Scalable feedback control of single photon sources for photonic quantum technologies

Abstract

Large-scale quantum technologies require exquisite control over many individual quantum systems. Typically, such systems are very sensitive to environmental fluctuations, and diagnosing errors via measurements causes unavoidable perturbations. In this work we present an in situ frequency locking technique that monitors and corrects frequency variations in single photon sources based on microring resonators. By using the same classical laser fields required for photon generation as a probe to diagnose variations in the resonator frequency, our protocol applies feedback control to correct photon frequency errors in parallel to the optical quantum computation without disturbing the physical qubit. We implement our technique on a silicon photonic device and demonstrate sub 1 pm frequency stabilization in the presence of applied environmental noise, corresponding to a fractional frequency drift of <1 % of a photon linewidth. Using these methods we demonstrate feedback controlled quantum state engineering. By distributing a single local oscillator across a single chip or network of chips, our approach enables frequency locking of many single photon sources for large-scale photonic quantum technologies.

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Cited by in corpus (10)

• Integrated Photonic Quantum Technologies
• Near-ideal spontaneous photon sources in silicon quantum photonics
• Variational Quantum Unsampling on a Quantum Photonic Processor
• Advances in silicon quantum photonics
• Cryogenic operation of silicon photonic modulators based on DC Kerr effect
• Three-dimensional entanglement on a silicon chip
• Integrated Photonic Platforms for Quantum Technology: A Review
• Quantum transistor realized with a single $\Lambda$-level atom coupled to the microtoroidal cavity
• Super spontaneous four-wave mixing in an array of silicon microresonators
• A dataflow programming framework for linear optical distributed quantum computing