Two independent photon pairs versus four-photon entangled states in parametric down conversion

Authors:H De Riedmatten, V Scarani, I Marcikic, A Acin, W Tittel, H Zbinden, N Gisin
Journal:Journal of Modern Optics 51, 1637–1649 (2004)
DOI:http://dx.doi.org/10.1080/09500340310001654991
Abstract:We study the physics of four-photon states generated in spontaneous parametric down-conversion with a pulsed pump field. In the limit where the coherence time of the photons t©(ph) is much shorter than the duration of the pump pulse Deltat, the four photons can be described as two independent pairs. In the opposite limit, the four photons are in a four-particle entangled state. Any intermediate case can be characterized by a single parameter chi, which is a function of t©(ph)/Deltat. We present a direct measurement of chi through a simple experimental set-up. The full theoretical analysis is also provided.
File:jmodoptpublished.pdf

BibTeX Source

@ARTICLE{DeRiedmatten2004,
  author = {De Riedmatten, H. and Scarani, V. and Marcikic, I. and Acin, A. and
	Tittel, W. and Zbinden, H. and Gisin, N.},
  title = {Two independent photon pairs versus four-photon entangled states
	in parametric down conversion},
  journal = {Journal of Modern Optics},
  year = {2004},
  volume = {51},
  pages = {1637--1649},
  number = {11},
  abstract = {We study the physics of four-photon states generated in spontaneous
	parametric down-conversion with a pulsed pump field. In the limit
	where the coherence time of the photons t(c)(ph) is much shorter
	than the duration of the pump pulse Deltat, the four photons can
	be described as two independent pairs. In the opposite limit, the
	four photons are in a four-particle entangled state. Any intermediate
	case can be characterized by a single parameter chi, which is a function
	of t(c)(ph)/Deltat. We present a direct measurement of chi through
	a simple experimental set-up. The full theoretical analysis is also
	provided. },
  doi = {10.1080/09500340310001654991},
  owner = {cc},
  sn = {0950-0340},
  timestamp = {2010.08.20},
  ut = {WOS:000222181300005}
}