Distributed entanglement generation between continuous-mode Gaussian fields with measurement-feedback enhancement
arXiv:1209.5925 · doi:10.1103/PhysRevA.86.022337
Abstract
This paper studies a scheme of two spatially distant oscillator systems that are connected by Gaussian fields and examines distributed entanglement generation between two continuous-mode output Gaussian fields that are radiated by the oscillators. It is demonstrated that using measurement-feedback control while a non-local effective entangling operation is on can help to enhance the Einstein-Podolski-Rosen (EPR)-like entanglement between the output fields. The effect of propagation delays and losses in the fields interconnecting the two oscillators, and the effect of other losses in the system, are also considered. In particular, for a range of time delays the measurement feedback controller is able to maintain stability of the closed-loop system and the entanglement enhancement, but the achievable enhancement is only over a smaller bandwidth that is commensurate with the length of the time delays.
11 pages, 10 figures. Almost identical to the published version (the latter has some final minor editorial changes)
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- On the optimal feedback control of linear quantum systems in the presence of thermal noise
- General-dyne unravelling of a thermal master equation
- Quantum filtering of a thermal master equation with purified reservoir
- Locally optimal control of continuous variable entanglement
- Effect of phase shifts on EPR entanglement generated on two propagating Gaussian fields via coherent feedback