Unconventional Geometric Phase-Shift Gates Based on Superconducting Quantum Interference Devices Coupled to a Single-Mode Cavity |
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Authors: | SONG Ke-Hui ZHOU Zheng-Wei GUO Guang-Can |
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Institution: | Key Laboratory of Quantum Communication and Quantum Computation, University of Science and Technology of China, Hefei 230026, China;Department of Electronic Information Science and Physics, Huaihua University, Huaihua 418008, China Key Laboratory of Quantum Communication and Quantum Computation, University of Science and Technology of China, Hefei 230026, China Key Laboratory of Quantum Communication and Quantum Computation, University of Science and Technology of China, Hefei 230026, China |
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Abstract: | We present a scheme to realize geometric phase-shift gate for two superconducting quantum interference device (SQUID) qubits coupled to a single-mode microwave field. The geometric phase-shift gate operation is performed transitions during the gate operation. Thus, the docoherence due to energy spontaneous emission based on the levels of SQUIDs are suppressed. The gate is insensitive to the cavity decay throughout the operation since the cavity mode is displaced along a circle in the phase space, acquiring a phase conditional upon the two lower flux states of the SQUID qubits, and the cavity mode is still in the original vacuum state. Based on the SQUID qubits interacting with the cavity mode, our proposed approach may open promising prospects for quantum logic in SQUID-system. |
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Keywords: | geometric phase-shift gate superconducting quantum interference device cavity-QED |
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