ZhETF, Vol. 131,
p. 615 (April 2007)
(English translation - JETP,
Vol. 104, No. 4,
available online at www.springer.com
MODIFIED NONCLASSICAL COHERENT STATE: SQUEEZING, ANTIBUNCHING, SUB-POISSONIAN PHOTON STATISTICS, REALIZATION SCHEME WITH THE \chi (2)-NONLINEARITY, AND GENERATION OF A MACROSCOPIC ENTANGLED STATE
Received: August 17, 2006
The nonlinear χ (2) Mach - Zehnder interferometer is proposed as a device for conditional generation of a modified coherent nonclassical state. We show that the generated macroscopic state exhibits nonclassical effects, such as squeezing, photon antibunching, and sub-Poissonian statistics. The modified coherent state generates a macroscopic entangled state. The scheme works without the photon number resolving detection but requires high-efficiency photodetectors. We explain a mechanism of generation of the modified coherent nonclassical state.