Journal
PHYSICAL REVIEW A
Volume 86, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.86.023805
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Funding
- National Science Foundation [CHE-1058791]
- Chemical Sciences
- Geosciences and Biosciences Division
- Office of Basic Energy Sciences
- Office of Science
- US Department of Energy
- [CHE-0840513]
- Direct For Mathematical & Physical Scien [1058791] Funding Source: National Science Foundation
- Division Of Chemistry [1058791] Funding Source: National Science Foundation
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The coincidence rate in two detectors that register signal and idler photons in parametric down-conversion is calculated using a quantum description of the radiation field that extends the semiclassical theory to the resonance regime. The signal is given by a sum over paths in the joint field plus matter space, each involving a pair of sites (molecules) and six radiation field modes. It may not be factorized into amplitudes representing one-site, three-mode paths. All effects of multiple vacuum modes are accounted for by theses paths without adding a Langevin noise source. The molecular information is given by a time-ordered superoperator Green's function rather than the susceptibility chi((2)) used in the semiclassical theory.
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