Volume 66, Number 2, April 2004
|Page(s)||157 - 163|
|Published online||01 April 2004|
Coherence protection by the Zeno effect
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
Accepted: 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.
PACS: 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
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