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Geometric Phase for a Qutrit-Qubit Mixed-Spin System |
| ZHANG Ai-Ping**, QIANG Wen-Chao, LING Ya-Wen, XIN Hong, YANG Yong-Ming
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Faculty of Science, Xi'an University of Architecture and Technology, Xi'an 710055
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ZHANG Ai-Ping, QIANG Wen-Chao, LING Ya-Wen et al 2011 Chin. Phys. Lett. 28 080301 |
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Abstract We study the geometric phase of a qutrit-qubit mixed-spin system in an external homogeneous magnetic field. Both the spin-spin interaction strength J and the external magnetic field B can affect the geometric phase of the system. In addition, we consider the negativity of the composite system. The relationship between the negativity and the geometric phase is obtained. Finally, we calculate the geometric phase for a thermal mixed state and show how the geometric phase depends on the rescaled coupling parameter and temperature. In the limit T→0, we can recover the result of the ground state. This analysis has some implications in realistic implementations of geometric quantum computation.
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| Keywords:
03.65.Vf
03.65.Ud
03.67.Pp
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Received: 12 March 2011
Published: 28 July 2011
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| PACS: |
03.65.Vf
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(Phases: geometric; dynamic or topological)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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03.67.Pp
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(Quantum error correction and other methods for protection against decoherence)
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