Quantum computation in a decoherence-free subspace with superconducting devices

作     者：Xue, Z. -Y. Zhu, S. L. Wang, Z. D. 

作者机构：Univ Hong Kong Dept Phys Hong Kong Hong Kong Peoples R China Univ Hong Kong Ctr Theoret & Computat Phys Hong Kong Hong Kong Peoples R China S China Normal Univ Lab Quantum Informat Technol ICMP Guangzhou 510006 Guangdong Peoples R China S China Normal Univ SPTE Guangzhou 510006 Guangdong Peoples R China 

出 版 物：《EUROPEAN PHYSICAL JOURNAL D》 (Eur. Phys. J. D)

年 卷 期：2009年第55卷第1期

页      面：223-228页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：RGC of Hong Kong [HKU7045/05P, HKU7049/07P, HKU7044/08P] NSFC [10429401, 10674049] State Key Program for Basic Research of China [2006CB921800, 2007CB925204] 

主　　题：Quantum computation architectures and implementations Quantum state engineering and measurements Josephson devices 

摘      要：We propose a scheme to implement quantum computation in decoherence-free subspace with superconducting devices inside a cavity by unconventional geometric manipulation. Universal single-qubit gates in encoded qubit can be achieved with cavity assisted interaction. A measurement-based two-qubit Controlled-Not gate is produced with parity measurements assisted by an auxiliary superconducting device and followed by prescribed single-qubit gates. The measurement of currents on two parallel devices can realize a projective measurement, which is equivalent to the parity measurement on the involved devices.