Unconventional geometric phase gate and multiqubit entanglement for hot ions with a frequency-modulated field

doi:10.1088/1674-1056/19/11/110310

Abstract We present an alternative scheme for implementing the unconventional geometric two-qubit phase gate and preparing multiqubit entanglement by using a frequency-modulated laser field to simultaneously illuminate all ions. Selecting the index of modulation yields selective mechanisms for coupling and decoupling between the internal and the external states of the ions. By the selective mechanisms, we obtain the unconventional geometric two-qubit phase gate, multiparticle Greenberger–Horne–Zeilinger states and highly entangled cluster states. Our scheme is insensitive to the thermal motion of the ions.

Keywords: a frequency-modulated field unconventional geometric phase gate Greenberger–Horne–Zeilinger states cluster states

Received: 14 October 2009
Revised: 01 July 2010
Accepted manuscript online:

PACS:	03.65.Ud	(Entanglement and quantum nonlocality)
	03.67.Lx	(Quantum computation architectures and implementations)
	42.50.Dv	(Quantum state engineering and measurements)
	42.60.Fc	(Modulation, tuning, and mode locking)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2005CB724508), the Scientific Research Foundation of Jiangxi Provincial Department of Education, China (Grant No. GJJ10133), and the Foundation of Talent of Jinggang of Jiangxi Province, China (Grant No. 2008DQ00400).

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Zhong Wen-Xue(钟文学), Cheng Guang-Ling(程广玲), and Chen Ai-Xi(陈爱喜) Unconventional geometric phase gate and multiqubit entanglement for hot ions with a frequency-modulated field 2010 Chin. Phys. B 19 110310

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Unconventional geometric phase gate and multiqubit entanglement for hot ions with a frequency-modulated field

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