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## Determination of measurement fidelity for a superconducting photon-number resolving detector with micron-wide strips

Journal of Physics: Conference Series. 2021. Vol. 2086. No. 1. Article 012177.

We report a study of multiphoton detection fidelity (or accuracy) for sequential photon-number resolving detectors based on micron-wide superconducting strips. It was found that an increase in the width of the superconducting strips by a factor of 5 leads to an improvement in the measurement accuracy by more than a factor of 10.

Rabinovich D. S., Bobkova I.V., Bobkov A. M., Physical Review Research 2019 Vol. 1 No. 3 P. 033095-1-033095-7

The anomalous ground-state phase shift in superconductor/antiferromagnet/superconductor Josephson junctions in the presence of the Rashba spin-orbit coupling is predicted and numerically investigated. It is found to be a consequence of the uncompensated magnetic moment at the superconductor/antiferromagnet interfaces. The anomalous phase shift exhibits a strong dependence on the value of the spin-orbit coupling and the ...

Added: November 19, 2019

Azarevich A., Bogach A., Glushkov V. et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 103 No. 10 Article 104515

We have studied the normal and superconductive state characteristics (resistivity, Hall coefficient, heat capacity, and magnetization) of model strongly correlated electronic systems LuxZr1−xB12 with cooperative Jahn-Teller instability of the boron rigid cage and with dynamic charge stripes. It was found that these metals are s-wave dirty limit superconductors with a small mean free path of charge carriers l=5–140Å and with ...

Added: October 25, 2022

Golovchanskiy I. A., Abramov N. N., Vlasenko V. A. et al., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 106 No. 2 Article 024412

In this paper, we report the results of magnetic resonance spectroscopy of EuFe2As2 single crystals. We
observe magnetic resonance responses, which are attributed to antiferromagnetic resonances of the Eu sublattice
with orthorhombic crystal structure and with different orientations of twin domains relative to the external field.
We confirm the validity of the recently proposed spin Hamiltonian with anisotropic ...

Added: November 16, 2022

Bobkova I.V., Bobkov A. M., JETP Letters 2019 Vol. 109 No. 1 P. 61-62

Influence of a nonmagnetic surface on the density of states in a spin-split superconductor, which is realized on the basis of a S/F bilayer, is investigated. It is demonstrated that if the ferromagnet magnetization has a defect in the form of a domain wall in the vicinity of the surface, the superconducting density of states ...

Added: November 19, 2019

Pashin D., Bastrakova M., Arkady Satanin et al., AIP Conference Proceedings 2020 Vol. 2241 No. 020020 Article 020020

© 2020 Author(s).We theoretically study a nonlinear Josephson oscillator (Josephson junction) in the effective potential, which form is a result of a driving current. We first consider the phase dynamics in the classical regime and then explore the problem in the quantum regime by solving the energy eigenvalue problem. Here we are going to pay ...

Added: October 26, 2022

Sasaki A., Ikegaya S., Habe T. et al., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 101 No. 184501 P. 184501-1-184501-6

We study theoretically the Josephson effect between two two-band superconductors respecting time-reversal
symmetry, where we assume a spin-singlet s-wave pair potential in each conduction band. The superconducting
phase at the first band ϕ1 and that at the second band ϕ2 characterize a two-band superconducting state. We
consider a Josephson junction where an insulating barrier separates two such two-band ...

Added: October 8, 2020

Feigelman M., Ioffe L., Physical Review Letters 2018 Vol. 120 P. 037004-1-037004-6

Strongly disordered pseudogapped superconductors are expected to display arbitrarily high values of kinetic inductance close to the superconductor-insulator transition (SIT), which make them attractive for the implementation of large dissipationless inductance. We develop the theory of the collective modes in these superconductors and discuss associated dissipation at microwave frequencies. We obtain the collective mode spectra ...

