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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
Source PublicationCOMMUNICATIONS IN THEORETICAL PHYSICS
KeywordMacroscopic Quantum States Decoherence Computation Codes Bits
AbstractWe 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.
2007
ISSN0253-6102
Volume48Issue:5Pages:935-942
Subject AreaPhysics
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5627
Collection理论物理所科研产出_SCI论文
Corresponding AuthorLi, C , Dalian Univ Technol, Dept Phys, Dalian 116024, Peoples R China
Recommended Citation
GB/T 7714
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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