Strongly squeezed states at 532 nm based on frequency up-conversion

TL;DR

This paper demonstrates the generation of strongly squeezed vacuum states at 532 nm through frequency up-conversion from 1550 nm, enabling quantum metrology applications at shorter wavelengths.

Contribution

It introduces a novel method to produce strongly squeezed states at 532 nm via frequency up-conversion, overcoming previous material limitations.

Findings

Achieved 5.5 dB noise suppression in squeezed states at 532 nm

Successfully employed up-converted states in a Mach-Zehnder interferometer

Showed potential for enhanced quantum metrology at visible wavelengths

Abstract

Quantum metrology utilizes nonclassical states to improve the precision of measurement devices. In this context, strongly squeezed vacuum states of light have proven to be a useful resource. They are typically produced by spontaneous parametric down-conversion, but have not been generated at shorter wavelengths so far, as suitable nonlinear materials do not exist. Here, we report on the generation of strongly squeezed vacuum states at 532 nm with 5.5 dB noise suppression by means of frequency up-conversion from the telecommunication wavelength of 1550 nm. The up-converted states are employed in a model Mach-Zehnder interferometer to illustrate their use in quantum metrology.