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Open Quantum Systems Decoherence Entanglement Theory Quantum Correlations

Limits on the Observable Dynamics of Mixed States

arXiv

Authors: Cael Hasse

Year

2012

Paper ID

8611

Status

Preprint

Abstract Read

~2 min

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Abstract

It is shown that the observability of a large class of operations on mixed states is fundamentally limited. We consider trace preserving, unital operations. This class includes unitary and perfect premeasurement operations. An upper bound on the trace distance between an untransformed state and a state transformed by one of these operations is derived. The bound is dependent only on the purity of the state. In the case of maximal mixedness, the bound implies all operations of this class are unobservable.

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It is shown that the observability of a large class of operations on mixed states is fundamentally limited.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1206.3012 [2] arXiv https://arxiv.org/abs/1206.3012 [3] Publisher https://arxiv.org/abs/1206.3012

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