Echeistov Vladimir Vladimirovich

@bmstu.ru

Echeistov Vladimir Vladimirovich


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https://researchid.co/vvecheistov
17

Scopus Publications

Scopus Publications

  • High-Efficiency Fiber Edge Coupling for Silicon Nitride Integrated Photonics
    Sergey S. Avdeev, Aleksandr S. Baburin, Evgeniy V. Sergeev, Alexei B. Kramarenko, Arseniy V. Belyaev, et al.
    Micromachines, 2025
    Photonic integrated circuits play a crucial role in almost every aspect of modern life, such as data storage, telecommunications, medical diagnostics, green energy, autonomous driving, agriculture, and high-performance computing. To fully harness their benefits, an efficient coupling mechanism is required to successfully launch light into on-chip waveguides from fibers. This study introduces low-loss coupling strategies and their implementation for silicon nitride integrated photonics. Here we present an overview of coupling technologies, optimized designs, and a fabrication technique for inverse tapers, which enable effective coupling for both transverse-magnetic and transverse-electric modes. We measured the coupling losses of 0.15 dB for UHNA-7 fiber at 1550 nm per facet for single-mode 220 × 1200 nm waveguides. We also designed, fabricated, and experimentally characterized a multi-tip taper, yielding 1.5 dB per facet at 1550 nm with broadband stability over 1500–1600 nm. We believe that our approach is universal and can be used both for individual fiber and fiber arrays coupling and for subsequent assembly of fiber with a chip, ensuring minimal losses.
  • An engineering guide to superconducting quantum circuit shielding
    Elizaveta I. Malevannaya, Viktor I. Polozov, Anton I. Ivanov, Aleksei R. Matanin, Nikita S. Smirnov, et al.
    Applied Physics Reviews, 2025
    In this review, we provide a practical guide to superconducting quantum circuits protection from broadband electromagnetic and infrared radiation using cryogenic shielding and microwave line filtering. Recently, superconducting multi-qubit processors demonstrated quantum supremacy and quantum error correction below the surface code threshold. However, the decoherence-induced loss of quantum information still remains a challenge for 100+ qubit quantum computing. Here, we review the key aspects of superconducting quantum circuits shielding from stray electromagnetic fields and infrared radiation—multilayer shielding design, materials, fridge line filtration, cryogenic setup configurations, and shielding efficiency evaluation methods developed over the last 10 years. In summary, we provide recommendations for the design of an efficient and compact shielding system, as well as microwave filtering for large-scale superconducting quantum systems.
  • High cooling capacity 3He ± 4He dilution refrigerator
    Aleksey M. Tikhonov, Roman B. Gusev, Sergey T. Boldarev, Il'ya A. Rodionov, Denis A. Fokin, et al.
    Physics Uspekhi, 2025
  • Subangstrom ion beam engineering of buried ultrathin oxides for scalable quantum computing
    Nikita S. Smirnov, Elizaveta A. Krivko, Daria A. Moskaleva, Dmitry O. Moskalev, Anastasia A. Solovieva, et al.
    Science Advances, 2025
    Multilayer nanoscale systems incorporating ultrathin tunnel barriers, magnetic materials, amorphous oxides, and promising dielectrics are essential for next-generation logics, memory, quantum, and neuro-inspired computing. Still, an ultrathin film control at the atomic scale remains challenging. Here, we introduce a complementary metal-oxide semiconductor–compatible approach using focused ion beam irradiation for buried ultrathin films’ engineering with subangstrom thickness control. Molecular dynamics simulations confirm the pivotal role of ion-induced crystal defects. Its performance is exemplified by Josephson junction resistance tuning in the range of 2 to 37% with a 0.86% standard deviation in completed chips. Furthermore, it enables ±17-megahertz frequency accuracy (±0.172 angstrom tunnel barrier thickness variation) in superconducting multiqubit processors, as well as qubit energy relaxation and echo coherence times exceeding 0.5 milliseconds.
  • Lumped-element SNAIL parametric amplifier with two-pole matching network
    D. Moskaleva, N. Smirnov, D. Moskalev, A. Ivanov, A. Matanin, et al.
    Applied Physics Letters, 2024
