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Pashin DS, Pikunov PV, Bastrakova MV, Schegolev AE, Klenov NV, Soloviev II. A bifunctional superconducting cell as flux qubit and neuron. Beilstein J Nanotechnol 2023; 14:1116-1126. [PMID: 38034474 PMCID: PMC10682513 DOI: 10.3762/bjnano.14.92] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 11/01/2023] [Indexed: 12/02/2023]
Abstract
Josephson digital or analog ancillary circuits are an essential part of a large number of modern quantum processors. The natural candidate for the basis of tuning, coupling, and neromorphic co-processing elements for processors based on flux qubits is the adiabatic (reversible) superconducting logic cell. Using the simplest implementation of such a cell as an example, we have investigated the conditions under which it can optionally operate as an auxiliary qubit while maintaining its "classical" neural functionality. The performance and temperature regime estimates obtained confirm the possibility of practical use of a single-contact inductively shunted interferometer in a quantum mode in adjustment circuits for q-processors.
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Affiliation(s)
- Dmitrii S Pashin
- Faculty of Physics, Lobachevsky State University of Nizhni Novgorod, 603022 Nizhny Novgorod, Russia
| | - Pavel V Pikunov
- Faculty of Physics, Lobachevsky State University of Nizhni Novgorod, 603022 Nizhny Novgorod, Russia
| | - Marina V Bastrakova
- Faculty of Physics, Lobachevsky State University of Nizhni Novgorod, 603022 Nizhny Novgorod, Russia
- Russian Quantum Center, 143025 Skolkovo, Moscow, Russia
| | - Andrey E Schegolev
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
- Moscow Technical University of Communication and Informatics (MTUCI), 111024 Moscow, Russia
| | - Nikolay V Klenov
- Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
- National University of Science and Technology MISIS, 119049 Moscow, Russia
| | - Igor I Soloviev
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
- National University of Science and Technology MISIS, 119049 Moscow, Russia
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2
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Mikhin A, Rutckaia V, Savelev RS, Sinev IS, Alù A, Gorlach MA. Coherent Control of Topological States in an Integrated Waveguide Lattice. Nano Lett 2023; 23:2094-2099. [PMID: 36897096 PMCID: PMC10265707 DOI: 10.1021/acs.nanolett.2c04182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 03/06/2023] [Indexed: 06/17/2023]
Abstract
Topological photonics holds the promise for enhanced robustness of light localization and propagation enabled by the global symmetries of the system. While traditional designs of topological structures rely on lattice symmetries, there is an alternative strategy based on accidentally degenerate modes of the individual meta-atoms. Using this concept, we experimentally realize topological edge state in an array of silicon nanostructured waveguides, each hosting a pair of degenerate modes at telecom wavelengths. Exploiting the hybrid nature of the topological mode, we implement its coherent control by adjusting the phase between the degenerate modes and demonstrating selective excitation of bulk or edge states. The resulting field distribution is imaged via third harmonic generation showing the localization of topological modes as a function of the relative phase of the excitations. Our results highlight the impact of engineered accidental degeneracies on the formation of topological phases, extending the opportunities stemming from topological nanophotonic systems.
