Controlled asymmetry of EPR steering with an injected non-degenerate optical parametric oscillator

TL;DR

This paper introduces a nonlinear optical setup using a nondegenerate parametric oscillator with injected signals, enabling controllable asymmetric EPR steering between output modes, which can be tuned without adding measurement noise.

Contribution

It presents a novel method to control the direction and extent of EPR steering in a nonlinear optical system through internal apparatus parameters.

Findings

Steering directionality can be controlled within the apparatus.

Output modes can be up to one octave apart.

Greater violations of steering inequalities observed in certain regimes.

Abstract

We propose and analyse a nonlinear optical apparatus in which the direction of asymmetric steering is controllable within the apparatus, rather than by adding noise to measurements. Using a nondegenerate parametric oscillator with an injected signal field, we show how the directionality and extent of the steering can be readily controlled for output modes which can be up to one octave apart. The two downconverted modes, which exhibit the greater violations of the steering inequalities, can also be controlled to exhibit asymmetric steering in some regimes.