Generalized sub-Poissonian states of two-beam fields

• Published in: Optics express Vol. 32; no. 1; p. 537
• Main Authors: Peřina, Jan, Thapliyal, Kishore, Haderka, Ondřej, Michálek, Václav, Machulka, Radek
• Format: Journal Article
• Language: English
• Published: United States 01.01.2024
• ISSN: 1094-4087; 1094-4087
• DOI: 10.1364/OE.511065

Two-beam states obtained by partial photon-number-resolving detection in one beam of a multi-mode twin beam are experimentally investigated using an intensified CCD camera. In these states, sub-Poissonian photon-number distributions in one beam are accompanied by sub-shot-noise fluctuations in the photon-number difference of both beams. Multi-mode character of the twin beam implying the beam nearly Poissonian statistics is critical for reaching sub-Poissonian photon-number distributions, which contrasts with the use of a two-mode squeezed vacuum state. Relative intensities of both nonclassical effects as they depend on the generation conditions are investigated both theoretically and experimentally using photon-number distributions of these fields. Fano factor, noise-reduction parameter, local and global nonclassicality depths, degree of photon-number coherence, mutual entropy as a non-Gaussianity quantifier, and negative quasi-distributions of integrated intensities are used to characterize these fields. Spatial photon-pair correlations as means for improving the field properties are employed. These states are appealing for quantum metrology and imaging including the virtual-state entangled-photon spectroscopy.