On-chip Quantum Measurement of Squeezing Generated from a Silicon Nitride Micro-ring Resonator

• URL: http://arxiv.org/abs/2608.03402v1
• Date: Tue, 04 Aug 2026 09:56:21 GMT
• Title: On-chip Quantum Measurement of Squeezing Generated from a Silicon Nitride Micro-ring Resonator
• Abstract summary: This work implements the idea of on-chip quantum measurement with the aid of a parametric amplifier.<n>We observe a quantum noise reduction of 4.6 dB from the first ring, despite a chip-to-fiber coupling loss exceeding 5 dB.<n>This work also demonstrates the first monolithic SU (1,1) interferometer with an estimated 5 dB signal-to-noise enhancement.
• Score: 2.551009456340048
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Integration of quantum optical technique on-chip is crucial for large scale applications of quantum technology, which were proven in a free space environment to be superior to the corresponding classical technology. Squeezed states of light can be used for enhancing the sensitivity of quantum sensors and for fault-tolerant quantum computing. Although chip-based squeezed light generation has advanced significantly, practical impact remains limited because coupling losses between the chip and off-chip detectors destroy delicate quantum correlations, restricting the amount of observed squeezing. Here, we overcome this limitation by implementing the idea of on-chip quantum measurement with the aid of a parametric amplifier and applying it to the squeezed state generated by a silicon nitride (SiN) microring resonator. In our scheme, two matched SiN micro-rings are sequentially constructed. The first ring generates a squeezed state, whereas the second ring acts as a high-gain parametric amplifier (PA) that measures the squeezed state before the light experiences significant off-chip loss. This architecture is inherently loss-tolerant: the amplifier elevates the quantum noise well above the vacuum level, making the measurement insensitive to downstream losses. We directly observe a quantum noise reduction of 4.6 dB from the first ring, despite a chip-to-fiber coupling loss exceeding 5 dB. This work also demonstrates the first monolithic SU(1,1) interferometer with an estimated 5 dB signal-to-noise enhancement compared to traditional linear interferometers, and thus establishes a practical pathway for chip-based quantum sensors.

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