Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
Phys Rev Lett. 2010 Jun 4;104(22):220501. doi: 10.1103/PhysRevLett.104.220501. Epub 2010 Jun 1.
We determine a general upper bound for the steady-state entanglement achievable by continuous feedback for a system of any number of bosonic degrees of freedom. We apply such a bound to the specific case of parametric interactions--the most common practical way to generate entanglement in quantum optics--and single out optimal feedback strategies that achieve the maximal entanglement. We also consider the case of feedback schemes entirely restricted to local operations and compare their performance to the optimal, generally nonlocal, schemes.
我们为任意数量的玻色自由度系统的连续反馈确定了稳态纠缠的一般上限。我们将该上限应用于参数相互作用的具体情况-这是在量子光学中产生纠缠的最常见的实际方法-并挑出实现最大纠缠的最佳反馈策略。我们还考虑了完全限于本地操作的反馈方案，并将它们的性能与最佳的、通常是非本地的方案进行了比较。
