Periodic squeezing in a polariton Josephson junction

TL;DR

This paper demonstrates periodic bunching in a polariton Josephson junction due to quadrature squeezing, revealing how weakly coupled bosonic modes can produce nonclassical light statistics, advancing understanding of quantum effects in microcavities.

Contribution

It experimentally shows that weakly coupled polariton modes can generate strong deviations from Poissonian statistics through squeezing, a novel insight into nonclassical light in such systems.

Findings

Periodic bunching observed in polariton Josephson junctions

Bunching linked to quadrature squeezing effects

Results suggest potential for nonclassical light in semiconductor microcavities

Abstract

The use of a Kerr nonlinearity to generate squeezed light is a well-known way to surpass the quantum noise limit along a given field quadrature. Nevertheless, in the most common regime of weak nonlinearity, a single Kerr resonator is unable to provide the proper interrelation between the field amplitude and squeezing required to induce a sizable deviation from Poissonian statistics. We demonstrate experimentally that weakly coupled bosonic modes allow exploration of the interplay between squeezing and displacement, which can give rise to strong deviations from the Poissonian statistics. In particular, we report on the periodic bunching in a Josephson junction formed by two coupled exciton-polariton modes. Quantum modeling traces the bunching back to the presence of quadrature squeezing. Our results, linking the light statistics to squeezing, are a precursor to the study of nonclassical features in semiconductor microcavities and other weakly nonlinear bosonic systems.