Method for universal detection of two-photon polarization entanglement

Karol Bartkiewicz; Paweł Horodecki; Karel Lemr; Adam Miranowicz; Karol Życzkowski

doi:10.1103/physreva.91.032315

Method for universal detection of two-photon polarization entanglement

Abstract

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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Authors (5)

Karol Bartkiewicz
- Uniwersytet Adama Mickiewicza Wydział Fizyki
Paweł Horodecki prof. dr hab.
Karel Lemr
- RCPTM Instytu Fizyki
Adam Miranowicz
- Uniwersytet Adama Mickiewicza Wydział Fizyki
Karol Życzkowski
- PAN Centrum Fizyki Teoretycznej

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DOI:: Digital Object Identifier (open in new tab) 10.1103/PhysRevA.91.032315
License: Copyright (2015 American Physical Society)

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Details

Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: PHYSICAL REVIEW A no. 91, edition 3, pages 1 - 7,
ISSN: 2469-9926
Language:: English
Publication year:: 2015
Bibliographic description:: 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:: Digital Object Identifier (open in new tab) 10.1103/physreva.91.032315
Verified by:: Gdańsk University of Technology