Spatial and spectral coherence in propagating high-intensity twin beams

Haderka, Ondřej; Machulka, Radek; Peřina, Jan; Allevi, Alessia; Bondani, Maria

doi:10.1038/srep14365

Cited by 9 publications

(5 citation statements)

References 20 publications

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“…The number of TWB modes in the radial direction was determined by the Fedorov ratio 35 defined as the ratio between the radial signal-field intensity width and the width of radial intensity cross-correlation function. On the other hand, as the fields’ spectral widths were not measured, the intensity auto-correlation function 18 33 42 was used to quantify the number of spectral modes ( ).…”

Section: Methodsmentioning

confidence: 99%

Internal dynamics of intense twin beams and their coherence

Peřina

Haderka

Allevi

et al. 2016

Sci Rep

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The dynamics of intense twin beams in pump-depleted parametric down-conversion is studied. A generalized parametric approximation is suggested to solve the quantum model. Its comparison with a semiclassical model valid for larger twin-beam intensities confirms its applicability. The experimentally observed maxima in the spectral and spatial intensity auto- and cross- correlation functions depending on pump power are explained in terms of different speeds of the (back-) flow of energy between the individual down-converted modes and the corresponding pump modes. This effect is also responsible for the gradual replacement of the initial exponential growth of the down-converted fields by the linear one. Furthermore, it forms a minimum in the curve giving the effective number of twin-beam modes. These effects manifest a tight relation between the twin-beam coherence and its internal structure, as clearly visible in the model. Multiple maxima in the intensity correlation functions originating in the oscillations of energy flow between the pump and down-converted modes are theoretically predicted.

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Section: Methodsmentioning

confidence: 99%

Internal dynamics of intense twin beams and their coherence

Peřina

Haderka

Allevi

et al. 2016

Sci Rep

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“…This first issue is addressed by considering that the medium interacts with a twin beam composed by a larger number of entangled photon pairs and generated by means of intense parametric down-conversion (PDC) [27,28,29]. Indeed, properties of such twin beams have been commonly investigated [30,31,32] and, more importantly, it has been shown that strong quantum frequency correlations inside the twin beam persist even at these higher photon-flux conditions as shown in [33] and also later in [34,35,36].…”

Section: Introductionmentioning

confidence: 99%

Two-photon absorption spectroscopy using intense phase-chirped entangled beams

2018

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We numerically analyze the use of intense entangled twin beams for ultrasensitive spectroscopic measurements in chemical and biological systems. The examined scheme makes use of intense frequency-modulated (chirped) entangled beams to successfully extract information about the intermediate material states that contribute to the two-photon excitation of an absorbing medium. Robustness of the presented method is examined with respect to the applied intervals of the frequency chirp.

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“…Interestingly, a similar method has been applied to characterize the intensity correlations in fiber optical solitons [73] and to get the spatiotemporal correlations [74,75]. Finally, there is another, quite elegant, method for the JSI reconstruction called the stimulated emission tomography [76,77].…”

Section: Measurement Of the Joint Spectral Intensity (Jsi)mentioning

confidence: 99%

Indefinite-Mean Pareto Photon Distribution from Amplified Quantum Noise

et al. 2019

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Extreme events appear in many physics phenomena, whenever the probability distribution has a 'heavy tail', differing very much from the equilibrium one. Most unusual are the cases of powerlaw (Pareto) probability distributions. Among their many manifestations in physics, from 'rogue waves' in the ocean to Lévy flights in random walks, Pareto dependences can follow very different power laws. For some outstanding cases the power exponents are less than 2, leading to indefinite mean values, let alone higher moments. Here we present the first evidence of indefinite-mean Pareto distribution of photon numbers at the output of nonlinear effects pumped by parametrically amplified vacuum noise, known as bright squeezed vacuum (BSV). We observe a Pareto distribution with power exponent 1.31 when BSV is used as a pump for supercontinuum generation, and other heavy-tailed distributions (however with definite moments) when it pumps optical harmonics generation. Unlike in other fields, we can flexibly control the Pareto exponent by changing the experimental parameters. This extremely fluctuating light is interesting for ghost imaging and quantum thermodynamics as a resource to produce more efficiently non-equilibrium states by single-photon subtraction, the latter we demonstrate experimentally.

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Spatial and spectral coherence in propagating high-intensity twin beams

Cited by 9 publications

References 20 publications

Internal dynamics of intense twin beams and their coherence

Internal dynamics of intense twin beams and their coherence

Two-photon absorption spectroscopy using intense phase-chirped entangled beams

Indefinite-Mean Pareto Photon Distribution from Amplified Quantum Noise

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