Simultaneous implementation of n SWAP gates using superconducting charge qubits coupled to a cavity

Based on superconducting quantum interference devices (SQUIDs) coupled to a cavity, we propose a scheme for implementing n SWAP gates simultaneously. In our scheme, the SQUID works in the charge regime, the quantum logic gate operations are performed in the subspace spanned by two charge states | 0...

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Bibliographic Details
Published in:Optics communications 2010-02, Vol.283 (3), p.506-508
Main Authors: Song, Ke-Hui, Zhao, Yu-Jing, Shi, Zhen-Gang, Xiang, Shao-Hua, Chen, Xiong-Wen
Format: Article
Language:English
Subjects:
Charge
Classical and quantum physics: mechanics and fields
Exact sciences and technology
Gates
Holes
Physics
Quantum information
Qubits (quantum computing)
SQUIDs
Subspaces
Superconducting quantum interference devices
Superconductivity
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Summary:Based on superconducting quantum interference devices (SQUIDs) coupled to a cavity, we propose a scheme for implementing n SWAP gates simultaneously. In our scheme, the SQUID works in the charge regime, the quantum logic gate operations are performed in the subspace spanned by two charge states | 0 〉 and | 1 〉 . The interaction between the qubits and the cavity field can be achieved by turning the gate voltage and the external flux. Especially, the gate operation time is independent of the number of the qubits, and the gate operation is insensitive to the initial state of the cavity mode. We also analyze the experimental feasibility that the conditions of the large detuning can be achieved by adjusting the frequency of the cavity mode, and the operation time satisfies the requirement for the designed experiment by choosing suitable detuning and the quality factor of the cavity. Based on the simple operation, our scheme may be realized in this solid-state system, and our idea may be realized in other systems.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2009.10.069