Quantum Information Science, School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom.
Phys Rev Lett. 2011 Aug 19;107(8):083601. doi: 10.1103/PhysRevLett.107.083601. Epub 2011 Aug 16.
We present an improved phase estimation scheme employing entangled coherent states and demonstrate that these states give the smallest variance in the phase parameter in comparison to NOON, "bat," and "optimal" states under perfect and lossy conditions. As these advantages emerge for very modest particle numbers, the optical version of entangled coherent state metrology is achievable with current technology.
我们提出了一种改进的相位估计方案，利用纠缠相干态，并证明在理想和损耗条件下，与 NOON、“蝙蝠”和“最优”态相比，这些态在相位参数方面具有最小的方差。由于这些优势在非常小的粒子数下出现，因此当前技术可以实现光学版本的纠缠相干态计量。
