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理论物理通讯:英文版

Preparation of Macroscopic Quantum Superposition States of Cavity Modes Using rf-SQUIDs in a Cavity

Wang, Bo Bo

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

我们建议由把一台 rf 超导的量干扰设备(rf 枪乌) 放在一个单个模式的微波洞准备洞模式的 Schrodinger-cat 状态的一个潜在的计划。由适当地关于放射地调整 detuning 和力量,我们显示出怎么产生单个模式的 Schrodinger-cat 状态。概括我们讨论 engtangled 的产生的这个方法协调状态。我们的计划的试验性的可行性在洞腐烂的考虑下面被讨论。

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我们建议由把一台 rf 超导的量干扰设备(rf 枪乌) 放在一个单个模式的微波洞准备洞模式的 Schrodinger-cat 状态的一个潜在的计划。由适当地关于放射地调整 detuning 和力量,我们显示出怎么产生单个模式的 Schrodinger-cat 状态。概括我们讨论 engtangled 的产生的这个方法协调状态。我们的计划的试验性的可行性在洞腐烂的考虑下面被讨论。
我们建议一个其他的计划由使用联合到一个去谐得大部分的洞的超导的量干扰设备(枪乌) 准备 W 状态。现在的计划由断热的经过基于进化,在的地方仅仅由调节断热的联盟者我们能获得的古典微波脉搏的 Rabi 频率没有测量或任何辅助枪乌的标准 W 状态。因此,过程被简化,自从以动态或几何的方法的错误能被避免,计划能与很高的成功概率被完成。另外,枪乌系统和洞没有是激动的状态的概率。因此,激动水平的自发的排放或洞腐烂引起的 decoherence 被压制。
我们为由与高质量的因素在一个洞考虑 N 二水平的原子的多光子相互作用产生在高顺序的挤压的真空状态之间的宏观的重叠和纠纷建议一个有效计划,由一块强壮的开车地帮助了。通过洞的特定的选择, detuning ,在原子之间的很多个多党的纠缠的状态和高顺序的挤压的真空说并且洞在高顺序的挤压的真空之中声明罐头被准备,也包括“高顺序的挤压的真空状态的宏观的 Schrodinger 猫”,“宏观的 Schrodinger 猫”的纠缠的状态等等。我们的计划的可能的扩展和申请被讨论。我们的计划在在洞证完的当前的技术以内是可达到的。
We propose a potential scheme of preparing Schrodinger-cat state of the cavity mode by placing an rf-superconducting quantum interference device (rf-SQUID) in a single-mode microwave cavity. By properly adjusting the detuning and the strength regarding the radiation fields, we show how to generate single-mode Schrodinger-cat state. Generalizing this method we discuss the generation of the engtangled coherent states. The experimental feasibility of our scheme is discussed under consideration of the cavity decay.
Based on the measurement of charge states, we show that the superpositions of two macroscopically distinguishable coherent states (Schr\\"odinger cat states) of a single-mode cavity field can be generated by a controllable interaction between a cavity field and a SQUID-based charge qubit. After such cat states of the cavity field are created, the interaction can be switched off by the classical magnetic field through the SQUID, and there is no information transfer between the cavity field and the charge qubit. We also discuss the generation of superpositions of two squeezed coherent states.