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Affiliation(s)
- Alexey
O. Mikhin
- School
of Physics and Engineering, ITMO University, Saint Petersburg 197101, Russia
| | - Viktoriia Rutckaia
- Photonics
Initiative, Advanced Science Research Center, The City University of New York, New York, New York 10031, United States
- Centre
for Innovation Competence SiLi-nano, Martin-Luther-University, Halle-Wittenberg, 06120 Halle (Saale), Germany
| | - Roman S. Savelev
- School
of Physics and Engineering, ITMO University, Saint Petersburg 197101, Russia
| | - Ivan S. Sinev
- School
of Physics and Engineering, ITMO University, Saint Petersburg 197101, Russia
| | - Andrea Alù
- Photonics
Initiative, Advanced Science Research Center, The City University of New York, New York, New York 10031, United States
- Physics
Program, Graduate Center, The City University
of New York, New York, New York 10016, United
States
| | - Maxim A. Gorlach
- School
of Physics and Engineering, ITMO University, Saint Petersburg 197101, Russia
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3
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Goetz C, Behar E, Beth A, Bodewits D, Bromley S, Burch J, Deca J, Divin A, Eriksson AI, Feldman PD, Galand M, Gunell H, Henri P, Heritier K, Jones GH, Mandt KE, Nilsson H, Noonan JW, Odelstad E, Parker JW, Rubin M, Simon Wedlund C, Stephenson P, Taylor MGGT, Vigren E, Vines SK, Volwerk M. The Plasma Environment of Comet 67P/Churyumov-Gerasimenko. Space Sci Rev 2022; 218:65. [PMID: 36397966 PMCID: PMC9649581 DOI: 10.1007/s11214-022-00931-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 10/20/2022] [Indexed: 06/04/2023]
Abstract
The environment of a comet is a fascinating and unique laboratory to study plasma processes and the formation of structures such as shocks and discontinuities from electron scales to ion scales and above. The European Space Agency's Rosetta mission collected data for more than two years, from the rendezvous with comet 67P/Churyumov-Gerasimenko in August 2014 until the final touch-down of the spacecraft end of September 2016. This escort phase spanned a large arc of the comet's orbit around the Sun, including its perihelion and corresponding to heliocentric distances between 3.8 AU and 1.24 AU. The length of the active mission together with this span in heliocentric and cometocentric distances make the Rosetta data set unique and much richer than sets obtained with previous cometary probes. Here, we review the results from the Rosetta mission that pertain to the plasma environment. We detail all known sources and losses of the plasma and typical processes within it. The findings from in-situ plasma measurements are complemented by remote observations of emissions from the plasma. Overviews of the methods and instruments used in the study are given as well as a short review of the Rosetta mission. The long duration of the Rosetta mission provides the opportunity to better understand how the importance of these processes changes depending on parameters like the outgassing rate and the solar wind conditions. We discuss how the shape and existence of large scale structures depend on these parameters and how the plasma within different regions of the plasma environment can be characterised. We end with a non-exhaustive list of still open questions, as well as suggestions on how to answer them in the future.
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Affiliation(s)
- Charlotte Goetz
- ESTEC, European Space Agency, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
- Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle-upon-Tyne, UK
| | - Etienne Behar
- Swedish Institute of Space Physics, Box 812, 981 28 Kiruna, Sweden
- Lagrange, OCA, UCA, CNRS, Nice, France
| | - Arnaud Beth
- Department of Physics, Umeå University, 901 87 Umeå, Sweden
| | - Dennis Bodewits
- Physics Department, Leach Science Center, Auburn University, Auburn, AL 36832 USA
| | - Steve Bromley
- Physics Department, Leach Science Center, Auburn University, Auburn, AL 36832 USA
| | - Jim Burch
- Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228-0510 USA
| | - Jan Deca
- Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, 3665 Discovery Drive, Boulder, CO 80303 USA
| | - Andrey Divin
- Earth Physics Department, St. Petersburg State University, Ulianovskaya, 1, St Petersburg, 198504 Russia
| | | | - Paul D. Feldman
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 USA
| | - Marina Galand
- Department of Physics, Imperial College London, Prince Consort Road, London, SW7 2AZ UK
| | - Herbert Gunell
- Department of Physics, Umeå University, 901 87 Umeå, Sweden
| | - Pierre Henri
- Lagrange, OCA, UCA, CNRS, Nice, France
- LPC2E, CNRS, Orléans, France
| | - Kevin Heritier
- Department of Physics, Imperial College London, Prince Consort Road, London, SW7 2AZ UK
| | - Geraint H. Jones
- UCL Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, RH5 6NT UK
