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Title: An environment-mediated quantum deleter
Authors: Srikanth, R.
Banerjee, Subhashish
Keywords: Quantum computation
No-deleting theorem
System–bath interaction
Quantum non-demolition interaction
Weak Born–Markov type of interaction
Quantum information
Issue Date: 30-Jul-2007
Publisher: Elsevier B.V.
Citation: Physics Letters A, 2007, Vol.367, p295-299
Abstract: 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 dephasing, 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.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0375-9601
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Copyright: 2007 Elsevier B.V.
Appears in Collections:Research Papers (LAMP)
Research Papers (TP)

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