The physics of thermal light second-order interference beyond coherence

Tamma, Vincenzo

doi:10.1088/1402-4896/aae71c

Cited by 6 publications

(3 citation statements)

References 56 publications

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“…As an extension to this work, we plan to do some time resolved measurements which will help investigate the temporal behaviour of the biomedical sensor, work to which has been in progress [32]. For this purpose, we plan to use an optical chopper or an electro-optic modulator [34] that may aid us in the analyze the sensor in short intervals of time. This is particularly important for the sake of spectral analysis of the sensor that will help us in the analysis of the samples of interest, and can be done with the help of an arrangement [35] that involves a beam splitter and a coherent source of laser light.…”

Section: Discussionmentioning

confidence: 99%

Calibration and stability of highly sensitive fibre based laser through relative intensity noise

Masud

Ali

Ikram³

2020

Phys. Scr.

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This work is concerned with the characterization of the fiber based laser sensor by means of relative intensity noise (RIN). The characterization has been done by an electrical based measurement system, which has been accomplished by the implementation of an optical receiver setup. The optical receiver setup has been built by using commercially available low noise amplifier (LNA), Bias Tee, and fast photodiode (FPD). Besides the optical receiver setup designing, software in Labview has been built and implemented to enable easy and fast measurement of data from measurement instruments. Using the self assembled optical receiver and an electrical spectrum analyzer (ESA), optical fluctuation ’noise’ of the fiber based laser sensor has been measured. We have found good agreement between the measurement results taken by our measurement setup and costly Agilent RIN measurement setup. Also, average RIN over wide frequency range has been calculated and discussed for different operating states of the laser sensor. The results are applicable in the field of an optical sensor.

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Section: Discussionmentioning

confidence: 99%

Calibration and stability of highly sensitive fibre based laser through relative intensity noise

Masud

Ali

Ikram³

2020

Phys. Scr.

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“…Interestingly, starting from the early 2000s, many of these effects have been replicated by exploiting the correlations of chaotic light [37][38][39][40][41][42][43][44][45][46]. Recently, novel schemes where second-order interference occurs effectively between light propagating through two pairs of paths that are mutually incoherent at first order have been proposed [47][48][49] and experimentally realized [50][51][52][53] in both the temporal and spatial domain.…”

Section: Introductionmentioning

confidence: 99%

Distance sensitivity of thermal light second-order interference beyond spatial coherence

et al. 2022

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We demonstrate the distance sensitivity of thermal light second-order interference beyond spatial coherence. This kind of interference, emerging from the measurement of the correlation between intensity fluctuations on two detectors, is sensitive to the distances separating a remote mask from the source and the detector, even when such information cannot be retrieved by first-order intensity measurements. We show how the sensitivity to such distances is intimately connected to the degree of correlation of the measured interference pattern in different experimental scenarios and independently of the spectral properties of light. Remarkably, in specific configurations, sensitivity to the distances of remote objects can be preserved even in the presence of turbulence. Unlike in previous schemes, such a distance sensitivity is reflected in the fundamental emergence of new critical parameters which benchmark the degree of second-order correlation, describing the counterintuitive emergence of spatial second-order interference not only in the absence of (first-order) coherence at both detectors but also when first-order interference is observed at one of the two detectors.

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“…Interestingly, the second-order interference (SOI) of thermal light in two independent unbalanced interferometers beyond the photon coherence length has been theoretically and experimentally reported [14][15][16][17][18]. Although thermal photons are not energy-time entangled, this SOI beyond the coherence length in the Franson-type interferometry is a highly counterintuitive phenomenon [14,16].…”

Section: Introductionmentioning

confidence: 99%

Indistinguishability of Temporally Separated Pairwise Two- Photon State of Thermal Photons in Franson-Type Interferometry

Park

Kim

Moon

2021

Preprint

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The phenomenon of Franson interference with time–energy entangled photon pairs beyond the single-photon coherence length observed upon nonlocal measurement at two space-like separated locations is of particular research interest. Herein, we determine the coherence length of temporally separated pairwise two-photon (TSPT) states of thermal photons emitted from a warm atomic ensemble in Franson-type interferometry, with the setup consisting of two spatially separated unbalanced Michelson interferometers beyond the coherence length of a thermal photon. Using a novel method of square-modulated thermal photons, we show that the sinusoidal Franson-type interference fringe of thermal photons is determined by the presence or absence of TSPT states (corresponding to the time delay between the long and short paths in Franson-type interferometry). We find that the indistinguishability of the TSPT state in the Franson-type interference is independent of the temporal separation of the thermal photons in the TSPT states.

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The physics of thermal light second-order interference beyond coherence

Cited by 6 publications

References 56 publications

Calibration and stability of highly sensitive fibre based laser through relative intensity noise

Calibration and stability of highly sensitive fibre based laser through relative intensity noise

Distance sensitivity of thermal light second-order interference beyond spatial coherence

Indistinguishability of Temporally Separated Pairwise Two- Photon State of Thermal Photons in Franson-Type Interferometry

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