Fast Measurements of Entangled Photons

Author

Wang, Shan X. ; Moraw, P. ; Reilly, D.R. ; Altepeter, Joseph B. ; Kanter, G.S.

Author_Institution

NuCrypt, LLC, Evanston, IL, USA

Volume

31

Issue

5

fYear

2013

fDate

1-Mar-13

Firstpage

707

Lastpage

714

Abstract

We report on a system for the generation and measurement of polarization entangled photons. High speed quantum state tomographies with a raw fidelity of >; 91 % with respect to an ideal entangled state are recorded in <; 2 seconds, with longer-term accidental-count subtracted fidelities exceeding 99%. Two-photon interference measurements are recorded using an automated alignment and measurement procedure with the signal distributed over 20 km of fiber. These high speed measurement methods are useful for high rate monitoring of entangled states.

Keywords

light interference; light polarisation; multiphoton processes; quantum entanglement; automated alignment; distance 20 km; high speed measurement methods; high speed quantum state tomographies; ideal entangled state; polarization entangled photons; two-photon interference measurements; Logic gates; Loss measurement; Optical fiber devices; Optical fiber polarization; Photonics; Quantum entanglement; Tomography; Quantum entanglement; optical polarization; optical signal detection;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2012.2231854

Filename

6374627