- The Centre for Planetary Sciences at UCL/Birkbeck, Gower Street, London, WC1E 6BT UK
| | | | - Hans Nilsson
- Swedish Institute of Space Physics, Box 812, 981 28 Kiruna, Sweden
| | - John W. Noonan
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85719 USA
| | - Elias Odelstad
- Swedish Institute of Space Physics, Box 537, SE-751 21 Uppsala, Sweden
| | | | - Martin Rubin
- Physikalisches Institut, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
| | - Cyril Simon Wedlund
- Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042 Graz, Austria
| | - Peter Stephenson
- Department of Physics, Imperial College London, Prince Consort Road, London, SW7 2AZ UK
| | | | - Erik Vigren
- Swedish Institute of Space Physics, Box 537, SE-751 21 Uppsala, Sweden
| | - Sarah K. Vines
- Johns Hopkins Applied Physics Laboratory, Laurel, MD 20723 USA
| | - Martin Volwerk
- Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042 Graz, Austria
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4
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Khairulin IR, Radeonychev YV, Antonov VA, Kocharovskaya O. Acoustically induced transparency for synchrotron hard x-ray photons. Sci Rep 2021; 11:7930. [PMID: 33846377 PMCID: PMC8041895 DOI: 10.1038/s41598-021-86555-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Accepted: 03/17/2021] [Indexed: 12/05/2022] Open
Abstract
The induced transparency of opaque medium for resonant electromagnetic radiation is a powerful tool for manipulating the field-matter interaction. Various techniques to make different physical systems transparent for radiation from microwaves to x-rays were implemented. Most of them are based on the modification of the quantum-optical properties of the medium under the action of an external coherent electromagnetic field. Recently, an observation of acoustically induced transparency (AIT) of the 57Fe absorber for resonant 14.4-keV photons from the radioactive 57Co source was reported. About 150-fold suppression of the resonant absorption of photons due to collective acoustic oscillations of the nuclei was demonstrated. In this paper, we extend the AIT phenomenon to a novel phase-locked regime, when the transmitted photons are synchronized with the absorber vibration. We show that the advantages of synchrotron Mössbauer sources such as the deterministic periodic emission of radiation and controlled spectral-temporal characteristics of the emitted photons along with high-intensity photon flux in a tightly focused beam, make it possible to efficiently implement this regime, paving the way for the development of the acoustically controlled interface between hard x-ray photons and nuclear ensembles.
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Affiliation(s)
- I R Khairulin
- Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, 603950, Russia
- N. I. Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, 603950, Russia
| | - Y V Radeonychev
- Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, 603950, Russia.
- N. I. Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, 603950, Russia.
- Kazan Physical-Technical Institute, Russian Academy of Sciences, Kazan, 420029, Russia.
| | - V A Antonov
- Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, 603950, Russia
| | - Olga Kocharovskaya
- Department of Physics and Astronomy, Institute for Quantum Studies and Engineering, Texas A&M University, College Station, TX, 77843-4242, USA
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Komori S, Devine-Stoneman JM, Ohnishi K, Yang G, Devizorova Z, Mironov S, Montiel X, Olde Olthof LAB, Cohen LF, Kurebayashi H, Blamire MG, Buzdin AI, Robinson JWA. Spin-orbit coupling suppression and singlet-state blocking of spin-triplet Cooper pairs. Sci Adv 2021; 7:eabe0128. [PMID: 33523885 PMCID: PMC7806214 DOI: 10.1126/sciadv.abe0128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 11/17/2020] [Indexed: 06/12/2023]
Abstract
An inhomogeneous magnetic exchange field at a superconductor/ferromagnet interface converts spin-singlet Cooper pairs to a spin-polarized triplet state. Although the decay envelope of triplet pairs within ferromagnetic materials is well studied, little is known about their decay in nonmagnetic metals and superconductors and, in particular, in the presence of spin-orbit coupling (SOC). Here, we investigate devices in which singlet and triplet supercurrents propagate into the s-wave superconductor Nb. In the normal state of Nb, triplet supercurrents decay over a distance of 5 nm, which is an order of magnitude smaller than the decay of spin-singlet pairs due to the SOC. In the superconducting state of Nb, triplet supercurrents are not able to couple with the singlet wave function and are thus blocked by the absence of available equilibrium states in the singlet gap. The results offer insight into the dynamics between s-wave singlet and s-wave triplet states.
