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题名: On effectiveness of protocol creating maximum entanglement of two charge-phase qubits by cavity field
作者: Li Chong ;  Gao Yi-Bo
刊名: COMMUNICATIONS IN THEORETICAL PHYSICS
出版日期: 2007
卷号: 48, 期号:5, 页码:935-942
关键词: MACROSCOPIC QUANTUM STATES ;  DECOHERENCE ;  COMPUTATION ;  CODES ;  BITS
学科分类: Physics
通讯作者: Li, C , Dalian Univ Technol, Dept Phys, Dalian 116024, Peoples R China
部门归属: Dalian Univ Technol, Dept Phys, Dalian 116024, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Beijing Univ Technol, Dept Appl Phys, Beijing 100022, Peoples R China
英文摘要: We revisit the protocols to create maximally entangled states between two Josephson junction (JJ) charge phase qubits coupled to a microwave field in a cavity as a quantum data bus. We analyze a novel mechanism of quantum decoherence due to the adiabatic entanglement between qubits and the data bus, the off-resonance microwave field. We show that even if the variable of the data bus can be adiabatically eliminated, the entanglement between the qubits and data bus remains and can decohere the superposition of two-particle state. Fortunately we can construct a decoherence-free subspace of two-dimension to against this adiabatic decoherence. To carry out the analytic study for this decollerence problem, we develop Frohlich transformation to re-derive the effective Hamiltonian of these systems, which is equivalent to that obtained from the adiabatic elimination approach.
收录类别: SCI
WOS记录号: WOS:000251391800036
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5627
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Li Chong,Gao Yi-Bo. On effectiveness of protocol creating maximum entanglement of two charge-phase qubits by cavity field[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2007,48(5):935-942.
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