Added: October 27, 2018

Golovchanskiy I., Abramov N. N., Stolyarov V. S. et al., Advanced Science 2019 Vol. 6 No. 16 P. 1900435-1-1900435-8

In this work, a class of metamaterials is proposed on the basis of ferromagnet/superconductor hybridization for applications in magnonics. These metamaterials comprise of a ferromagnetic magnon medium that is coupled inductively to a superconducting periodic microstructure. Spectroscopy of magnetization dynamics in such hybrid evidences formation of areas in the medium with alternating dispersions for spin ...

Added: October 31, 2019

A.G. Mal'shukov, Espedal C., Lange P. et al., Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 95 P. 054509(1)-054509(17)

We consider the spin-orbit-induced spin Hall effect and spin swapping in diffusive superconductors.
By employing the non-equilibrium Keldysh Green’s function technique in the quasiclassical
approximation, we derive coupled transport equations for the spectral spin and particle distributions
and for the energy density in the elastic scattering regime. We compute four contributions to
the spin Hall conductivity, namely, skew scattering, ...

Added: February 6, 2019

Dryazgov M., Yu. Korneeva, A. Korneev, Physical Review Applied 2023 Vol. 19 No. 3 Article 034067

We report the development of photon-number-resolving superconducting single-photon detector with micron-scale NbN strips. The detector is designed as serial meander-shaped strips with resistors connected in parallel to each strip. We investigate the performance of the detectors comprising of 5–14 strips with the widths in the range 0.3–1 μm and covering an area as large as ...

Added: May 13, 2023

Radkevich A., Semenov A. G., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 106 No. 9 Article 094505

We develop an explicitly gauge-invariant semiclassical approach to investigate the nonlinear response of superconductors to monochromatic terahertz radiation. We demonstrate that in clean superconductors charge conservation forbids nonlinear response to a uniform field. We apply our approach to quasi-two-dimensional films and obtain an explicit expression for the photoinduced current. We find that the photoinduced current ...

Added: January 29, 2023

A.G. Mal'shukov, Physical Review B: Condensed Matter and Materials Physics 2016 Vol. 93 P. 054511(1)-054511(9)

A weak parallel Zeeman field combined with the spin-orbit coupling can induce the supercurrent in
an s-wave two-dimensional superconductor. At the same time, the thermodynamically equilibrium
state of such a system is characterized by the helix phase where the order parameter varies in space
as exp(iQr). In this state the electric current that is induced by the Zeeman ...

Added: February 6, 2019

Gaifullin R. R., Deminov R. G., Kushnir V. N. et al., Bulletin of the Russian Academy of Sciences: Physics 2023 Vol. 87 No. 4 P. 404-408

A matrix solution to Usadel linearized equations is used to obtain the critical temperature and distribution
of singlet pairing components of a superconductor/ferromagnetic/superconductor/ferromagnetic
structure with nonideal boundaries. There is a transition from the π- to the 0-phase state between the
superconductor layers upon varying the angle between the magnetizations of ferromagnetic layers in such
a structure. ...

Added: March 24, 2023

Gippius A. A., Gunbin A. V., Tkachev A. V. et al., Intermetallics 2023 Vol. 163 Article 108063

A comprehensive study of the intermetallic superconductor Mo8Ga41 was conducted by means of HRPXRD, abinitio calculations, NMR and NQR spectroscopy on 69Ga and 71Ga nuclei, as well as tunneling spectroscopy. All experimental methods used demonstrated the presence of an inherent surface superconducting phase in addition to the bulk superconducting phase. For the latter, the s-wave ...

Added: April 9, 2024

Korneeva Y., Manova N. N., Dryazgov M. et al., Superconductor Science and Technology 2021 Vol. 34 No. 8 Article 084001

We report our study of detection efficiency (DE) saturation in wavelength range 400–1550 nm for the NbN superconducting microstrip single-photon detectors (SMSPDs) featuring the strip width up to 3 µm. We observe an expected decrease of the DE saturation plateau with the increase of photon wavelength and decrease of film sheet resistance. At 1.7 K temperature ...

