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On effectiveness of protocol creating maximum entanglement of two charge-phase qubits by cavity field
Li Chong; Gao Yi-Bo; Li, C , Dalian Univ Technol, Dept Phys, Dalian 116024, Peoples R China
2007
发表期刊COMMUNICATIONS IN THEORETICAL PHYSICS
ISSN0253-6102
卷号48期号:5页码:935-942
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.
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
关键词Macroscopic Quantum States Decoherence Computation Codes Bits
学科领域Physics
收录类别SCI
WOS记录号WOS:000251391800036
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5627
专题理论物理所SCI论文
通讯作者Li, C , Dalian Univ Technol, Dept Phys, Dalian 116024, Peoples R China
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Li Chong,Gao Yi-Bo,Li, C , Dalian Univ Technol, Dept Phys, Dalian 116024, Peoples R China. 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.
APA Li Chong,Gao Yi-Bo,&Li, C , Dalian Univ Technol, Dept Phys, Dalian 116024, Peoples R China.(2007).On effectiveness of protocol creating maximum entanglement of two charge-phase qubits by cavity field.COMMUNICATIONS IN THEORETICAL PHYSICS,48(5),935-942.
MLA Li Chong,et al."On effectiveness of protocol creating maximum entanglement of two charge-phase qubits by cavity field".COMMUNICATIONS IN THEORETICAL PHYSICS 48.5(2007):935-942.
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