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July 1989
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32 Reads
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82 Citations
Physical Review Letters
It is demonstrated in a photon coincidence experiment with two photodetectors, in which signal and idler photons produced by parametric down-conversion are allowed to interfere, that the visibility of the interference pattern is well above 50% and remains unchanged when one of the two light beams is attenuated ninefold compared with the other. These results violate classical probability for light waves.
April 1989
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11 Reads
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17 Citations
Physical review A, Atomic, molecular, and optical physics
The response of a phase-conjugate mirror (PCM) based on nondegenerate four-wave mixing to an incident photon wave packet has been calculated. In the monochromatic limit the phase-compensating property of the PCM, which makes the response independent of optical path length, is recovered. However, for a photon wave packet of nonzero bandwidth, the response of the PCM varies in a fairly complicated manner with the wave-packet length. In particular, the length of the pulse reflected from the PCM becomes independent of the length of the incident pulse for sufficiently short pulses.
January 1989
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15 Reads
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73 Citations
A new experimental procedure for determining the (second-order) coherence time of a light beam is described that is based on a combination of conventional interferometry with an intensity-correlation technique. It permits measurements of coherence times that are several orders of magnitude shorter than the resolving times of the detectors, which ordinarily limit correlation measurements. The validity of the method is demonstrated by an experiment in which the transverse fluorescent light from a dye laser is measured.
January 1989
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73 Reads
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72 Citations
American Journal of Physics
January 1989
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1 Read
A number of unusual optical interference effects have been observed that involve pairs of photons and cannot be understood or described in terms of classical electromagnetic waves. They include fourth-order interference of >50% visibility, which is unchanged when one of the beams is attenuated tenfold; measurement of the time interval between two photons with femtosecond accuracy; demonstration of phase memory in the two-photon down-conversion process due to vacuum entanglement.
January 1989
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1 Read
An analysis is presented of the interference between two photon pairs produced in the process of downconversion from two identical crystals, which are then mixed by beam splitters. Because the downconverted photons are entangled with the vacuum, they carry information about the phase of the pump field. As a result the two-photon detection probability is shown to depend on the phase of the pump, even when the resolving time of the detector electronics is far longer than the coherence time of the light.
December 1988
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8 Reads
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1 Citation
Optics News
December 1988
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12 Reads
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29 Citations
Optics Communications
We have observed beating between the blue (488 nm) and the green (514.5 nm) lines of an argon ion laser by use of a fourth order interference technique. The method involves the use of a Mach-Zehnder interferometer with photoelectric coincidence detection. The observed (approximately) 30 fs period of the beat note is far shorter than the time resolution of the detectors.
August 1988
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55 Reads
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271 Citations
Physical Review Letters
When signal and idler photons produced in the process of parametric down-conversion are mixed together and directed to two photodetectors that respond to nonoverlapping optical frequencies centered at omega1 and omega2, it is found that the joint probability of two-photon detection exhibits a modulation of the form cos(omega1-omega2)tau, where c(tau) is the path difference. The experimental results are well described by a simple quantum-mechanical analysis.
August 1988
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127 Reads
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948 Citations
Physical Review Letters
Correlation measurements of mixed signal and idler photons produced in the process of parametric down-conversion have been performed as a function of two linear polarizer settings. It is found that the Bell inequality for two separated particles is violated by about 6 standard deviations, and that classical probability for light waves is violated substantially also.
... Our beamsplitter is designed to be symmetric [36] (also see Fig. S1(c)) so the beamsplitter transformations, with reflection coefficient η, are ...
January 1989
American Journal of Physics
... However, if the photons are indistinguishable, they will necessarily pair together; they will never be found in different ports. The latter case is often referred to as the HOM effect [220] and plays a central role in quantum information processing [219], particularly in the engineering and analysis of entangled states in quantum photonics. ...
January 1987
... ae¾º j*' *çj &G~V *B ô Ï>î . [1][2][3][4][5]7] ã¾ç~ 7 ¶3f f Ë~ .&7" jF; î~ ç^·ÏöB B~, jF; îöB ö .ae ...
December 1988
Optics News
... On the other hand, a phase-dependent fourth-order interference effect occurs in Franson interferometer [7], which consists of two highly imbalanced interferometers beyond coherence length [8][9][10]. But it was shown that the effect exists only for two-photon quantum fields and disappears for stationary classical fields in time-unresolved coincidence measurement [11]. The progress on the interference with imbalanced paths was halted until recently when it was reported that phase dependent fourthorder interference between two thermal fields can appear in the time-resolved coincidence between two detectors even when the path imbalance of the interferometer is well beyond the coherence length of the fields [12,13]. ...
October 1990
... One alternative is the generation of photonic entanglement by mode-mixing of a pair of single photons on a beam-splitter (see Fig. 1). This has been proposed [17,18] and later experimentally realized with pair of photons from a non-linear process [19,20]. Later, single photons from individual emitters were entangled [21][22][23]. ...
May 1987
Physics Letters A
... It relies on measuring intensity correlations of light like in the intensity interferometry technique introduced by Hanbury Brown and Twiss (HBT) (33). The HBT method and its generalizations were applied to a variety of light sources (34)(35)(36)(37)(38)(39)(40)(41)(42), and similarly, our technique might be applied in various scenarios including, for instance, laser and thermal light. ...
January 1989
... The nonlinear optical process of parametric downconversion (PDC) has been extensively employed to generate quantum states of light structured in the transverse spatial degrees of freedom [1]. In the classical regime, the same process can be operated in the stimulated emission mode (StimPDC) [2,3], providing a convenient platform for the design of quantum optical schemes [4][5][6], and for the study of the interplay between the spatial structures of the interacting light fields in the parametric process [7][8][9][10][11]. In the same way, parametric upconversion plays an important role in a wide variety of applications in quantum and classical optical schemes, as, for instance, frequency conversion of squeezed light fields [12,13] and imaging with visible and invisible light [14,15]. ...
February 1990
... It was shown early on that the space-frequency correlation function of cross-spectrally pure fields is independent of the frequency of the input spectra of light [10]. Cross-spectral purity has been studied in various scenarios, such as squeezed light, three-dimensional fields, ghost imaging, and scattering [11][12][13]. In recent years, cross-spectral purity has been extended to vector (or electromagnetic) fields [14][15][16][17][18][19], as well as nonstationary scalar [20,21] and nonstationary electromagnetic light [22][23][24]. ...
October 1987
... If we consider electromagnetic waves from two independent optical emitters without a phase relationship, any first-order interference washes out when detector electronics are too slow to trace rapidly fluctuating electric fields [1]. However, correlation measurements can recover interference effects, in particular when time-resolved single photon detectors are used [2][3][4][5]. ...
December 1988
Optics Communications
... Among them, the design of beam splitter, which splits incident wave into multiple parts with the same or different intensities, is quite demanding, it has potential applications in optical circuits and communications [1]. In the past, many researchers have considered the behavior of the quantum-mechanical beam splitter [11][12][13][14][15][16][17][18][19]. While the 1 × 2 optical splitters are used routinely (say for instance, Y-and T-branch junctions) [20], the rapidly growing need for space-division multiplexing in optical transmission [21], computing [22] and sensing networks [23] translates into the need for multi-port splitters [24]. ...
July 1987
Optics Communications
