Abstract
A growing number of experiments make use of multiple pairs of photons generated in the process of spontaneous parametric down-conversion. We show that entanglement in unwanted degrees of freedom can adversely affect the results of these experiments. We also discuss techniques to reduce or eliminate spectral and spatial entanglement, and we present results from two-photon polarization-entangled source with almost no entanglement in these degrees of freedom. Finally, we present two methods for the generation of four-photon polarization-entangled states. In one of these methods, four-photon can be generated without the need for intermediate two-photon entanglement.
| Original language | English |
|---|---|
| Pages (from-to) | 1538-1545 |
| Number of pages | 8 |
| Journal | Journal of Modern Optics |
| Volume | 59 |
| Issue number | 17 |
| DOIs | |
| State | Published - 2012 |
Funding
This work was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Department of Energy. W.G. also acknowledges the Governments’ support in the publication of this paper under AFRL Contract No. F4HBKC1013G001. ISSN 0950–0340 print/ISSN 1362–3044 online This material is published by permission of Oak Ridge National Laboratory, operated by UT-Battelle, LLC for the US Department of Energy under Contract No. DE-AC05-00OR22725. The US Government retains for itself, and others acting on its behalf, a paid-up, non-exclusive, and irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government http://dx.doi.org/10.1080/09500340.2012.705342 http://www.tandfonline.com
Keywords
- down-conversion
- entanglement
- quantum optics