Squeezing states of light in a surface nanoscale axial photonics microresonator

A. N. Danilin, Timur R. Yunusov, Alexey P. Dushanin +6 more

Alexander E. Ulanov, Bastian Ruhnke, Thibault Wildi +1 more

Tabassom Hamidfar, Prem Kumar

We introduce a new approach for quantum frequency conversion of narrowband optical signals by four-wave mixing in a surface nanoscale axial photonics (SNAP) microresonator. We also discuss a SNAP-based scheme for generating amplitude-squeezed light.

Alexander E. Ulanov, Bastian Ruhnke, Thibault Wildi +1 more

Squeezed states of light are essential for emerging quantum technology in metrology and information processing. Chip-integrated photonics offers a route to scalable and efficient squeezed light generation, however, parasitic nonlinear processes and optical losses remain significant challenges. Here, we demonstrate single-mode quadrature squeezing in a photonic crystal microresonator via degenerate dual-pump spontaneous four-wave mixing. Implemented in a scalable, low-loss silicon-nitride photonic-chip platform, the microresonator features a tailored nano-corrugation that modifies its resonances to suppress parasitic nonlinear processes. In this way, we achieve an estimated 7.8 dB of on-chip squeezing in the bus waveguide, with potential for further improvement. These results open a promising pathway toward integrated squeezed light sources for quantum-enhanced interferometry, Gaussian boson sampling, coherent Ising machines, and universal quantum computing.

Tsz Ki Liu

Alexander E. Ulanov, Bastian Ruhnke, Thibault Wildi +1 more

Squeezed states of light are essential for emerging quantum technology in metrology and information processing. Chip-integrated photonics offers a route to scalable and efficient squeezed light generation, however, parasitic nonlinear processes and optical losses remain significant challenges. Here, we demonstrate single-mode quadrature squeezing in a photonic crystal microresonator via degenerate dual-pump spontaneous four-wave mixing. Implemented in a scalable, low-loss silicon-nitride photonic-chip platform, the microresonator features a tailored nano-corrugation that modifies its resonances to suppress parasitic nonlinear processes. In this way, we achieve an estimated 7.8 dB of on-chip squeezing in the bus waveguide, with potential for further improvement. These results open a promising pathway toward integrated squeezed light sources for quantum-enhanced interferometry, Gaussian boson sampling, coherent Ising machines, and universal quantum computing.