Asbóth János K, Calsamiglia John, Ritsch Helmut
Institute of Theoretical Physics, University of Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.
Phys Rev Lett. 2005 May 6;94(17):173602. doi: 10.1103/PhysRevLett.94.173602. Epub 2005 May 5.
We propose the entanglement potential (EP) as a measure of nonclassicality for quantum states of a single-mode electromagnetic field. It is the amount of two-mode entanglement that can be generated from the field using linear optics, auxiliary classical states, and ideal photodetectors. The EP detects nonclassicality, has a direct physical interpretation, and can be computed efficiently. These three properties together make it stand out from previously proposed nonclassicality measures. We derive closed expressions for the EP of important classes of states and analyze as an example of the degradation of nonclassicality in lossy channels.
我们提出将纠缠势（EP）作为单模电磁场量子态非经典性的一种度量。它是利用线性光学、辅助经典态和理想光电探测器从该场中可产生的双模纠缠量。纠缠势可检测非经典性，具有直接的物理解释，并且能够高效计算。这三个特性共同使其从先前提出的非经典性度量中脱颖而出。我们推导了重要态类的纠缠势的封闭表达式，并作为有损信道中非经典性退化的一个例子进行分析。
