Open AccessExperimental characterization of two spatial qutrits using entanglement witnesses
Author(s) -
A. J. Gutiérrez-Esparza,
W. M. Pimenta,
Breno Marques,
A. A. Matoso,
S. Pádua
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.026351
Subject(s) - quantum entanglement , beam splitter , superposition principle , physics , qutrit , entanglement witness , quantum mechanics , observable , spontaneous parametric down conversion , photon entanglement , optics , characterization (materials science) , quantum metrology , squashed entanglement , quantum , laser , quantum network
We present an experimental technique for a complete characterization of entanglement in a two-qutrit state generated using transverse spatial correlations of two parametric down-converted photons. We verify entanglement for a particular case via entanglement witness operators which are decomposed into a sum of local observables of single path and superposition projection operators. Experimentally, these operators are accomplished by using a spatial light modulator and a polarizing beam splitter which allow to modulate the amplitude of individually chosen path states. The quantification of entanglement is computed by the negativity obtained from the expectation values of the entanglement witnesses implemented.