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## Quantum Information Transmission with Topological Edge States

Superconducting heterostructures can host subgap states known as Andreev bound states. In topological superconducting systems, novel zero-energy Andreev states were discovered known as Majorana zero modes. Local Majorana zero modes serve as basic ingredients of topological quantum computations. To simplify manipulations, one can use chiral Majorana-fermion edge transport in gapped two-dimensional systems. Here we demonstrate how this approach can be used with continuous-spectrum edge Majorana in the Kitaev honeycomb model and discuss quantum-state transmission along the edge and its fidelity, using auxiliary external qubits as edge probes.

Dmitriy S. Shapiro, Lozovik Y., Погосов В. В. et al., Physical Review A: Atomic, Molecular, and Optical physics 2019 Vol. 99 No. 6 P. 063821

The analysis of single-mode photon fluctuations and their counting statistics at the superradiant phase transition is presented. The study concerns the equilibrium Dicke model in a regime where the Rabi frequency, related to a coupling of the photon mode with a finite-number qubit environment, plays the role of the transition's control parameter. We use the ...

Added: November 25, 2019

Dmitriy S. Shapiro, Sergey V. Remizov, Lebedev A. et al., Physical Review A: Atomic, Molecular, and Optical physics 2022 Vol. 105 No. 2 Article 023321

A dimerized fermion chain, described by Su-Schrieffer-Heeger (SSH) model, is a well-known example of a one-dimensional system with a nontrivial band topology. An interplay of disorder and topological ordering in the SSH model is of great interest owing to experimental advancements in synthesized quantum simulators. In this paper, we investigate a special sort of a ...

Added: July 26, 2023

Shapiro D. S., Pogosov W. V., Lozovik Y., Physical Review A: Atomic, Molecular, and Optical physics 2020 Vol. 102 No. 2 Article 023703

In view of recent proposals for the realization of anisotropic light-matter interaction in such platforms as (i) nonstationary or inductively and capacitively coupled superconducting qubits, (ii) atoms in crossed fields, and (iii) semiconductor heterostructures with spin-orbital interaction, the concept of a generalized Dicke model, where coupling strengths of rotating wave and counter-rotating wave terms are ...

Added: October 31, 2021

Ilya S., Grigoriy M., Moskalenko I. et al., Physical Review Applied 2024 Vol. 21 No. 4 P. 0

The Toffoli gate takes a special place in the quantum information theory. It opens up a path for efficient
implementation of complex quantum algorithms. Despite tremendous progress of the quantum processors
based on the superconducting qubits, realization of a high-fidelity three-qubit operation is still a challenging
problem. Here, we propose a way to perform a high-fidelity CCZ gate ...

Added: April 24, 2024

Bastrakova M. V., Klenov N. V., A. M. Satanin, Journal of Physics: Conference Series 2019 Vol. 1163 Article 012076

A numerical method of simulations for the evolution operators (propagators) of coupled qubits was developed on the basis of Magnus representation. The propagator of a multi-qubit system can be expressed by a N × N matrix whose size increases as N = 2^n with the number of qubits n . Therefore, the standard approach to ...

Added: February 26, 2020

Zybtsev S., Pokrovskii V., Nasretdinova V. et al., Journal of Alloys and Compounds 2021 Vol. 854 Article 157098

We report on high temperature (T) studies of conductivity, s, of the monoclinic phase of NbS3 (NbS3-II). The compound is shown to be stable up to T~550 K. Threshold non-linear conductivity and Shapiro steps on the I e V curves can be seen up to TP0 z 450 e 475 K clearly demonstrating sliding of a charge- density wave (CDW). The feature in s(T) shows that TP0 is ...

Added: October 28, 2021

Денисенко М. В., Кленов Н. В., Сатанин А. М., Journal of Physics: Conference Series 2018 Vol. 1124 P. 051027-1-051027-5

Simulation of the entangled (Bell) states generation of two qubits by using of unipolar picoseconds pulses was performed. As an example, a system of two coupled superconducting flux qubits interacting with fluxons that integrated with a Josephson transmission line has been considered. The influence of the pulse shape and quantum noise on the accuracy of ...

Added: February 21, 2019

Денисенко М. В., Кленов Н. В., Сатанин А. М., Журнал экспериментальной и теоретической физики 2019 Т. 155 № 2 С. 258-276

Обсуждается задача об ускорении квантовых вычислений путем управления состояниями кубитов короткими униполярными импульсами с большой амплитудой. Предложен новый метод описания динамики кубитов, основанный на представлении Магнуса для оператора эволюции (пропагатора) кубитов, которое позволяет найти решение задачи квантового контроля вне рамок теории возмущений. Эволюция состояний многокубитной системы представлена как движение на специальной унитарной группе SU(N), подобное ...

Added: February 21, 2019

Backens S., Shnirman A., Makhlin Y. et al., Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 96 No. 19 P. 195402-1-195402-10

We analyse the control of Majorana zero-energy states by mapping the fermionic system onto a chain of Ising spins. Although the topological protection is lost for the Ising system, the mapping provides additional insight into the nature of the quantum states. By controlling the local magnetic field, one can separate the Ising chain into ferromagnetic ...

