An environment-mediated quantum deleter
arXiv:quant-ph/0611263 · doi:10.1016/j.physleta.2007.03.029
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.
5 pages, 3 figures, to appear in Physics Letters A
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- A study of coherence based measure of quantumness in (non) Markovian channels
- Complementarity of Quantum Correlations in Cloning and Deleting of Quantum State
- Complementarity in atomic (finite-level quantum) systems: an information-theoretic approach
- Entanglement, intractability and no-signaling
- Gödel Incompleteness and the Black Hole Information Paradox
- No-signaling, intractability and entanglement
- Projective measurements under qubit quantum channels
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