Using unitary operations to preserve quantum states in the presence of relaxation
Quantum Physics
2007-05-23 v1
Abstract
When a quantum system interacts with an external environment, it undergoes the loss of quantum correlation (decoherence) and the loss of energy (relaxation) and eventually all of the quantum information becomes classical. Here we show a general principle to use unitary operations to establish and preserve particular non-equilibrium states in arbitrary relaxing quantum systems. We elucidate these concepts with examples of state preservation in one-spin and two-spin entangled systems.
Keywords
Cite
@article{arxiv.quant-ph/0210078,
title = {Using unitary operations to preserve quantum states in the presence of relaxation},
author = {Benjamin Recht and Yael Maguire and Seth Lloyd and I. L. Chuang and N. A. Gershenfeld},
journal= {arXiv preprint arXiv:quant-ph/0210078},
year = {2007}
}
Comments
4 pages, 2 figures, RevTex4