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

摘要

We propose and analyse a nonlinear optical apparatus in which the directionof asymmetric steering is controllable within the apparatus, rather than byadding noise to measurements. Using a nondegenerate parametric oscillator withan injected signal field, we show how the directionality and extent of thesteering can be readily controlled for output modes which can be up to oneoctave apart. The two downconverted modes, which exhibit the greater violationsof the steering inequalities, can also be controlled to exhibit asymmetricsteering in some regimes.