Intense spectrally broad-band twin beams from poled nonlinear crystals

Peřina, Jan

doi:10.1038/s41598-018-33546-0

Cited by 4 publications

(2 citation statements)

References 47 publications

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“…In the regime with pump depletion, ultra-intense TWBs containing both chaotic (multi-mode thermal) and coherent components are predicted 40 . The generation of ultra-intense TWBs in poled nonlinear crystals was also addressed 41 .…”

Section: Introductionmentioning

confidence: 99%

Waves in spatio-spectral and -temporal coherence of evolving ultra-intense twin beams

Peřina

2019

Sci Rep

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Waves in the spatio-spectral and -temporal coherence of evolving ultra-intense twin beams are predicted: Twin beams with low intensities attain maximal coherence in the beam center until certain threshold intensity is reached. Then the area of maximal coherence moves with increasing intensity from the beam center towards its edges leaving the beam center with low coherence (the first coherence wave). For even larger intensities, a new coherence maximum is gradually built in the beam center with the increasing intensity and, later, it again moves towards the beam edges forming the second coherence wave. Rotationally-symmetric twin beams are analyzed within a three-dimensional model that couples spectral and spatial degrees of freedom. Relation between the twin-beam coherence and its local density of modes during the nonlinear evolution is discussed.

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Section: Introductionmentioning

confidence: 99%

Waves in spatio-spectral and -temporal coherence of evolving ultra-intense twin beams

Peřina

2019

Sci Rep

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“…High-gain parametric down-conversion (PDC) in aperiodically poled crystals leads to the generation of bright squeezed vacuum twin beams with massively broadened spectra. Such twin beams are of considerable interest for quantum photonics and quantum information, due to their multimode structure, ultrashort correlation times and, most importantly, non-classical features such as broadband squeezing (1)(2)(3). Bright squeezed vacuum is a macroscopic quantum object exhibiting photon-number entanglement (4) and suitable for quantum metrology.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Mach–Zehnder interferometer with ultrabroadband squeezed light

Horoshko

Kolobov

Gumpert

et al. 2019

Journal of Modern Optics

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We study both theoretically and experimentally the interference pattern in a nonlinear Mach-Zehnder interferometer formed by two aperiodically-poled crystals, where broadband squeezed light is generated by both crystals via parametric down-conversion with a common quasimonochromatic pump. This configuration is important for measuring the squeezing produced by the first crystal and also for measuring a small phase shift introduced by a sample between the crystals. On the basis of the approximate quantum Rosenbluth formula for each crystal we develop an analytic model for the field evolution in the interferometer. We report an experimental observation of the interference fringes, caused by the dispersion of the generated PDC waves in both crystals forming the interferometer. We observe a displacement of the interference pattern caused by a sample between the crystals and infer the phase shift within a band of 20 nm. The experimental data are in a good agreement with the predictions of the developed model, up to imperfections of the samples.

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Bloch-Messiah reduction for twin beams of light

et al. 2019

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We study the Bloch-Messiah reduction of parametric downconversion of light in the pulsed regime with a nondegenerate phase matching providing generation of twin beams. We find that in this case every squeezing eigenvalue has multiplicity at least two. We discuss the problem of ambiguity in the definition of the squeezing eigenmodes in this case and develop two approaches to unique determination of the latter. First, we show that the modal functions of the squeezing eigenmodes can be tailored from the Schmidt modes of the signal and idler beams. Alternatively, they can be found as a solution of an eigenvalue problem for an associated Hermitian squeezing matrix. We illustrate the developed theory by an example of frequency non-degenerate collinear twin beams generated in beta barium borate crystal. On this example we demonstrate how the squeezing eigenmodes can be approximated analytically on the basis of the Mehler's formula, extended to complex kernels. We show how the multiplicity of the eigenvalues and the structure of the eigenmodes are changed when the phase matching approaches the degeneracy in frequency. arXiv:1903.06578v2 [quant-ph]

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Intense spectrally broad-band twin beams from poled nonlinear crystals

Cited by 4 publications

References 47 publications

Waves in spatio-spectral and -temporal coherence of evolving ultra-intense twin beams

Waves in spatio-spectral and -temporal coherence of evolving ultra-intense twin beams

Nonlinear Mach–Zehnder interferometer with ultrabroadband squeezed light

Bloch-Messiah reduction for twin beams of light

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