Spectral properties of high-gain parametric down-conversion

Spasibko, Kirill Yu.; Iskhakov, T. Sh.; Chekhova, Maria V.

doi:10.1364/oe.20.007507

Cited by 59 publications

(52 citation statements)

References 26 publications

(39 reference statements)

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“…It becomes noticeable for a finite number of Schmidt modes, especially with the increase of the parametric gain, which leads to an increase in the 'conditional width'. A similar increase of the 'conditional width' at high-gain PDC was observed in the frequency domain [30] and more precisely measured in the angular one [32]. Our theory gives the same result; the spectral bandwidth of the coherent peak increases with the increase in the parametric gain ( figure 6(b)).…”

Section: Resultssupporting

confidence: 84%

“…The best agreement between the theory and experiment is obtained for GDD≈200 fs 2 . Furthermore, in order to take into account that the detection happens in wavelength-angular space, not in frequency-wavevector one, the calculated SFG spectra are corrected by the factor λ −4 in accordance with [29,30]. Both theoretical (blue dots) and experimental (green line) SFG spectra are shown in figure 4.…”

Section: Resultsmentioning

confidence: 99%

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Study of broadband multimode light via non-phase-matched sum frequency generation

et al. 2019

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We propose non-phase-matched sum frequency generation (SFG) as a method for characterizing broadband multimode light. Both the central wavelength and the bandwidth are in this case not limited by the phase matching condition. As an example, we consider bright squeezed vacuum (BSV) generated through high-gain parametric down conversion (PDC). In the spectrum of SFG from BSV, we observe the coherent peak and the incoherent background. We show that the ratio of their widths is equal to the number of frequency modes in BSV, which in the case of low-gain PDC gives the degree of frequency entanglement for photon pairs. By generating the sum frequency in the near-surface region of a nonlinear crystal, we increase the SFG efficiency and get rid of the modulation caused by chromatic dispersion, known as Maker fringes. This allows one to use non-phasematched SFG as a wavelength-independent autocorrelator. Furthermore, we demonstrate efficient non-phase-matched three-and four-frequency summation of broadband multimode light, hardly possible under phase matching. We show that the latter contains the coherent peak while the former does not.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Study of broadband multimode light via non-phase-matched sum frequency generation

et al. 2019

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“…The red circles are the experimental data, in agreement with the theoretical prediction (the blue line). As it was shown in [25], at high gain most of the photons are generated at the output part of the crystal, which leads to the broadening of the spectrum and therefore, to the reduction of the coherence time of the PDC radiation. If the HOM Figure 6.…”

Section: Methodsmentioning

confidence: 94%

Macroscopic Hong–Ou–Mandel interference

et al. 2013

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Quality of individual photons and their ability to interfere is traditionally tested by measuring the Hong-Ou-Mandel photon bunching effect. However, this phase insensitive measurement only tests the particle aspect of the quantum interference. Motivated by these limitations, we formulate a witness capable of recognizing both the quality and the coherence of two photons from a single set of measurements. We exploit the conditional nonclassical squeezing which is sensitive to both the quality of the single photons and their indistinguishability and we show that it can be used to directly reveal both the particle and the wave aspects of the quantum interference. Finally, we experimentally test the witness by applying it to a pair of independent single photons generated on demand. PACS numbers: 42.50.Xa, 42.50.Ar, 42.50.Dv, 42.50.Ex Quantum interference of individual photons is one of the fundamental keystones of quantum technology. The ability to recognize whether photons from different sources can interfere is therefore an important one. The basic tests use photon correlation measurements to ascertain presence of individual photons and two-photon bunching to verify their interference. The experimental test of the bunching effect traditionally employs the Hong-Ou-Mandel interference [1], in which the two individual photons are mixed on a balanced beam splitter and the resulting two mode field is measured by a pair of photon counters. The bunching manifests as the lack of coincidence counts-if the coincidence probability is below one half, the interference effect is nonclassical, i. e. incompatible with description using a mixture of classical waves or classical particles. Recent experiments for a wide range of experimental platforms safely observed low values of coincidence counts and thus demonstrated this fundamental nonclassical aspect [2]. For discrete variable quantum technology (DV) these features are sufficient. However, from the point of view of continuous variables (CV) and the more general framework of hybrid quantum technology [3-6], these experiments quantify only the particle nature of the interference and ignore the vacuum and the related phase sensitive aspects [7] of the photon bunched state. The full picture of two-photon interference can be obtained by replacing the photon counters with homodyne detection and performing a full tomography [8, 9]. The reconstructed density matrix can then be analyzed in order to visualize and evaluate the interference caused by the the indistinguishability. The drawback to this tomographic approach is that it can not be used as a direct witness. The tomographic reconstruction is a process combining information from many incompatible measurements in order to obtain not directly measurable quantities, such as off-diagonal elements of the density matrix. The elements of the reconstructed matrix contain, in principle, full information about the state. However, the information is practically limited due to unavailability of a complete set of measurement and the need to ...

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“…This immediately follows from the comparison of Eqs. (48) and (53) in the limit U mlq ≈ 1. Also, the numbers K the entanglement dimensionality K ω in the high-intensity limit (P p → ∞).…”

Section: Spectral and Temporal Properties Of Intense Twin Beamsmentioning

confidence: 97%

“…Recently, the first experimental investigations of ultraintense twin beams have been reported both for multimode [17,[44][45][46][47][48] as well as single-mode (bright squeezedvacuum states) fields [49]. The effects of pump-field depletion have been observed.…”

Section: Introductionmentioning

confidence: 99%

Coherence and dimensionality of intense spatiospectral twin beams

Peřina

2015

Phys. Rev. A

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Spatio-spectral properties of twin beams at their transition from low to high intensities are analyzed in parametric and paraxial approximations using the decomposition into paired spatial and spectral modes. Intensity auto-and cross-correlation functions are determined and compared in the spectral and temporal domains as well as the transverse wave-vector and crystal output planes. Whereas the spectral, temporal and transverse wave-vector coherence increases with the increasing pump intensity, coherence in the crystal output plane is practically independent on the pump intensity owing to the mode structure in this plane. The corresponding auto-and cross-correlation functions approach each other for larger pump intensities. Entanglement dimensionality of a twin beam is determined comparing several approaches.

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Spectral properties of high-gain parametric down-conversion

Cited by 59 publications

References 26 publications

Study of broadband multimode light via non-phase-matched sum frequency generation

Study of broadband multimode light via non-phase-matched sum frequency generation

Macroscopic Hong–Ou–Mandel interference

Coherence and dimensionality of intense spatiospectral twin beams

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