Europhys. Lett.
Volume 66, Number 2, April 2004
Page(s) 157 - 163
Section General
Published online 01 April 2004
Europhys. Lett., 66 (2) , pp. 157-163 (2004)
DOI: 10.1209/epl/i2003-10206-0

Coherence protection by the Zeno effect

E. Brion1, G. Harel2, 3, N. Kebaili1, V. M. Akulin1 and I. Dumer4

1  Laboratoire Aime Cotton, CNRS II, Bâtiment 505 - 91405 Orsay Cedex, France
2  Spinoza Institute, Utrecht University Leuvenlaan 4, 3508 TD Utrecht, The Netherlands
3  Department of Computing, University of Bradford - Bradford BD7 1DP, UK
4  University of California - Riverside, CA 92521, USA

(Received 29 July 2003; accepted in final form 16 February 2004)

We show that multidimensional Zeno effect allows one to efficiently protect quantum systems from coherence loss by a method similar to classical coding. Contrary to the conventional approach, our method is applicable to arbitrary error-induced Hamiltonians and general quantum systems. We propose algorithms for finding the coherence-protecting codes along with a method of practical encoding by non-holonomic control. Two new single-error-correcting codes are constructed that surpass the bounds valid for classical quantum codes.

03.65.-w - Quantum mechanics.
03.67.Pp - Quantum error correction and other methods for protection against decoherence.
32.80.Qk - Coherent control of atomic interactions with photons.

© EDP Sciences 2004