Tunable Squeezing Using Coupled Ring Resonators on a Silicon Nitride Chip

Abstract

We demonstrate continuous tuning of the squeezing level generated in a double-ring optical parametric oscillator by externally controlling the coupling condition using electrically controlled integrated microheaters. We accomplish this by utilizing the avoided crossing exhibited by a pair of coupled silicon nitride microring resonators. We directly detect a change in the squeezing level from 0.5 dB in the undercoupled regime to 2 dB in the overcoupled regime, which corresponds to a change in the generated on-chip squeezing factor from 0.9 dB to 3.9 dB. Such wide tunability in the squeezing level can be harnessed for on-chip quantum enhanced sensing protocols which require an optimal degree of squeezing.

9 pages, 4 figures

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• Photonic quantum technologies
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• Silicon-Chip Mid-Infrared Frequency Comb Generation
• Quantum-enhanced optical phase tracking
• Tunable frequency combs based on dual microring resonators
• Strong polarization mode coupling in microresonators
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