity to a gallium nitride on a sapphire racetrack resonator, and respective loaded Q factors of 9.1 × 104 and 2.9 × 104 are measured. We show that by using two independent wide-bandgap materials, tracking the thermally induced shifts in multiple resonances, and using optimized curve fitting tools the measurement error can be reduced to 9.2 mK. Finally, for the GaN, in a continuous acquisition measurement we record an improvement in minimum Allan variance, occurring at an averaging time four times greater than a comparative silicon device, indicating better performance over longer time scales