One-step implementation of a multiqubit controlled-phase-flip gate

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Xiu-Min Lin,^1,2 Zheng-Wei Zhou,¹ Ming-Yong Ye,¹ Yun-Feng Xiao,¹ and Guang-Can Guo¹
¹Key Laboratory of Quantum Information, Department of Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China
²School of Physics and Optoelectronics Technology, Fujian Normal University, Fuzhou 350007, People's Republic of China

Received 28 October 2004; revised 7 March 2005; published 18 January 2006

Wepropose a scheme for implementing quantum computation with N atomstrapped in a single-sided cavity. In our scheme, a multiqubitcontrolled-phase-flip (MCPF) gate as well as a quantum controlled phaseflip gate is performed by only one step. The numericalsimulations show that the protocol is robust to practical noise.In addition, the scheme can also be extended to achieveother multiqubit controlled unitary gates, and implement MCPF gate onatoms trapped in different cavities.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.012323
DOI:	10.1103/PhysRevA.73.012323
PACS:	03.67.Lx; 42.50.Pq; 32.80.Qk 03.67.Lx Quantum computation 42.50.Pq Cavity quantum electrodynamics; micromasers 32.80.Qk Coherent control of atomic interactions with photons YEAR: 2006
KEYWORDS:	quantum gates, atom-photon collisions, protocols, quantum noise

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