Observation of Robust Polarization Squeezing via the Kerr Nonlinearity in an Optical Fiber

Squeezed light is one of the resources of photonic quantum technology. Among the various nonlinear interactions capable of generating squeezing, the optical Kerr effect is particularly easy-to-use. A popular venue is to generate polarization squeezing, which is a special self-referencing variant of two-mode squeezing. To date, polarization squeezing generation setups have been very sensitive to fluctuations of external factors and have required careful tuning. In this work, a development of a new all-fiber setup for polarization squeezing generation is reported. The setup consists of passive elements only and is simple, robust, and stable. More than 5 dB of directly measured squeezing is obtained over long periods of time without any need for adjustments. Thus, the new scheme provides a robust and easy-to-set-up way of obtaining squeezed light applicable to different applications. The impact of pulse duration and pulse power on the degree of squeezing is investigated.

Automated summary

This paper reports on a new all-fiber setup for generating polarization squeezed light. The setup is composed of passive elements only, making it simple, stable, and easy to set up. More than 5 dB of directly measured squeezing is achieved over long periods of time without any adjustments. Therefore, this new scheme provides a robust and easy-to-set-up method for obtaining squeezed light applicable to various applications.