Quantum logic gates operation using SQUID qubits in bimodal cavity

doi:10.1088/1009-1963/15/2/008

中国物理B ›› 2006, Vol. 15 ›› Issue (2): 286-291.doi: 10.1088/1009-1963/15/2/008

Quantum logic gates operation using SQUID qubits in bimodal cavity

宋克慧

Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China; Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 23026, China

收稿日期:2005-02-03 修回日期:2005-08-12 出版日期:2006-02-20 发布日期:2006-02-20

Quantum logic gates operation using SQUID qubits in bimodal cavity

Song Ke-Hui (宋克慧)

Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China; Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 23026, China

Received:2005-02-03 Revised:2005-08-12 Online:2006-02-20 Published:2006-02-20

摘要/Abstract

摘要： We present a scheme to realize the basic two-qubit logic gates such as the quantum phase gate and SWAP gate using a detuned microwave cavity interacting with three-level superconducting-quantum-interference-device (SQUID) qubit(s), by placing SQUID(s) in a two-mode microwave cavity and using adiabatic passage methods. In this scheme, the two logical states of the qubit are represented by the two lowest levels of the SQUID, and the cavity fields are treated as quantized. Compared with the previous method, the complex procedures of adjusting the level spacing of the SQUID and applying the resonant microwave pulse to the SQUID to create transformation are not required. Based on superconducting device with relatively long decoherence time and simplified operation procedure, the gates operate at a high speed, which is important in view of decoherence.

关键词: superconducting-quantum-interference-device, bimodal cavity, adiabatic passage, quantum logic gate

Abstract: We present a scheme to realize the basic two-qubit logic gates such as the quantum phase gate and SWAP gate using a detuned microwave cavity interacting with three-level superconducting-quantum-interference-device (SQUID) qubit(s), by placing SQUID(s) in a two-mode microwave cavity and using adiabatic passage methods. In this scheme, the two logical states of the qubit are represented by the two lowest levels of the SQUID, and the cavity fields are treated as quantized. Compared with the previous method, the complex procedures of adjusting the level spacing of the SQUID and applying the resonant microwave pulse to the SQUID to create transformation are not required. Based on superconducting device with relatively long decoherence time and simplified operation procedure, the gates operate at a high speed, which is important in view of decoherence.

Key words: superconducting-quantum-interference-device, bimodal cavity, adiabatic passage, quantum logic gate

中图分类号: (Superconducting quantum interference devices (SQUIDs))

85.25.Dq

03.67.Lx (Quantum computation architectures and implementations)

宋克慧. Quantum logic gates operation using SQUID qubits in bimodal cavity[J]. 中国物理B, 2006, 15(2): 286-291.

Song Ke-Hui (宋克慧). Quantum logic gates operation using SQUID qubits in bimodal cavity[J]. Chinese Physics, 2006, 15(2): 286-291.

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Quantum logic gates operation using SQUID qubits in bimodal cavity

Quantum logic gates operation using SQUID qubits in bimodal cavity

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