Experimental preparation of an arbitrary tunable Werner state
Tongjun Liu, Cen-Yang Wang, Jian Li, Qin Wang · Europhysics Letters (EPL) · 2017
We propose a simple and reliable method for engineering a tunable Werner state and realize it experimentally. The whole setup mainly includes a parametric down-conversion source and a controllable depolarization channel which consists of a Sagnac-like interferometer and some complete dephasing operations. The generated Werner states are characterized by quantum tomography, and very high concurrences and state fidelities can be achieved.