Statistical mixtures of states can be more quantum than their superpositions: Comparison of nonclassicality measures for single-qubit states

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F15%3A33154207" target="_blank" >RIV/61989592:15310/15:33154207 - isvavai.cz</a>
Result on the web
<a href="http://journals.aps.org/pra/pdf/10.1103/PhysRevA.91.042309" target="_blank" >http://journals.aps.org/pra/pdf/10.1103/PhysRevA.91.042309</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevA.91.042309" target="_blank" >10.1103/PhysRevA.91.042309</a>

Result language
angličtina
Original language name
Statistical mixtures of states can be more quantum than their superpositions: Comparison of nonclassicality measures for single-qubit states
Original language description
A bosonic state is commonly considered nonclassical (or quantum) if its Glauber-Sudarshan P function is not a classical probability density, which implies that only coherent states and their statistical mixtures are classical. We quantify the nonclassicality of a single qubit, defined by the vacuum and single-photon states, by applying the following four well-known measures of nonclassicality: (1) the nonclassical depth, tau, related to the minimal amount of Gaussian noise which changes a nonpositive Pfunction into a positive one; (2) the nonclassical distance D, defined as the Bures distance of a given state to the closest classical state, which is the vacuum for the single-qubit Hilbert space; together with (3) the negativity potential (NP), and (4)concurrence potential, which are the nonclassicality measures corresponding to the entanglement measures (i.e., the negativity and concurrence, respectively) for the state generated by mixing a single-qubit state with the vacuum on a bal
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
BH - Optics, masers and lasers
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

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

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