Controlled teleportation of qubit states: Relation between teleportation faithfulness, controller's authority, and tripartite entanglement

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F19%3A73594824" target="_blank" >RIV/61989592:15310/19:73594824 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.aps.org/pra/pdf/10.1103/PhysRevA.99.012306" target="_blank" >https://journals.aps.org/pra/pdf/10.1103/PhysRevA.99.012306</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevA.99.012306" target="_blank" >10.1103/PhysRevA.99.012306</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Controlled teleportation of qubit states: Relation between teleportation faithfulness, controller's authority, and tripartite entanglement

Popis výsledku v původním jazyce

We consider the controlled quantum teleportation performed on a single copy of entangled three-qubit pure states and show how the fidelity of teleportation and the control power are related to the tripartite entanglement measures, namely, three-tangle and genuine concurrence. We characterize the states with extreme properties, and use them to derive tight lower and upper bounds on both the teleportation fidelity and control power for a given amount of entanglement. Furthermore, we discuss the usefulness of these two quantities for experimental detection and/or quantification of tripartite entanglement. In particular, we present the results which imply that the control power cannot be considered as a candidate for a degree of three-qubit entanglement complementary to the three-tangle as conjectured recently [K. Jeong, J. Kim, and S. Lee, Phys. Rev. A 93 , 032328 (2016)]. Furthermore, we prove a mutual relation between teleportation fidelity and control power which provides attainable limits of the controller&apos;s authority for existing controlled teleportation schemes. Although those relations are derived for pure states, their extensions for mixed states are also examined.

Název v anglickém jazyce

Controlled teleportation of qubit states: Relation between teleportation faithfulness, controller's authority, and tripartite entanglement

Popis výsledku anglicky

We consider the controlled quantum teleportation performed on a single copy of entangled three-qubit pure states and show how the fidelity of teleportation and the control power are related to the tripartite entanglement measures, namely, three-tangle and genuine concurrence. We characterize the states with extreme properties, and use them to derive tight lower and upper bounds on both the teleportation fidelity and control power for a given amount of entanglement. Furthermore, we discuss the usefulness of these two quantities for experimental detection and/or quantification of tripartite entanglement. In particular, we present the results which imply that the control power cannot be considered as a candidate for a degree of three-qubit entanglement complementary to the three-tangle as conjectured recently [K. Jeong, J. Kim, and S. Lee, Phys. Rev. A 93 , 032328 (2016)]. Furthermore, we prove a mutual relation between teleportation fidelity and control power which provides attainable limits of the controller&apos;s authority for existing controlled teleportation schemes. Although those relations are derived for pure states, their extensions for mixed states are also examined.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review A

ISSN

2469-9926

e-ISSN

—

Svazek periodika

99

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

"012306-1"-"012306-9"

Kód UT WoS článku

000455050600002

EID výsledku v databázi Scopus

2-s2.0-85059810248