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REVIEW 4 major objections 5 minor 30 references

A superconducting nanowire meander can act as a surface-acoustic-wave transducer, decoupling acoustic and electromagnetic resonance frequencies.

Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →

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2026-08-01 00:10 UTC pith:BML5JY6U

load-bearing objection First nanowire SAW transducer demo, but the velocity-matching mechanism has a numbers problem. the 4 major comments →

arxiv 2607.26312 v1 pith:BML5JY6U submitted 2026-07-28 physics.app-ph cond-mat.mtrl-sci

Superconducting Nanowire Based Surface Acoustic Wave Transduction

Jack Guida , Kartikey Agarwal , Marco Colangelo , Siddhartha Ghosh This is my paper
classification physics.app-ph cond-mat.mtrl-sci
keywords superconducting nanowiresurface acoustic wavetransducerkinetic inductancedelay lineScAlNSiCcryogenic acoustics
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper claims that a single continuous superconducting niobium-nitride nanowire, bent into a meander, can launch and detect surface acoustic waves at cryogenic temperatures. The kinetic inductance of the superconductor slows the electromagnetic wave along the wire so that it co-propagates coherently with the acoustic wave, turning the whole meander into a distributed transducer. If correct, this decouples the acoustic operating frequency from the electromagnetic drive frequency—something conventional interdigitated transducers cannot do—and removes the lithographic limit on high-frequency operation. The claim is supported by coupled electromagnetic-piezoelectric simulations and by a 500-micrometer delay-line experiment on ScAlN-on-SiC at 0.9 K, where two time-domain packets are identified as Rayleigh and Sezawa modes.

Core claim

The central claim is that a meandered superconducting nanowire acts as a distributed surface-acoustic-wave transducer. Because the nanowire's kinetic inductance lowers the effective electromagnetic phase velocity to match the acoustic phase velocity, the electrical drive remains phase-matched to the acoustic wave along the entire length of the wire. The meander pitch sets the acoustic wavelength, while the aperture sets the electromagnetic resonance, so the two resonances are independently tunable. The paper reports experimental validation in a 500-micrometer delay line showing two time-domain signal packets at 85 ns and 125 ns, with group velocities of about 5900 and 4000 m/s, attributed to

What carries the argument

The meandered superconducting nanowire. The kinetic inductance of the NbN film (about 63 pH per square) substantially reduces the electromagnetic phase velocity along the propagation axis, allowing spatial and temporal phase matching with the surface acoustic wave. The aperture of the meander sets the electromagnetic resonance frequency (when one half of the effective electromagnetic wavelength spans the aperture), and the pitch sets the acoustic wavevector. Together these two independent geometric parameters realize a distributed, unidirectional IDT analog. Multiphysics simulation couples the electromagnetic field solution into piezoelectric and elastic physics via identity mapping, produci

Load-bearing premise

The claim hinges on the two time-domain packets at 85 ns and 125 ns being genuine Sezawa and Rayleigh surface acoustic waves that survive the time-gating, and not bulk acoustic waves or residual electromagnetic crosstalk.

What would settle it

Measure the delay-line response with the piezoelectric ScAlN layer removed (or with a non-piezoelectric substrate) and check whether the 85 ns and 125 ns packets persist; or vary the transducer separation D and verify the packet arrival times scale linearly with D at the claimed group velocities; or perform a spatially resolved scan of the surface displacement at those arrival times to confirm the Rayleigh and Sezawa mode profiles.

Watch this falsifier — get emailed when new claim-graph text bears on it.

