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Straupe S.S.,Moscow State University | Ivanov D.P.,Moscow State University | Kalinkin A.A.,Zavoisky Physical Technical Institute | Bobrov I.B.,Moscow State University | And 3 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We report an experimental self-calibrating tomography scheme for entanglement characterization in high-dimensional quantum systems using Schmidt decomposition techniques. The self-tomography technique based on maximal likelihood estimation was developed for characterizing nonideal measurements in the Schmidt basis, allowing us to infer both Schmidt eigenvalues and detecting efficiencies. © 2013 American Physical Society.

Yoeun S.,Chonnam National University | Sukhanov A.,Zavoisky Physical Technical Institute | Han O.,Chonnam National University
Bioorganic Chemistry | Year: 2016

Rice allene oxide synthase-1 mutants carrying F92L, P430A or F92L/P430A amino acid substitution mutations were constructed, recombinant mutant and wild type proteins were purified and their substrate preference, UV–vis spectra and heme iron spin state were characterized. The results show that the hydroperoxide lyase activities of F92L and F92L/P430A mutants prefer 13-hydroperoxy substrate to other hydroperoxydienoic acids or hydroperoxytrienoic acids. The Soret maximum was completely red-shifted in P430A and F92L/P430A mutants, but it was partially shifted in the F92L mutant. ESR spectral data showed that wild type, F92L and P430A mutants occupied high and low spin states, while the F92L/P430A mutant occupied only low spin state. The extent of the red shift of the Soret maximum increased as the population of low spin heme iron increased, suggesting that the spectral shift reflects the high to low transition of heme iron spin state in rice allene oxide synthase-1. Relative to wild type allene oxide synthase-1, the hydroperoxide lyase activities of F92L and F92L/P430A are less sensitive to inhibition by imidazole with (13S or 9S)-hydroperoxydienoic acid as substrate and more sensitive than wild type with (13S)-hydroperoxytrienoic acid as substrate. Our results suggest that hydroperoxydienoic acid is the preferred substrate for the hydroperoxide lyase activity and (13S)-hydroperoxytrienoic acid is the preferred substrate for allene oxide synthase activity of allene oxide synthase-1. © 2016 Elsevier Inc.

Ivanshin V.A.,Kazan Federal University | Gataullin E.M.,Kazan Federal University | Sukhanov A.A.,Zavoisky Physical Technical Institute | Pfannenschmidt U.,University of Munster | Pottgen R.,University of Munster
Journal of Physics: Conference Series | Year: 2012

We report the electron spin resonance (ESR) measurements in the new phosphides YbRh6P4 and CeIr2P2. Details of preparation of both materials which proceeds by different techniques are given. Electronic spin-lattice relaxation (SLR) processes with an involvement of the first excited Stark sublevel of the Yb3+ ion with an energy Δ 82.1 K describe well a drastic broadening and vanishing of the ESR signal in YbRh6P4 above 10 K. The observed ESR behavior provides evidence for the relatively weak f-p hybridization effects in both phosphides in contrast to silicides YbRh2Si2 and YbIr2Si2. © Published under licence by IOP Publishing Ltd.

Kalachev A.,Texas A&M University | Kalachev A.,Zavoisky Physical Technical Institute | Kocharovskaya O.,Texas A&M University
Journal of Modern Optics | Year: 2011

Manipulating refractive index in time allows one to implement quantum storage in an extended resonant atomic system without recourse to inhomogeneous broadening of optical transitions or amplitude modulation of control fields, which when combined with other storage techniques provides the possibility to improve mode or channel capacity of optical storage devices. We discuss different methods of refractive index manipulation in the context of quantum storage applications, giving special attention to a simple frequency shift of an absorption structure relative to the resonant energy levels. We show that a linear modulation of refractive index in time without significant losses can be realized in doped solid-state materials such as Er 3+:Y 2SiO 5 crystal, to provide optical quantum storage. © 2011 Copyright Taylor and Francis Group, LLC.

Gimazov I.I.,Kazan Federal University | Talanov Y.I.,Zavoisky Physical Technical Institute
Magnetic Resonance in Solids | Year: 2015

The results of the electron spin resonance study of the La1−xCaxMnO3 manganite and the diphenyl-picrylhydrazyl thin films for the magnetic field parallel and perpendicular to plane of the films are presented. The temperature dependence of the demagnetizing field is obtained. The parameters of the Curie-Weiss law are estimated for the paramagnetic thin film. © Kazan Federal University (KFU).

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