期刊
PHYSICS LETTERS A
卷 367, 期 4-5, 页码 295-299出版社
ELSEVIER
DOI: 10.1016/j.physleta.2007.03.029
关键词
quantum computation; no-deleting theorem; system-bath interaction; quantum non-demolition interaction; weak born-markov type of interaction; quantum information; decoherence
Environment-induced decoherence presents a great challenge to realizing a quantum computer. We point out the somewhat surprising fact that decoherence can be useful, indeed necessary, for practical quantum computation, in particular, for the effective erasure of quantum memory in order to initialize the state of the quantum computer. The essential point behind the deleter is that the environment, by means of a dissipative interaction. furnishes a contractive map towards a pure state. We present a specific example of an amplitude damping channel provided by a two-level system's interaction with its environment in the weak Born-Markov approximation. This is contrasted with a purely dephasinga. non-dissipative channel provided by a two-level system's interaction with its environment by means of a quantum nondemolition interaction. We point out that currently used state preparation techniques, for example using optical pumping, essentially perform as quantum deleters. (c) 2007 Elsevier BX All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据