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Quantum Gate Operations in Decoherence-Free Subspace with Superconducting Charge Qubits inside a Cavity |
| WANG Yi-Min, ZHOU Yan-Li, LIANG Lin-Mei, LI Cheng-Zu |
| Department of Physics, National University of Defense Technology, Changsha 410073 |
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WANG Yi-Min, ZHOU Yan-Li, LIANG Lin-Mei et al 2009 Chin. Phys. Lett. 26 100304 |
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Abstract We propose a feasible scheme to achieve universal quantum gate operations in decoherence-free subspace with superconducting charge qubits placed in a microwave cavity. Single-logic-qubit gates can be realized with cavity assisted interaction, which possesses the advantages of unconventional geometric gate operation. The two-logic-qubit controlled-phase gate between subsystems can be constructed with the help of a variable electrostatic transformer. The collective decoherence can be successfully avoided in our well-designed system. Moreover, GHZ state for logical qubits can also be easily produced in this system.
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| Keywords:
03.67.Lx
42.50.Pp
85.25.Cp
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Received: 01 April 2009
Published: 27 September 2009
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