Two-photon anticorrelation is observed when laser and pseudothermal light beams are incident to the two input ports of a Hong-Ou-Mandel interferometer, respectively. The spatial second-order interference pattern of laser and pseudothermal light beams is reported. Temporal Hong-Ou-Mandel dip is also observed when these two detectors are at the symmetrical positions. These results are helpful to understand the physics behind the second-order interference of light. Ever since the second-order interference of light was first observed by Hanbury Brown and Twiss (HBT) in 1956 [1], it has been an important tool to study the properties of light [2]. The second-order interference of light has been studied with photons emitted by different kinds of sources, such as entangled photon pair source [3], two independent single-photon sources [4-6], laser and single-photon source [7], laser and entangled photon pair source [8], two lasers [9-11], two thermal sources [12-17], etc. Many interesting results were obtained from those studies. For instance, Hong et al. were able to measure the time separation between two photons with time resolution millions of times shorter than the resolution of the detector and the electronics [3, 18]. Pittman et al. got the ghost image of an object with entangled pho-ton pairs [19]. Bennett et al. observed Hong-Ou-Mandel (HOM) dip by feeding photons emitted by single-photon source and laser into the two input ports of a HOM in-terferometer, respectively [7]. The second-order interference of photons coming from laser and thermal light beams seems to have not been studied, in which, something interesting may happen. In this letter, we will experimentally study the second-order interference of laser and pseudothermal light beams in a HOM interferometer, where two-photon anticorrelation and temporal HOM dip are observed when these two detectors are at the symmetrical positions. Two-photon anticorrelation is defined as the two-photon coincidence count probability is less than the accidental two-photon coincidence count probability, which is equal to the product of these two single-photon probabilities [20]. It is convenient to employ the normalized second-order coherence function or the degree of second-order coherence [21], g (2) (r 1 , t 1 ; r 2 , t 2) = G (2) (r 1 , t 1 ; r 2 , t 2) G (1) (r 1 , t 1)G (1) (r 2 , t 2) , (1) to discuss the second-order correlation of light. Where G (2) (r 1 , t 1 ; r 2 , t 2) is the second-order coherence function at space-time coordinates (r 1 , t 1) and (r 2 , t 2). G (1) (r 1 , t 1) and G (1) (r 2 , t 2) are the first-order coherence functions at (r 1 , t 1) and (r 2 , t 2), respectively [22]. When g (2) (r 1 , t 1 ; r 2 , t 2) is greater than 1, these two photon detection events are correlated. When g (2) (r 1 , t 1 ; r 2 , t 2) is equal to 1, these two events are independent. When g (2) (r 1 , t 1 ; r 2 , t 2) is less than 1, these two events are an-ticorrelated. In our experiments, we are able to observe two-photon anticorrelation when these two single-photon de...

This article reports an experimental demonstration on nondegenerate, two-color, biphoton ghost imaging which reproduced a ghost image with enhanced angular resolving power by means of a greater field of view compared with that of classical imaging. With the same imaging magnification, the enhanced angular resolving power and field of view compared with those of classical imaging are 1.25 : 1 and 1.16 : 1, respectively. The enhancement of angular resolving power depends on the ratio between the idler and the signal photon frequencies, and the enhancement of the field of view depends mainly on the same ratio and also on the distances of the object plane and the imaging lens from the two-photon source. This article also reports the possibility of reproducing a ghost image with the enhancement of the angular resolving power by means of a greater imaging amplification compared with that of classical imaging.SANJIT KARMAKAR AND YANHUA SHIH PHYSICAL REVIEW A 81, 033845 (2010)

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