Characterization and measurement of qubit-environment-entanglement generation during pure dephasing

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10315851" target="_blank" >RIV/00216208:11320/15:10315851 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevA.92.032310" target="_blank" >http://dx.doi.org/10.1103/PhysRevA.92.032310</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevA.92.032310" target="_blank" >10.1103/PhysRevA.92.032310</a>

Result language
angličtina
Original language name
Characterization and measurement of qubit-environment-entanglement generation during pure dephasing
Original language description
We consider the coupling of a qubit in a pure state to an environment in an arbitrary state and characterize the possibility of qubit-environment-entanglement generation during the evolution of the joint system, that leads to pure dephasing of the qubit.We give a simple necessary and sufficient condition on the initial density matrix of the environment together with the properties of the interaction for the appearance of qubit-environment entanglement. Any entanglement created turns out to be detectable by the Peres-Horodecki criterion. Furthermore, we show that for a large family of initial environmental states, the appearance of nonzero entanglement with the environment is necessarily accompanied by a change in the state of the environment (i.e., bythe backaction of the qubit).
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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