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Affiliation(s)
- Sachio Komori
- Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
| | - James M Devine-Stoneman
- Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
| | - Kohei Ohnishi
- Department of Physics, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
- Research Center for Quantum Nano-Spin Sciences, 744 Motooka, Fukuoka 819-0395, Japan
| | - Guang Yang
- Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
| | - Zhanna Devizorova
- Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russia
- Kotelnikov Institute of Radio-engineering and Electronics RAS, Moscow 125009, Russia
| | - Sergey Mironov
- Institute for Physics of Microstructures, Russian Academy of Sciences, GSP-105, Nizhny Novgorod 603950, Russia
| | - Xavier Montiel
- Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
| | - Linde A B Olde Olthof
- Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
| | - Lesley F Cohen
- The Blackett Laboratory, Imperial College London SW7 2AZ, UK
| | - Hidekazu Kurebayashi
- London Centre for Nanotechnology and Department of Electronic and Electrical Engineering at University College London, London WC1H 01H, UK
| | - Mark G Blamire
- Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
| | - Alexandre I Buzdin
- University Bordeaux, LOMA UMR-CNRS 5798,, F-33405 Talence Cedex, France
- Sechenov First Moscow State Medical University, Moscow 119991, Russia
| | - Jason W A Robinson
- Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
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Abstract
We present the development of the approach to thermodynamics based on measurement. First of all, we recall that considering classical thermodynamics as a theory of measurement of extensive variables one gets the description of thermodynamic states as Legendrian or Lagrangian manifolds representing the average of measurable quantities and extremal measures. Secondly, the variance of random vectors induces the Riemannian structures on the corresponding manifolds. Computing higher order central moments, one drives to the corresponding higher order structures, namely the cubic and the fourth order forms. The cubic form is responsible for the skewness of the extremal distribution. The condition for it to be zero gives us so-called symmetric processes. The positivity of the fourth order structure gives us an additional requirement to thermodynamic state.
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Affiliation(s)
- Valentin Lychagin
- V.A. Trapeznikov Institute of Control Sciences of Russian Academy of Sciences, 65 Profsoyuznaya Str., 117997 Moscow, Russia;
| | - Mikhail Roop
- V.A. Trapeznikov Institute of Control Sciences of Russian Academy of Sciences, 65 Profsoyuznaya Str., 117997 Moscow, Russia;
- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia
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7
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Hubmann S, Budkin G, Urban M, Bel’kov V, Dmitriev A, Ziegler J, Kozlov D, Mikhailov N, Dvoretsky S, Kvon Z, Weiss D, Ganichev S. Impact Ionization Induced by Terahertz Radiation in HgTe Quantum Wells of Critical Thickness. J Infrared Millim Terahertz Waves 2020; 41:1155-1169. [PMID: 34721704 PMCID: PMC8550783 DOI: 10.1007/s10762-020-00690-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 03/20/2020] [Indexed: 06/13/2023]
Abstract
We report on the observation of terahertz (THz) radiation induced band-to-band impact ionization in HgTe quantum well (QW) structures of critical thickness, which are characterized by a nearly linear energy dispersion. The THz electric field drives the carriers initializing electron-hole pair generation. The carrier multiplication is observed for photon energies less than the energy gap under the condition that the product of the radiation angular frequency ω and momentum relaxation time τ l larger than unity. In this case, the charge carriers acquire high energies solely because of collisions in the presence of a high-frequency electric field. The developed microscopic theory shows that the probability of the light-induced impact ionization is proportional to exp ( - E 0 2 / E 2 ) , with the radiation electric field amplitude E and the characteristic field parameter E 0. As observed in experiment, it exhibits a strong frequency dependence for ω τ ≫ 1 characterized by the characteristic field E 0 linearly increasing with the radiation frequency ω.
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Affiliation(s)
- S. Hubmann
- Terahertz Center, University of Regensburg, 93040 Regensburg, Germany
| | - G.V. Budkin
- Ioffe Institute, 194021 St. Petersburg, Russia
| | - M. Urban
- Terahertz Center, University of Regensburg, 93040 Regensburg, Germany
| | | | | | - J. Ziegler
- Terahertz Center, University of Regensburg, 93040 Regensburg, Germany
| | - D.A. Kozlov
- Rzhanov Institute of Semiconductor Physics, 630090 Novosibirsk, Russia
| | - N.N. Mikhailov
- Rzhanov Institute of Semiconductor Physics, 630090 Novosibirsk, Russia
| | - S.A. Dvoretsky
- Rzhanov Institute of Semiconductor Physics, 630090 Novosibirsk, Russia
| | - Z.D. Kvon
- Rzhanov Institute of Semiconductor Physics, 630090 Novosibirsk, Russia
| | - D. Weiss
- Terahertz Center, University of Regensburg, 93040 Regensburg, Germany
| | - S.D. Ganichev
- Terahertz Center, University of Regensburg, 93040 Regensburg, Germany
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