Observation and Manipulation of Optical Parametric Down-Conversion in the Langevin Regime

TL;DR

This paper reports the experimental realization of optical parametric down-conversion in the Langevin regime on a chip, demonstrating quantum fluctuation effects such as asymmetric Hong-Ou-Mandel dips and photon compression, advancing quantum state control.

Contribution

It introduces the first on-chip experimental realization of PDC in the Langevin regime, highlighting fluctuation control and quantum effects in integrated photonics.

Findings

Observation of asymmetric Hong-Ou-Mandel dip

Fluctuation-induced compression of single photons

Control of loss tied to quantum fluctuation

Abstract

Quantum fluctuation plays a key role in the parametric down-conversion in the Langevin regime. In this paper, we report the experimental realization of optical parametric down-conversion in the Langevin regime on a chip. By precisely controlling the loss inherently tied to fluctuation, we observe the asymmetric Hong-Ou-Mandel dip - a hallmark of quantum fluctuation in the fluctuation-driven PDC, and the fluctuation-induced compression of single photons by nearly one order of magnitude. These findings pave the way for the manipulation of quantum fluctuation, quantum states, and system-reservoir interaction.