Europhys. Lett.
Volume 65, Number 1, January 2004
Page(s) 1 - 6
Section General
Published online 01 December 2003
Europhys. Lett., 65 (1) , pp. 1-6 (2004)
DOI: 10.1209/epl/i2003-10053-y

Coherently manipulating two-qubit quantum information using a pair of simultaneous laser pulses

L. F. Wei1, 2 and F. Nori1, 3

1  Frontier Research System, The Institute of Physical and Chemical Research (RIKEN) - Wako-shi, Saitama, 351-0198, Japan
2  Institute of Quantum Optics and Quantum Information, Department of Physics Shanghai Jiaotong University - Shanghai 200030, PRC
3  Center for Theoretical Physics, Physics Department Center for the Study of Complex Systems, The University of Michigan Ann Arbor, MI 48109-1120, USA

(Received 6 May 2003; accepted in final form 28 October 2003)

Several sequential operations are usually needed for implementing controlled quantum gates and generating entanglement between a pair of quantum bits. Based on the conditional quantum dynamics for a two-ion system beyond the Lamb-Dicke limit, here we propose a theoretical scheme for manipulating two-qubit quantum information, i.e., implementing a universal two-qubit quantum gate and generating a two-qubit entangled state, by using a pair of simultaneous laser pulses. Neither the Lamb-Dicke approximation nor the auxiliary atomic level are required. The experimental realizability of this simple approach is also discussed.

03.67.Lx - Quantum computation.
32.80.Pj - Optical cooling of atoms; trapping.

© EDP Sciences 2004