Effect of phase shifts on EPR entanglement generated on two propagating Gaussian fields via coherent feedback
For researchers in quantum optics and continuous-variable quantum information, this is an incremental study of a specific noise source (phase shifts) in a known entanglement generation scheme.
This paper investigates how phase shifts in the transmission channel affect EPR entanglement in a dual-NOPA coherent feedback system, finding that entanglement can degrade or vanish but can be partially restored by adding phase shifters at the outputs under certain conditions.
Recent work has shown that deploying two nondegenerate optical parametric amplifiers (NOPAs) separately at two distant parties in a coherent feedback loop generates stronger Einstein-Podolski-Rosen (EPR) entanglement between two propagating continuous-mode output fields than a single NOPA under same pump power, decay rate and transmission losses. The purpose of this paper is to investigate the stability and EPR entanglement of a dual-NOPA coherent feedback system under the effect of phase shifts in the transmission channel between two distant parties. It is shown that, in the presence of phase shifts, EPR entanglement worsens or can vanish, but can be improved to some extent in certain scenarios by adding a phase shifter at each output with a certain value of phase shift. In ideal cases, in the absence of transmission and amplification losses, existence of EPR entanglement and whether the original EPR entanglement can be recovered by the additional phase shifters are decided by values of the phase shifts in the path.