Added: October 22, 2017

Makhlin Y., Backens S., Shnirman A., Journal of Experimental and Theoretical Physics 2019 Vol. 129 No. 4 P. 733-737

We consider quantum logical gates on Majorana qubits implemented in chain structures of ordinary qubits, spins, or pseudospins. We demonstrate that one can implement a two-qubit operation via local manipulations, using an extra coupler spin in a T-junction geometry, so that this coupler spin remains disentangled from the qubit. Furthermore, we identify a set of ...

Added: December 14, 2019

Bastrakova M. V., Klenov N. V., A. M. Satanin, Journal of Experimental and Theoretical Physics 2020 Vol. 131 No. 4 P. 507-519

© 2020, Pleiades Publishing, Inc.Abstract: The conventional technique for controlling the states of individual qubits and quantum registers is based on the use of high-frequency modulated pulses whose carrier frequency is close to the transition frequency between the ground states of “artificial atoms” and “molecules” (the Rabi technique). In this paper, an alternative concept for ...

Added: October 26, 2022

Rozhansky I. V., Quang To D., Jaffrès H. et al., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 102 No. 4 Article 045428

The chiral tunneling asymmetry for the transmission through a semiconductor interface with spin-orbit coupling (SOC) and antiparallel magnetization is presented from the perspective of the transfer Hamiltonian approach. We explicitly show that the expression for the tunneling rate contains terms which are odd in the momentum along the interface thus contributing to the skew tunneling ...

Added: October 21, 2021

Makhlin Y., Backens S., Shnirman A., JETP Letters 2018 Vol. 108 No. 11 P. 779-780

Majorana zero modes can be simulated in structures based on spin or quasi-spin degrees of freedom,
e.g., Josephson-qubit chains. Braiding of Majorana degrees of freedom is realized using T -junctions supplied with an auxiliary spin (ancilla). Motivated by prospective experiments, we analyze the braiding in the spin representation, which provides the basis for the analysis of ...

Added: November 26, 2018

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

Загорский Д. Л., Долуденко И. М., Каневский В. М. et al., Известия РАН. Серия физическая 2021 Т. 85 № 8 С. 1088-1094

FeCo and FeNi alloyed nanowires (NW) were obtained by the matrix synthesis method: the effect of the
growth voltage and the effect of using a reference electrode were studied. It is shown that the composition of
FeNi nanowires strongly depends on the growth potential (with its increase, the bcc structure is changing into
fcc), and it is also ...

Added: November 12, 2021

Panina I., Balandin S., Tsarev A. et al., International Journal of Molecular Sciences 2023 Vol. 24 No. 2 P. 1

To date, a number of lantibiotics have been shown to use lipid II — a highly conserved peptidoglycan precursor in the cytoplasmic membrane of bacteria — as their molecular target. The α-component (Lchα) of the two-component lantibiotic lichenicidin (Lchα), previously isolated from the Bacillus licheniformis VK21 strain, seems to contain two putative lipid II binding ...

Added: February 21, 2023

Alfimov M., Litvinov A., Journal of High Energy Physics 2022 No. 01 Article 43

We study regularization scheme dependence of beta-function for sigma models with two-dimensional target space. Working within four-loop approximation, we conjecture the scheme in which the beta-function retains only two tensor structures up to certain terms containing zeta_3. Using this scheme, we provide explicit solutions to RG flow equation corresponding to Yang-Baxter- and lambda-deformed SU(2)/U(1) sigma ...

Added: February 1, 2022

Kuzmichev S. A., Kuzmicheva T. E., Tchesnokov S. N. et al., Journal of Superconductivity and Novel Magnetism 2016 Vol. 29 No. 4 P. 1111-1116

We present temperature dependences of the large and the small superconducting gaps measured directly by SnS-Andreev spectroscopy in various Fe-based superconductors and MgB2. The experimental L,S(T ) are wellfitted with a two-gap model based on Moskalenko and Suhl system of equations (supplemented with a BCS integral renormalization). From the fitting procedure, we estimate the key ...

Added: March 19, 2016

Orekhov M., Russian Journal of Physical Chemistry A 2021 Vol. 95 P. 2059-2064

Molecular dynamic models are created for properties of bivalent ions in organic solvents. It is shown that molecules of the considered solvents bound to ions via oxygen atoms. A theoretical model is developed that describes the ion coordination number. The coordination number in this model is determined by the ratio between the sizes of the ...

Added: October 14, 2021

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

M. : Faculty of Physics, MSU, 2017

The Low Temperature Physics Conference is an international event held every three years, under the auspices of the IUPAP through its Commission C5 on Low Temperature Physics. The aim of these conferences is to exchange information and views among the members of the international scientific community in the general field of Low Temperature Physics. It ...

Added: October 1, 2017