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Unconventional geometric quantum phase gates with two SQUIDs in a cavity |
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| Authors: | Li-Xin Xia Qiong-Tao Xie |
| Institution: | a Department of Physics, Henan University of Science and Technology, Luoyang,471003, China b Key Laboratory for Atomic and Molecular NanoSciences and Department of Physics, Tsinghua University, Beijing, 100084, China c Hunan University of Science and Engineering, Yongzhou, 425100, China d Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China |
| Abstract: | We present a potential scheme to implement two-qubit quantum phase gates through an unconventional geometric phase shift with two four-level SQUIDs in a cavity. The SQUID qubits undergo no transitions during the gate operation, while the cavity mode is displaced along a circle in the phase space, acquiring a geometric phase depending conditionally upon the SQUIDs’ states. Under certain conditions, the SQUID qubits are disentangled with the cavity mode and the SQUIDs’ states remain in their ground states during the gate operation, thus the gate is insensitive to both the SQUIDs’ “spontaneous emission” and the cavity decay. |
| Keywords: | 03 67 Lx 03 65 Ta 42 50 Dv |
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