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Geunhee Gwak, Byeong-Yoon Go

Korea Advanced Institute of Science and Technology

Squeezed light generation at 1550nm

We report an experimental generation of squeezed light at 1550nm using a continuous-wave laser. An electric field noise reduction of 1.5 dB below the shot noise was observed. To generate squeezed light, we employed parametric down conversion (PDC) process where 775nm pump light is converted to 1550nm squeezed field. The 775nm pump was produced by second harmonic generation (SHG) in a single pass design. We made an optical parametric oscillator (OPO), the optical resonator where PDC process occurs. Homodyne detection was utilized to measure squeezed light. Such squeezed light can find wide applications in photonic quantum technologies, for instance, quantum-enhanced metrology, quantum imaging below shot noise, and quantum simulations like Gaussian boson sampling.

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