    Broadband impedance-matched Josephson parametric amplifiers are key components for high-fidelity single-shot multi-qubit readout. Nowadays, several types of impedance matched parametric amplifiers have been proposed: the first is an impedance-matched parametric amplifier based on a Klopfenstein taper, and the second is the impedance-matched parametric amplifier based on auxiliary resonators. Here, we present the quantum-limited 3-wave-mixing lumped-element SNAIL parametric amplifier with two-pole impedance matching transformer. A two-pole Chebyshev matching network with shunted resonators is based on parallel-plate capacitors and superconducting planar coil. Operating in a flux-pumped mode, we experimentally demonstrate an average gain of 15 dB across a 600 MHz bandwidth, along with an average saturation power of −107 dBm and quantum-limited noise temperature.
  • Sputtered NbN films for ultrahigh performance superconducting nanowire single-photon detectors
    Ilya A. Stepanov, Aleksandr S. Baburin, Danil V. Kushnev, Evgeniy V. Sergeev, Oksana I. Shmonina, et al.
    APL Materials, 2024
    At the present time, ultrahigh performance superconducting nanowire single-photon detectors are the key elements in a variety of devices from biological research to quantum communications and computing. Accurate tuning of superconducting material properties is a powerful resource for fabricating single-photon detectors with desired properties. Here, we report on the major theoretical relations between ultrathin niobium nitride (NbN) film properties and superconducting nanowire single-photon detector characteristics, as well as the dependence of ultrathin NbN film properties on reactive magnetron sputtering recipes. Based on this study, we formulate the exact requirements for ultrathin NbN films for ultrahigh performance superconducting nanowire single-photon detectors. Then, we experimentally studied the properties of ultrathin NbN films (morphology, crystalline structure, critical temperature, and sheet resistance) on silicon, sapphire, silicon dioxide, and silicon nitride substrates sputtered with various recipes. We demonstrate ultrathin NbN films (obtained with more than 100 films deposition) with a wide range of critical temperature from 2.5 to 12.1 K and sheet resistance from 285 to 2000 Ω/sq and report a sheet resistance evolution of more than 40% within two years. Finally, we found out that one should use ultrathin NbN films with a specific critical temperature near 9.5 K and a sheet resistance of about 350 Ω/sq for ultrahigh performance state-of-the-art superconducting nanowire single-photon detectors at 1550 nm wavelength.
  • High-Q trenched aluminum coplanar resonators with an ultrasonic edge microcutting for superconducting quantum devices
    E. V. Zikiy, A. I. Ivanov, N. S. Smirnov, D. O. Moskalev, V. I. Polozov, et al.
    Scientific Reports, 2023
    Dielectric losses are one of the key factors limiting the coherence of superconducting qubits. The impact of materials and fabrication steps on dielectric losses can be evaluated using coplanar waveguide (CPW) microwave resonators. Here, we report on superconducting CPW microwave resonators with internal quality factors systematically exceeding 5 × 106 at high powers and 2 × 106 (with the best value of 4.4 × 106) at low power. Such performance is demonstrated for 100-nm-thick aluminum resonators with 7–10.5 um center trace on high-resistivity silicon substrates commonly used in Josephson-junction based quantum circuit. We investigate internal quality factors of the resonators with both dry and wet aluminum etching, as well as deep and isotropic reactive ion etching of silicon substrate. Josephson junction compatible CPW resonators fabrication process with both airbridges and silicon substrate etching is proposed. Finally, we demonstrate the effect of airbridges’ positions and extra process steps on the overall dielectric losses. The best quality factors are obtained for the wet etched aluminum resonators and isotropically removed substrate with the proposed ultrasonic metal edge microcutting.
  • Robust cryogenic matched low-pass coaxial filters for quantum computing applications
    Anton I. Ivanov, Victor I. Polozov, Vladimir V. Echeistov, Andrey A. Samoylov, Elizaveta I. Malevannaya, et al.
    Applied Physics Letters, 2023
