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Chinese Physics Letters

Implementation of a Quantum Conditional Phase Gate for the Quantum Fourier Transform in Circuit QED

余龙宝, 薛正远

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

联合到一个传播线共鸣器的多重超导的费用 qubits 能被控制完成在二任意的 qubits 之间的量逻辑门，是众所周知的。我们建议一个计划认识到量有由电路的一个几何性质的有条件的阶段门 electrodynamics，和它自然地被使用与高保真度认识到量 Fourier 变换。申请在现在的试验性的技术下面可行、可观，这也被表明。[从作者抽象]

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联合到一个传播线共鸣器的多重超导的费用 qubits 能被控制完成在二任意的 qubits 之间的量逻辑门，是众所周知的。我们建议一个计划认识到量有由电路的一个几何性质的有条件的阶段门 electrodynamics，和它自然地被使用与高保真度认识到量 Fourier 变换。申请在现在的试验性的技术下面可行、可观，这也被表明。[从作者抽象]
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It is well known that multiple superconducting charge qubits coupled to a transmission line resonator can be controlled to achieve quantum logic gates between two arbitrary qubits. We propose a scheme to realize a quantum conditional phase gate with a geometric property by circuit electrodynamics, and it is applied naturally to realize the quantum Fourier transform with high fidelity. It is also demonstrated that the application is feasible and considerable under the present experimental technology.
We propose a theoretical scheme for realizing the general conditional phase shift gate of charge qubits situated in a high-Q superconducting transmission line resonator. The phase shifting angle can be tuned from 0 to 2π by simply adjusting the qubit-resonator detuning and the interaction time. Based on this gate proposal, we give a detailed procedure to implement the three-qubit quantum Fourier transform with circuit quantum electrodynamics (QED). A careful analysis of the decoherence sources shows that the algorithm can be achieved with a high fidelity using current circuit QED techniques.