Direct detection of super-thermal photon-number statistics in second-harmonic generation

Allevi, Alessia; Bondani, Maria

doi:10.1364/ol.40.003089

Cited by 26 publications

(18 citation statements)

References 16 publications

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“…In Section 2.1, we briefly report the well-known classical description of SHG focusing on the transformation of the statistics in the cases of coherent and chaotic light. In particular, we resume the results of a previous work by us, where, by applying a semiclassical approach, we have demonstrated [11] that the second-harmonic of a fundamental beam featuring multi-mode thermal statistics exhibits a more-than-thermal, namely superthermal, statistics. In Section 2.2, we approach the quantum model.…”

Section: Introductionmentioning

confidence: 60%

“…where L is the crystal length. Given the link between the incoming light intensity and the second-harmonic one in Equation 10, it is possible to find a relation between the two corresponding light distributions [11,14,15]. Upon writing Equation 10as…”

Section: Classical Regimementioning

confidence: 99%

“…Mandel's formula [16] provides the detected-photon distribution for the second-harmonic field [11], that is:…”

Section: Multithermal Statementioning

confidence: 99%

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Second Harmonic Revisited: An Analytic Quantum Approach

et al. 2019

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We address the second-harmonic generation process in a quantum frame. Starting with a perturbative approach, we show that it is possible to achieve a number of analytic results, ranging from the up-conversion probability to the statistical properties of the generated light. In particular, the moments and the correlations of the photon-number distribution of the second-harmonic light generated by any initial state are retrieved. When possible, a comparison with the results achieved with the classical regime is successfully provided. The nonclassicality of some benchmark states is investigated by inspecting the corresponding autocorrelation function.

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Section: Introductionmentioning

confidence: 60%

Section: Classical Regimementioning

confidence: 99%

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Second Harmonic Revisited: An Analytic Quantum Approach

et al. 2019

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“…Recently, we have shown that when the second-harmonic generation process is applied to the multi-mode thermal eld described by Eq. (1) the second-harmonic eld is characterised by a di erent statistics [14]. In particular, by using a classical approach it is possible to demonstrate that the photon-number distribution for detected photons is given by…”

Section: Super-thermal Statisticsmentioning

confidence: 99%

“…However, there are situations in which the values of F and g ( ) are not sensitive enough to distinguish between similar states. An example is given by the super-thermal states with a large number of modes [14]. In this case, a possible alternative measurement is given by the calculation of the photon-number correlations between the two outputs of a beam splitter at which the light under study has been divided.…”

Section: Super-thermal Statisticsmentioning

confidence: 99%

Super-thermal light for imaging applications

Allevi¹,

Cassina²,

Bondani³

2017

Quantum Measurements and Quantum Metrology

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Abstract:We report on a new classical light source useful for ghost-imaging applications. The light is obtained by frequency doubling a conventional speckle pattern having an overall multi-mode thermal distribution. The frequency-doubled light acquires a super-thermal distribution, which induces higher correlations at a beam splitter and, as a consequence, a higher visibility in ghostimaging protocols.

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Modelocked Thermal Frequency Combs for Ultrashort Chaotic Quantum Optics

Wakui,

Tsujimoto,

Kishimoto

et al. 2024

Adv Quantum Tech

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Modelocked thermal frequency combs (MTCs) are generated by employing spectrally narrowed amplified spontaneous emission (ASE) seeded into an electro‐optic frequency comb generator. The MTC emits 2‐ps duration ultrashort pulses at a repetition rate of 10 GHz. Autocorrelation of the MTC pulses confirms a reduced coherence time, ps, aligning with the narrowed bandwidth of the ASE seed. Intensity correlations of optically gated MTC pulses at a repetition rate of 250 MHz reveal nearly ideal thermal photon statistics with an experimental , yielding an intrinsic after background noise removal. As a practical application, second harmonic generation (SHG) is performed utilizing the optically gated MTC pulses as a pump and experimental intensity correlations, , are examined for the SH photons. An entire transition in , continuously changing from six to two by increasing the pump strength, agrees with the single‐mode analytical model. Furthermore, time‐resolved pulse height correlations allow to simultaneously acquire power variations in SHG and third harmonic generation against the pump. With the maximum peak intensity, , realized in a periodically poled waveguide for SHG, the demonstration highlights the potential for various applications in chaotic quantum optics experiments that necessitate ultrashort, high‐intensity, single‐spatiotemporal‐mode thermal pulses.

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Direct detection of super-thermal photon-number statistics in second-harmonic generation

Cited by 26 publications

References 16 publications

Second Harmonic Revisited: An Analytic Quantum Approach

Second Harmonic Revisited: An Analytic Quantum Approach

Super-thermal light for imaging applications

Modelocked Thermal Frequency Combs for Ultrashort Chaotic Quantum Optics

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