38 research outputs found
Coherence Conservation of a Qubit Coupled to a Thermal Dissipating Environment
It is shown that quantum coherence is conserved in a principal system in the
case that the system is coupled to a fast dissipating environment
[arXiv:0709.0562]. The phenomenon is called the quantum wipe effect. Here, this
effect is reviewed and the analytical proof for a model system consisting of a
one-qubit system coupled to a fast dissipating environment is extended to an
environment at a thermal equilibrium.Comment: 7 pages, 3 figure
Population-only decay map for n-qubit n-partite inseparability detection
We introduce a new positive linear map for a single qubit. This map is a
decay only in populations of a single-qubit density operator. It is shown that
an n-fold product of this map may be used for a detection of n-partite
inseparability of an n-qubit density operator (i.e., detection of impossibility
of representing a density operator in the form of a convex combination of
products of density operators of individual qubits). This product map is also
investigated in relation to a variant of the entanglement detection method
mentioned by Laskowski and Zukowski.Comment: 5 pages, 1 figure, RevTex4, v2 minor grammatical changes, typos
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