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Method for universal detection of two-photon polarization entanglement

Abstrakt

Detecting and quantifying quantum entanglement of a given unknown state poses problems that are fundamentally important for quantum information processing. Surprisingly, no direct (i.e., without quantum tomography) universal experimental implementation of a necessary and sufficient test of entanglement has been designed even for a general two-qubit state. Here we propose an experimental method for detecting a collective universal witness, which is a necessary and sufficient test of two-photon polarization entanglement. It allows us to detect entanglement for any two-qubit mixed state and to establish tight upper and lower bounds on its amount. A different element of this method is the sequential character of its main components, which allows us to obtain relatively complicated information about quantum correlations with the help of simple linear-optical elements. As such, this proposal realizes a universal two-qubit entanglement test within the present state of the art of quantum optics. We show the optimality of our setup with respect to the minimal number of measured quantities.

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:
PHYSICAL REVIEW A nr 91, wydanie 3, strony 1 - 7,
ISSN: 1050-2947
Język:
angielski
Rok wydania:
2015
Opis bibliograficzny:
Bartkiewicz K., Horodecki P., Lemr K., Miranowicz A., Życzkowski K.: Method for universal detection of two-photon polarization entanglement// PHYSICAL REVIEW A. -Vol. 91, iss. 3 (2015), s.1-7
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1103/physreva.91.032315
Weryfikacja:
Politechnika Gdańska

wyświetlono 16 razy

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