Triggered single-photon generation and resonance fluorescence in ultra-low loss integrated photonic circuits

Abstract

A central requirement for photonic quantum information processing systems lies in the combination of nonclassical light sources and low-loss, phase-stable optical modes. While substantial progress has been made separately towards ultra-low loss, $\le 1$ dB/m, chip-scale photonic circuits and high brightness single-photon sources, integration of these technologies has remained elusive. Here, we report a significant advance towards this goal, in the hybrid integration of a quantum emitter single-photon source with a wafer-scale, ultra-low loss silicon nitride photonic integrated circuit. We demonstrate triggered and pure single-photon emission directly into a Si${}_3$N${}_4$ photonic circuit with $\approx 1$ dB/m propagation loss at a wavelength of $\approx 920$ nm. These losses are more than two orders of magnitude lower than reported to date for any photonic circuit with on-chip quantum emitter sources, and $>50$ % lower than for any prior foundry-compatible integrated quantum photonic circuit, to the best of our knowledge. Using these circuits we report the observation of resonance fluorescence in the strong drive regime, a milestone towards integrated coherent control of quantum emitters. These results constitute an important step forward towards the creation of scaled chip-integrated photonic quantum information systems.

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• Deterministic entangling gates with nonlinear quantum photonic interferometers
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• Reconfigurable quantum photonic circuits based on quantum dots
• A Concise Primer on Solid-State Quantum Emitters
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• Characterizing Gaussian quantum processes with Gaussian resources
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