Generation of two-photon states with arbitrary degree of entanglement via nonlinear crystal superlattices

We demonstrate a general method of engineering the joint quantum state of photon pairs produced in spontaneous parametric downconversion (PDC). The method makes use of a superlattice structure of nonlinear and linear materials, in conjunction with a broadband pump, to manipulate the group delays of...

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Bibliographic Details
Published in:arXiv.org 2006-11
Main Authors: U'Ren, Alfred B, Erdmann, Reinhard K, de la Cruz-Gutierrez, Manuel, Walmsley, Ian A
Format: Article
Language:English
Subjects:
Broadband
Entanglement
Group delay
Photons
Superlattices
Online Access:Get full text
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Summary:We demonstrate a general method of engineering the joint quantum state of photon pairs produced in spontaneous parametric downconversion (PDC). The method makes use of a superlattice structure of nonlinear and linear materials, in conjunction with a broadband pump, to manipulate the group delays of the signal and idler photons relative to the pump pulse, and realizes a joint spectral amplitude with arbitrary degree of entanglement for the generated pairs. This method of group delay engineering has the potential of synthesizing a broad range of states including factorizable states crucial for quantum networking and states optimized for Hong-Ou-Mandel interferometry. Experimental results for the latter case are presented, illustrating the principles of this approach.
ISSN:2331-8422
DOI:10.48550/arxiv.0611018