Title :
Three-photon creation in /spl chi//sup (3)/ mediated parametric downconversion
Author_Institution :
DERA, Malvern, UK
Abstract :
Summary form only given. The use of parametric down-conversion as a convenient source of correlated photon pairs dates back to the early 1970´s but it Was not until the late 1980´s and early 1990´s that these Sources were shown to be useful for fundamental studies of the phenomenon of two particle entanglement. In recent experiments three photon interference effects have been studied by entangling initially separate photons which has led on to demonstration of quantum teleportation and three photon entangle via GHz states. Due to the necessity for overlapping weak beams of randomly timed photon pairs the triple coincidence rates in these experiments is low. Furthermore the three-photon interference effects are post-selected from a product state of two-photon entanglements which opens the experiments to criticism from a local realistic viewpoint. An improved source would create entangled states of three photons directly in a way analogous to two-photon downconversion. This work extends the quantum theory of spontaneous two-photon downconversion in the presence of a /spl chi//sup (2)/ non-linearity to the three photon case based on the nonlinear susceptibility /spl chi//sup (3)/. The resulting gain is much lower and the efficiency for the three-photon creation process is small. However we show by simple arguments that the number of modes scale quadratically with bandwidth. This leaves us with the hope of detecting of order one three photon per second when phase matching.
Keywords :
multiphoton processes; nonlinear optical susceptibility; optical frequency conversion; optical parametric devices; optical phase matching; quantum optics; /spl chi//sup (2)/ non-linearity; /spl chi//sup (3)/ mediated parametric downconversion; GHz states; correlated photon pairs; nonlinear susceptibility; overlapping weak beams; parametric down-conversion; phase matching; quantum teleportation; quantum theory; randomly timed photon pairs; spontaneous two-photon downconversion; three photon case; three photon entangle; three photon interference effects; three-photon creation; three-photon creation process; three-photon interference effects; triple coincidence rates; two-photon downconversion; two-photon entanglements; Bandwidth; Computer hacking; Frequency conversion; Geometry; Interference; Interferometry; Quantum entanglement; Quantum mechanics;
Conference_Titel :
Quantum Electronics Conference, 2000. Conference Digest. 2000 International
Conference_Location :
Nice, France
Print_ISBN :
0-7803-6318-3
DOI :
10.1109/IQEC.2000.908080