Rydberg assisted light shift imbalance induced blockade in an atomic ensemble

OPTICS COMMUNICATIONS

卷:339

Article

Tu, Yanfei¹  Kim, May E.²  Shahriarar, Selim M.^1,2 

[1] Northwestern Univ, Dept Elect Engn & Comp Sci, Evanston, IL 60208 USA

[2] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

关键词: Light shift blockade;    Atomic ensemble;    Rydberg interaction;    Quantum computing;   

DOI  :  10.1016/j.optcom.2014.11.038

来源: Elsevier

【 摘 要 】

Previously, we had proposed the technique of light shift imbalance induced blockade which leads to a condition where a collection of non-interacting atoms under laser excitation remains combined to a superposition of the ground and the first excited states, thus realizing a collective state quantum bit which in turn can be used to realize a quantum computer. In this paper, we show first that the light shift imbalance by itself is actually not enough to produce such a blockade, and explain the reason why the limitation of our previous analysis had reached this constraint. We then show that by introducing Rydberg interaction, it is possible to achieve such a blockade for a wide range of parameters. Analytic arguments used to establish these results are confirmed by numerical simulations. The fidelity of coupled quantum gates based on such collective state qubits is highly insensitive to the exact number of atoms in the ensemble. As such, this approach may prove to be viable for scalable quantum computing based on neutral atoms. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free