应用单模腔场中的超导量子干涉仪制备n比特W态的简单方案

Simple Scheme for Generating n-qubit W State Viaupper Conducting Quantum Interference Devices in a Cavity

提出了一个制备n比特W态的简单方案,利用一个单模腔场与放置在其中的n个超导量子干涉仪发生共振相互作用,且共振相互作用的耦合强度远大于其他作用的强度,此时,超导量子干涉仪其他能级与腔模间的相互作用可以忽略,这样,仅通过一步时间演化就可制得n比特W态.并且在衰减强度和耦合强度相接近时,仍然可以成功制备n比特W态.

We propose a simple scheme for generating n-qubit W state via superconducting quantum interference devices in a single-mode cavity. Superconducting quantum interference devices interact with the cavity resonantly, and the resonant coupling strength is much stronger than other interaction strength, so the other interaction is negligible. Thus, generating n-qubit W state is achieved by only one step evolution. In the case of the decay is close to the coupling of the cavity with the superconducting quantum interference devices, we still generate n-qubit W state successfully.