FIELD: physics.
SUBSTANCE: scheme for generating modified 3- and 4-mode GC states includes a pulsed laser, a beamsplitter, a delay line, and two optical parametric amplifiers. Diagonally polarised laser radiation is divided into two beams using a beamsplitter, which are then used to pump optical parametric amplifiers. In one of these amplifiers, a process of spontaneous parametric scattering is excited with the formation of two orthogonally spatially polarised modes with entangled bell states. Then one of the scattered beams is directed to the input of the second amplifier simultaneously with the pump pulse synchronized in time with the scattered pulse by means of the delay line. At the output of the second amplifier two spatial modes are formed, and in one of them a two-photon state is observed.
EFFECT: possibility of generating multiphoton states, the possibility of exchanging entanglements between sources.
6 cl, 5 dwg
