Robust and Scalable Scheme to Generate Large-Scale Entanglement Webs

Details Robust and Scalable Scheme to Generate Large-Scale Entanglement Webs Robust and Scalable Scheme to Generate Large-Scale Entanglement Webs

2011-02-23

arxiv.org/abs/1102.4682v1

Phys. Rev. A 83, 050303(R) (2011)

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

We propose a robust and scalable scheme to generate an $N$-qubit $W$ state among separated quantum nodes (cavity-QED systems) by using linear optics and postselections. The present scheme inherits the robustness of the Barrett-Kok scheme [Phys. Rev. A {\bf 71}, 060310(R) (2005)]. The scalability is also ensured in the sense that an arbitrarily large $N$-qubit $W$ state can be generated with a quasi-polynomial overhead $\sim 2^{O[(\log_2 N)^2]}$. The process to breed the $W$ states, which we introduce to achieve the scalability, is quite simple and efficient, and can be applied for other physical systems.

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