Observation of continuous-wave squeezed light at 1550 nm

TL;DR

This paper demonstrates the generation of continuous-wave squeezed vacuum states at 1550 nm using optical parametric amplification, achieving a noise reduction of 5.3 dB below shot noise, which is significant for quantum optics and communication.

Contribution

The work presents the first continuous-wave squeezed light at 1550 nm using PPKTP in a standing-wave cavity, with a notable noise reduction of 5.3 dB.

Findings

Achieved 5.3 dB noise reduction below shot noise.

Generated continuous-wave squeezed vacuum at 1550 nm.

Used PPKTP crystal in a standing-wave cavity.

Abstract

We report on the generation of continuous-wave squeezed vacuum states of light at the telecommunication wavelength of 1550 nm. The squeezed vacuum states were produced by type I optical parametric amplification (OPA) in a standing-wave cavity built around a periodically poled potassium titanyl phosphate (PPKTP) crystal. A non-classical noise reduction of 5.3 dB below the shot noise was observed by means of balanced homodyne detection.