nt - p h / 07 01 10 5 v 1 1 6 Ja n 20 07 Observation of ultra - broadband , beamlike parametric downconversion
نویسنده
چکیده
We report spontaneous parametric downconversion having an unusually wide spectral bandwidth. A collinear type-1 phase-matching configuration is employed with degeneracy near the zero group velocity dispersion frequency. With a spectral width of 1080 nm and degenerate wavelength 1885 nm, the source also emits a high flux of 3.4×10 sW photon pairs constrained to a cone of only ≈2◦ half-angle. A rigorous theoretical approach is developed that confirms the experimental observations. The source properties are consistent with an ultra-short photon-pair correlation time and, for a narrowband pump, extremely high-dimensional spectral entanglement.
منابع مشابه
nt - p h / 01 01 07 1 v 1 1 6 Ja n 20 01 MAXIMUM - LIKELIHOOD METHOD IN QUANTUM ESTIMATION
The maximum-likelihood method for quantum estimation is reviewed and applied to the reconstruction of density matrix of spin and radiation as well as to the determination of several parameters of interest in quantum optics.
متن کاملua nt - p h / 02 01 08 6 v 1 1 9 Ja n 20 02 Entanglement between external degrees of freedom of atoms via Bragg deflection
We suggest that atoms undergoing Bragg deflection from a cavity field introduce entanglement between their external degrees of freedom. The atoms interact with an electromagnetic cavity field which is far detuned from atomic transition frequency and is in superposition state. We provide a set of experimental parameters in order to perform the suggested experiment within the frame work of the pr...
متن کاملnt - p h / 01 03 08 5 v 5 1 0 Ja n 20 02 Darwinism in quantum systems ?
We investigate the role of quantum mechanical effects in the central stability concept of evolutionary game theory i.e. an Evolutionarily Stable Strategy (ESS). Using two and three-player symmetric quantum games we show how the presence of quantum phenomenon of entanglement can be crucial to decide the course of evolutionary dynamics in a population of interacting individuals.
متن کاملar X iv : q ua nt - p h / 01 01 14 7 v 1 3 1 Ja n 20 01 Radiation Trapping Radiation trapping in coherent media
We show that the effective decay rate of Zeeman coherence, generated in a 87 Rb vapor by linearly polarized laser light, increases significantly with the atomic density. We explain this phenomenon as the result of radiation trapping. Our study shows that radiation trapping must be taken into account to fully understand many electromagnetically induced transparency experiments with optically thi...
متن کاملar X iv : q ua nt - p h / 04 11 02 9 v 1 4 N ov 2 00 4 A high - yield single photon source using gated spontaneous parametric down conversion
The construction of a single photon source using gated parametric fluorescence is reported with the measurement results of the photon number distribution. A beamlike twin-photon method is used in order to achieve high collection efficiency. The estimated probability P (1) to find a single photon in a collimated output pulse is 26.5 % at a repetition rate of 10 kHz when the effective quantum eff...
متن کامل