    Electromagnetic noise is one of the main external factors decreasing superconducting qubit coherence. Matched coaxial filters can prevent microwave and IR photons' negative influence on superconducting quantum circuits. In this report, we describe the design and fabrication process of matched coaxial filters for noise-sensitive measurements at millikelvin temperatures. A robust transmission coefficient and ultralow reflection loss of −20 dB in the frequency range up to 20 GHz is achieved. Fabricated low-pass filters have linear transmission and reflection characteristics with 3 dB-cutoff frequency of 1.5–2.5 GHz. A method for extracting the propagation constant and filter impedance from scattering parameter measurements is demonstrated. This method is experimentally approved on a filter with a compound of Cu powder and Stycast epoxy resin and a filter filled with ECCOSORB CR-110 epoxy resin. The proposed design and assembly technology are versatile for various compounds and provide highly repeatable geometric and microwave characteristics. Furthermore, we demonstrate that these low-pass coaxial filters can be effectively utilized to improve superconducting qubit relaxation due to suppressing standing waves originating from reflections in control coaxial cables.
  • Integrated membrane-free thermal flow sensor for silicon-on-glass microfluidics
    Vitaly V. Ryzhkov, Vladimir V. Echeistov, Aleksandr V. Zverev, Dmitry A. Baklykov, Tatyana Konstantinova, et al.
    Lab on A Chip, 2023
    Design, electronics, fabrication technology, and characterization method of an on-chip corrosion-resistant microfluidic thermal flow sensor for silicon lab-on-a-chip and POC devices.
  • Broadband SNAIL parametric amplifier with microstrip impedance transformer
    D. Ezenkova, D. Moskalev, N. Smirnov, A. Ivanov, A. Matanin, et al.
    Applied Physics Letters, 2022
    Josephson parametric amplifiers are an important part of a modern superconducting quantum computing platform and squeezed quantum states generation devices. Traveling wave and impedance-matched parametric amplifiers provide broad bandwidth for high-fidelity single-shot readout of multiple qubit superconducting circuits. Here, we present a quantum-limited 3-wave-mixing parametric amplifier based on superconducting nonlinear asymmetric inductive elements (SNAILs), whose useful bandwidth is enhanced with an on-chip two-section impedance-matching circuit based on microstrip transmission lines. The amplifier dynamic range is increased using an array of 67 SNAILs with 268 Josephson junctions, forming a nonlinear quarter-wave resonator. Operating in a current-pumped mode, we experimentally demonstrate an average gain of 17 dB across 300 MHz bandwidth, along with an average saturation power of –100 dBm, which can go as high as −97 dBm with quantum-limited noise performance. Moreover, the amplifier can be fabricated using a simple technology with just one e-beam lithography step.
  • Cyclic on-chip bacteria separation and preconcentration
    Vitaly V. Ryzhkov, Alexander V. Zverev, Vladimir V. Echeistov, Mikhail Andronic, Ilya A. Ryzhikov, et al.
    Scientific Reports, 2020
  • Machine Learning for Optical Gas Sensing: A Leaky-Mode Humidity Sensor as Example
    Vladimir V. Kornienko, Igor A. Nechepurenko, Peter N. Tananaev, Eugeny D. Chubchev, Aleksandr S. Baburin, et al.
    IEEE Sensors Journal, 2020
  • Integrated microfluidic flow sensor for LAB-oN-CHIP and PoINT-oF-CARE applications
    A.V. Zverev, M. Andronik, V.V. Echeistov, Z.H. Issabayeva, O.S. Sorokina, et al.
    Biotekhnologiya, 2020
  • SERS-Active substrates nanoengineering based on e-beam evaporated self-assembled silver films
    Irina Boginskaya, Marina Sedova, Aleksandr Baburin, Konstantin Afanas’ev, Alexander Zverev, et al.
    Applied Sciences Switzerland, 2019
  • An information system of predictive maintenance analytical support of industrial equipment
    Andrey Vlasov, Vladimir Echeistov, Aleksey Krivoshein, Vadim Shakhnov, Sergey Filin, et al.
    Journal of Applied Engineering Science, 2018
  • Optimization of the matrices structural parameters for the synthesis of restricted access media (RAM) adsorbents for chromatography
    S Yu Bogoslovskii, V V Echeistov, V S Boldyrev
    Journal of Physics Conference Series, 2017
  • Optofluidic lab-on-chip platform for realtime sensing applications
    Aleksandr V. Zverev, Anton I. Ivanov, Anastasiya A. Pishimova, Mikhail Andronik, Vladimir V. Echeistov, et al.
    Progress in Electromagnetics Research Symposium, 2017