Quantum correlation between optical and terahertz photons generated under multimode spontaneous parametric down-conversion

Китаева, Г. Х.; Leontyev, A. A.; Prudkovskii, P. A.

doi:10.1103/physreva.101.053810

Cited by 13 publications

(3 citation statements)

References 24 publications

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“…Parametric down-conversion in bulk 0.9 cm Mg:LiNbO 3 crystal was excited in type-0 geometry. According to phase-matching conditions, the photons of ~1 THz frequency were most effectively generated in this sample at polar angles

with respect to pump direction [ 4 , 10 ]. THz part of PDC radiation was extracted from the crystal through its side face in immediate proximity to the pump beam [ 5 ].…”

Section: Methodsmentioning

confidence: 99%

“…Nowadays, a new direction in terahertz science begins, aimed to extend quantum optical technologies to the terahertz frequency range (THz) [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Currently developed for the optical range, the methods of quantum field sensing [ 12 , 13 , 14 ], imaging [ 15 , 16 ], spectroscopy [ 17 , 18 ], and calibration [ 19 , 20 ] potentially can have great prospects in THz.…”

Section: Introductionmentioning

confidence: 99%

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Towards Measuring Terahertz Photon Statistics by a Superconducting Bolometer

Prudkovskii

Leontyev

Кузнецов

et al. 2021

Sensors

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Statistical distributions of the analog readings of an antenna-coupled THz superconducting bolometer were measured and analyzed under a special type of irradiation by low-energy fluxes of THz photons with Poisson photon statistics and controllable mean photon numbers. The photons were generated via low-gain parametric down-conversion in pulse-pumped Mg:LiNbO3 crystal placed to a cooled cryostat together with the bolometer NbN film. Results of theoretical approximation of experimental histograms reveal the discrete nature of THz detection by superconducting bolometers and open a way for studying their quantum characteristics. It is shown that bolometer readings per pulse consist of discrete counts (“single charges”), with the mean number linearly dependent on the number of input photons. Contributions of single counts to a total analog reading are statistically distributed according to the normal law, with average values slightly depending on the number of counts in each reading. A general formula is proposed to describe the relationship between continuous statistical distribution of the bolometer readings and discrete quantum statistics of the incident photons.

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with respect to pump direction [ 4 , 10 ]. THz part of PDC radiation was extracted from the crystal through its side face in immediate proximity to the pump beam [ 5 ].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards Measuring Terahertz Photon Statistics by a Superconducting Bolometer

Prudkovskii

Leontyev

Кузнецов

et al. 2021

Sensors

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“…[1] In order to improve the optical conversion efficiency, the phase-matching conditions, including the birefringent phase matching (BPM) and quasi-phase-matching (QPM) were theoretically proposed and experimentally identified. [2][3][4][5] Nowadays, compared with those higher-order nonlinear responses under same irradiations, SHG, sum-frequency generation (SFG) and difference-frequency generation (DFG) can provide the efficient up-and down-conversion frequency conversion, thus becoming important ways for extending laser wavelengths DOI: 10.1002/lpor.202300664 covering deep-ultraviolet (DUV), [6][7][8] mid-infrared, [9,10] and even terahertz region, [11,12] with the efficiency up to a few to tens of percent. The cascading of SHG and SFG processes in several nonlinear crystals could realize the radiations of different photon energy, [13,14] the shortest wavelength located at DUV but with the disadvantages of low integration and high cost.…”

Section: Introductionmentioning

confidence: 99%

Cascaded Second Harmonic Generation for Deep‐UV Radiations with a 2D Nonlinear Photonic Quartz Crystal

Zhang,

Shao,

Liang

et al. 2024

Laser & Photonics Reviews

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Harmonic generation can broaden the laser wavelength in a great scope and is rich in physics, but the efficient cascaded second harmonic generation especially those directly deep into deep‐ultraviolet (DUV) with one single crystal seems to be impossible, due to the extremely strict phase‐matching conditions and relative narrow bandgap of present nonlinear optical crystals. Here, this work designs a nonlinear photonic quartz crystal where the phase difference of interacted light waves is manipulated in two dimensions and realizes an unprecedented cascaded phase‐matched 2nd–5th harmonic generation simultaneously with the photon energy up to 6 eV, representing the shortest wavelength by cascaded second harmonic generation in the solid‐state nonlinear medium. The generated light is located in the visible‐DUV region with a total conversion efficiency of 2.7%. The present nonlinear photonic quartz scheme not only provides a multi‐wavelength solid‐state laser source applied in modern devices but also develops a new route for studying the light‐matter nonlinear interaction in the DUV region.

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Azimuthal eigenmodes at strongly non-degenerate parametric down-conversion

Dvernik

Prudkovskii

2021

Appl. Phys. B

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Quantum-optical technologies based on the effect of parametric light downconversion are not yet applied in the terahertz frequency range. This is owing to the absence of terahertz single-photon detectors and the strong entanglement of modes of optical-terahertz biphotons. This study investigates the angular structure of scattered radiation generated by strongly non-degenerate parametric down-conversion. It demonstrates that under certain approximations, it is possible to obtain azimuthal eigenmodes for the nonlinear-interaction operator. The solution of the evolution equations for the field operators in these eigenmodes has the form of the Bogolyubov transformation, which allows a scattering matrix to be obtained for arbitrary values of the parametric gain. This scattering matrix can describe both the production of biphoton pairs and the generation of intense fluxes of correlated optical-terahertz fields that form a macroscopic quantum state of radiation in two spectral ranges.

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Quantum correlation between optical and terahertz photons generated under multimode spontaneous parametric down-conversion

Cited by 13 publications

References 24 publications

Towards Measuring Terahertz Photon Statistics by a Superconducting Bolometer

Towards Measuring Terahertz Photon Statistics by a Superconducting Bolometer

Cascaded Second Harmonic Generation for Deep‐UV Radiations with a 2D Nonlinear Photonic Quartz Crystal

Azimuthal eigenmodes at strongly non-degenerate parametric down-conversion

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