Quantum logic gates operation using SQUID qubits in bimodal cavity
Song Ke-Hui (宋克慧)
Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China; Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 23026, China
Abstract We present a scheme to realize the basic two-qubit logic gates such as the quantum phase gate and SWAP gate using a detuned microwave cavity interacting with three-level superconducting-quantum-interference-device (SQUID) qubit(s), by placing SQUID(s) in a two-mode microwave cavity and using adiabatic passage methods. In this scheme, the two logical states of the qubit are represented by the two lowest levels of the SQUID, and the cavity fields are treated as quantized. Compared with the previous method, the complex procedures of adjusting the level spacing of the SQUID and applying the resonant microwave pulse to the SQUID to create transformation are not required. Based on superconducting device with relatively long decoherence time and simplified operation procedure, the gates operate at a high speed, which is important in view of decoherence.
Received: 03 February 2005
Revised: 12 August 2005
Accepted manuscript online:
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