连续变量量子信息的鲁棒原子态

A. Vudayagiri, Bappaditya Sankhari
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摘要

利用碱原子(如铷或钠)的一组塞曼亚能级,我们提出构建一对可以单独寻址和随意填充的相干居族阱(CPT)态。系统可以被安排成存在一个修饰态,该修饰态是这两个CPT态的线性组合。我们之前已经展示了使用这种结构形成离散量子门的能力[J.Phys]。B,(2006), 39, 39[19]。在当前的通信中,我们将展示如何使用相同的配置来准备和操作连续变化的状态。状态可以映射到二维参数空间,这样就可以在其中准备任何所需的向量,并且从一个向量到另一个向量的连续的,绝热的演化也是可能的。本文还提出了一种利用连续相互作用势的方法,该方法可用于量子计算。我们讨论了如何使用这些状态来执行连续变量量子计算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Robust atomic states for quantum information with continuous variables
Using a set of Zeeman sublevels of an alkali atom such as rubidium or sodium, we propose to construct a pair of coherentc population trap (CPT) states, which can be individually addressed and populated at will. The system can be arranged such that there exists a dressed state that is a linear combination of these two CPT states. We have earlier shown the capability of forming discrete quantum gates using this configuration [J.Phys. B, (2006), 39, 3919]. In the present communication, we will show how the same configuration can be used to prepare and operate continuously varying states. The state can be mapped to a 2D parametric space in such a way that any desired vector within it can be prepared, and a continuous, adiabatic evolution from one vector to another is also possible. A method to exploit a continuous interaction potential, which can be used in quantum computation, is also suggested. We discuss how a continuous variable quantum computation can be performed using such states.
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