Dür W, Aschauer H, Briegel H-J
Sektion Physik, Ludwig-Maximilians-Universität München, Theresienstrasse 37, D-80333 München, Germany.
Phys Rev Lett. 2003 Sep 5;91(10):107903. doi: 10.1103/PhysRevLett.91.107903.
We introduce a class of multiparticle entanglement purification protocols that allow us to distill a large class of entangled states. These include cluster states, Greenberger-Horne-Zeilinger states, and various error correction codes all of which belong to the class of two-colorable graph states. We analyze these schemes under realistic conditions and observe that they are scalable; i.e., the threshold value for imperfect local operations does not depend on the number of parties for many of these states. When compared to schemes based on bipartite entanglement purification, the protocol is more efficient and the achievable quality of the purified states is larger. As an application we discuss an experimental realization of the protocol in optical lattices which allows one to purify cluster states.
我们介绍了一类多粒子纠缠纯化协议，这些协议使我们能够提纯一大类纠缠态。其中包括簇态、格林伯格-霍恩-泽林格态以及各种纠错码，所有这些都属于双色图态类别。我们在现实条件下分析了这些方案，并观察到它们具有可扩展性；也就是说，对于许多这类状态，不完美局部操作的阈值不依赖于参与方的数量。与基于两体纠缠纯化的方案相比，该协议效率更高，提纯态可达到的质量也更高。作为一个应用，我们讨论了该协议在光学晶格中的实验实现，这使得人们能够提纯簇态。
