Experimental preparation of an arbitrary tunable Werner state

作者：Tongjun Liu, Cen-Yang Wang, Jian Li, Qin Wang · 发表于：Europhysics Letters (EPL) · 年份：2017 · DOI：10.1209/0295-5075/119/14002 · 被引用次数：17 · 研究领域：Quantum Information and Cryptography、Quantum optics and atomic interactions、Quantum Mechanics and Applications

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.