Squeezed light generated with hyperradiance without nonlinearity

TL;DR

This paper demonstrates that squeezed light can be generated via quantum interference in a linear cavity-qubit system exhibiting hyperradiance, controllable by system parameters, without requiring nonlinear interactions.

Contribution

It introduces a novel linear system setup for generating squeezed light through quantum interference, avoiding the need for nonlinear media.

Findings

Squeezed light is produced in the hyperradiance regime under strong coupling and weak driving.

The Klyshko's criterion oscillates with photon number parity, indicating quantum correlations.

The squeezing angle can be tuned by adjusting the frequency detuning between the drive and qubits.

Abstract

We propose that the squeezed light accompanied by hyperradiance is induced by quantum interference in a linear system consisting of a high quality optical cavity and two coherently driven two-level qubits. When two qubits are placed at the crest and trough of the standing wave in the cavity respectively (i.e., they have the opposite coupling coefficient to the cavity), we show that squeezed light is generated in the hyperradiance regime under the conditions of strong coupling and weak driving. Simultaneously, the Klyshko's criterion alternates up and down at unity when the photon number is even or odd. Moreover, the orthogonal angles of the squeezed light can be controlled by adjusting the frequency detuning pressure between the driving field and the qubits. It can be implemented in a variety of quantum systems, including but not limited to two-level systems such as atoms, quantum dots in single-mode cavities.