Added: September 20, 2021

Nashaat M., Bobkova I.V., Bobkov A. M. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 No. 5 P. 054506-1-054506-7

Strong dependence of the Josephson energy on the magnetization orientation in Josephson junctions with ferromagnetic interlayers and spin-orbit coupling opens a way to control magnetization by Josephson current or Josephson phase. Here we investigate the perspectives of magnetization control in superconductor/ferromagnet/superconductor (S/F/S) Josephson junctions on the surface of a 3D topological insulator hosting Dirac quasiparticles. ...

Added: November 19, 2019

A.G. Mal'shukov, Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 95 P. 064517-1-064517-11

The spin-galvanic (inverse Edelstein) and inverse spin-Hall effects are calculated for a hybrid
system that combines thin superconductor and Rashba-metal layers. These effects are produced by
a nonequilibrium spin polarization which is injected into the normal metal layer. This polarization
gives rise to an electric potential that relaxes within some characteristic length, which is determined
by the Andreev reflection. ...

Added: February 6, 2019

A.G. Mal'shukov, Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 98 P. 054504-1-054504-7

The Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction of magnetic impurities in a superconductor exponentially decreases when the distance between them is larger than the superconductor's coherence length, because this interaction is mediated by quasiparticles, which have a gap in their energy spectrum. At the same time, the spin-singlet superconducting condensate was always assumed to stay neutral to magnetic ...

Added: February 6, 2019

Rabinovich D. S., Bobkova I.V., Bobkov A. M. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 99 No. 21 P. 214501-1-214501-12

We demonstrate that the hybrid structures consisting of a superconducting layer with an adjacent spin-textured ferromagnet demonstrate the variety of equilibrium magnetoelectric effects originating from coupling between the conduction electron spin and superconducting current. By deriving and solving the generalized Usadel equation, which takes into account the spin-filtering effect, we find that a supercurrent generates ...

Added: November 19, 2019

Katushkina O. A., Quemerais E., Izmodenov V.V. et al., JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2017 Vol. 122 No. 11 P. 10921-10937

In this work, we present for the first time the Lyman α intensities measured by Voyager 1/UVS in 2003–2014 (at 90–130 AU from the Sun). During this period Voyager 1 measured the Lyman α emission in the outer heliosphere at an almost fixed direction close to the upwind (i.e.“ toward the interstellar flow). The data show an unexpected behavior in 2003–2009: the ...

Added: January 26, 2018

Aaij R., Abdelmotteleb A. S., Abellan Beteta C. et al., The European Physical Journal C - Particles and Fields 2023 Vol. 83 Article 543

https://link.springer.com/article/10.1140/epjc/s10052-023-11673-x#Abs1 ...

Added: December 4, 2023

Ружицкая Д. Д., САМОЙЛЕНКО А. А., Иванов А. Д. et al., Optoelectronics, Instrumentation and Data Processing 2017 Vol. 54 No. 1 P. 1-8

This paper presents an algorithm for processing the transmission spectra of whisperinggallery optical microcavities for use as a nanoparticle detector. The algorithm is based on the broadening of the microcavity resonance curve during precipitation of nanoparticles on the microcavity surface. Experimental results on the detection of particles are compared with Langmuir adsorption theory. The contribution ...

Added: May 25, 2018

М. : National Instruments Russia, 2017

Содержание сборника составляют доклады с результатами оригинальных исследований и технических решений, ранее не публиковавшиеся. Мы надеемся, что предлагаемый сборник окажется полезным для специалистов, работающих в различных областях науки и техники, для широкого круга преподавателей, аспирантов и студентов ВУЗов, а также для преподавателей средних школ и технических колледжей. ...

Added: May 10, 2017

Min Namkung, Younghun K., Scientific Reports 2018 Vol. 8 No. 1 P. 16915-1-16915-18

Sequential state discrimination is a strategy for quantum state discrimination of a sender’s quantum
states when N receivers are separately located. In this report, we propose optical designs that can
perform sequential state discrimination of two coherent states. For this purpose, we consider not
only binary phase-shifting-key (BPSK) signals but also general coherent states, with arbitrary prior
probabilities. Since ...

Added: November 16, 2020