Eur. Phys. J. D (2013) 67: 16
https://doi.org/10.1140/epjd/e2012-30392-9

Regular Article

Continuous dynamical protection of coherent evolutions of two distant atoms against atomic decay

School of Physics, Beijing Institute of Technology, Beijing 100081, P.R. China

^a e-mail: zoujian@bit.edu.cn

Received: 21 June 2012
Received in final form: 8 November 2012
Published online: 5 February 2013

Abstract

For two (two-level) atoms placed in distant cavities, which are connected by optical fibers, by using a few local continuous fields with frequencies sufficiently large as compared with the cutoff frequency of the environment, we can achieve low-order protection of non-local unitary evolutions and two classes of local unitary evolutions against atomic decay. Using these protected evolutions, we can prepare and protect an arbitrary state of two atoms in the presence of atomic decay. More importantly, we show that the universal gate operation can also be realized by combination of these evolutions against atomic decay.