If this is right

  • The acoustic and electromagnetic resonance frequencies are set by different geometric parameters, so the operating frequency is no longer limited by the smallest lithographic feature size.
  • The entire transducer is a single continuous superconducting trace patterned in one mask layer, simplifying fabrication on a planar heterostructure.
  • The demonstrated delay line operates at 0.9 K with broadband transduction from 0.5 to 20 GHz, pointing toward cryogenic RF signal-processing components compatible with superconducting circuits.
  • Multiple acoustic mode orders are accessible at harmonics of the electromagnetic resonance frequency (e.g., 2fEMo), as shown by simulation.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • A decisive test not performed in the paper would be to vary the delay-line distance D and confirm that the two packet arrival times scale linearly with D, or to image the out-of-plane surface displacement to verify the mode shapes.
  • Because the identification of the two packets rests on prior dispersion calculations and on time-gating that may not fully remove electromagnetic feedthrough, the strongest single piece of evidence is the pseudo-S21 transmission measurement that reproduces the S21 features without a full VNA calibration.
  • If the mechanism holds, the same nanowire could simultaneously act as a single-photon detector and an acoustic transducer, enabling photon-triggered modulation of phonon transmission and new readout schemes for detector arrays.
  • The paper's own admission that the fundamental mode near 9 GHz is not unambiguously identified suggests that the two-packet time-domain evidence, while consistent, would be strengthened by spatially resolved measurement.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

4 major / 5 minor

Summary. The paper reports a meandered NbN superconducting nanowire on ScAlN/SiC as a surface acoustic wave (SAW) transducer. The central claim is that the nanowire's kinetic inductance slows the electromagnetic phase velocity along the acoustic propagation axis so that a co-propagating electrical signal is velocity-matched to the SAW, producing a distributed, IDT-like transduction. The paper presents COMSOL multiphysics simulations using identity-mapped electromagnetic fields into piezoelectric/elastic physics, a fabricated 500 µm delay line, IV confirmation of superconductivity, S-parameter measurements with post-hoc calibration correction, time-domain analysis yielding two packets at 85 ns and 125 ns, and a pseudo-S21 measurement based on harmonic voting. The authors conclude that the time-domain packets correspond to Sezawa and Rayleigh modes, validating the nanowire transducer concept.

Significance. If the velocity-matched mechanism were convincingly demonstrated, this would be an interesting new transducer concept: a single continuous superconducting nanowire could act as a distributed SAW transducer with the meander pitch and aperture independently setting the acoustic and electromagnetic frequencies, potentially bypassing the lithographic frequency limit of conventional IDTs. The paper also contributes an early experimental exploration of superconducting-nanowire acoustics at cryogenic temperatures. The IV measurements confirm superconductivity, and the multiphysics framework is a useful attempt. However, the manuscript's validation is not yet convincing: the simulation and experimental parameters contain an unresolved frequency mismatch, the time-domain mode assignment rests on unmeasured velocities without controls, and the calibration/pseudo-S21 procedures are presented as heuristic. These issues bear directly on the central claim and must be resolved before the paper can be accepted.

major comments (4)
  1. [Sec. III (Multiphysics Modeling)] The simulation sets f_EM,o = 120 GHz and λ_A = 1.4 µm. With reported group velocities of 4000–5900 m/s, the corresponding acoustic resonance is roughly 2.9–4.2 GHz, not 120 GHz. The identity-mapping procedure takes the 120 GHz field distribution and applies it as an excitation in a piezoelectric frequency sweep over the acoustic frequency range, but it does not enforce f_EM = f_A. In a physical transducer the EM drive and the acoustic wave must be at the same temporal frequency; the field distribution at that single frequency is what determines the coupling. The simulation therefore appears to demonstrate that a static/mapped IDT-like pattern can excite a SAW, not that a 120 GHz resonant field distribution drives a 3 GHz acoustic wave. A coupled simulation at one common frequency—or a quantitative explanation of why the 120 GHz spatial pattern is unchanged at 3 GHz—is required to validat
  2. [Secs. IV and V] The aperture is fabricated with L = 640 µm based on ε_eff ≈ 550. This gives f_EM = c/(2L√ε_eff) ≈ 10 GHz, close to the 'fundamental mode expected near 9 GHz' mentioned in Sec. V. The first measured transmission peak, however, is near 3 GHz. For f = 3 GHz, the required effective permittivity would be (c/(2Lf))² ≈ 6100, an order of magnitude larger than the quoted value. The manuscript provides no direct measurement of the nanowire's electromagnetic phase velocity and no device with a different aperture to confirm that the aperture sets the operating frequency. Without this, the 3 GHz response cannot be attributed to the designed velocity-matched mode; it could arise from ordinary non-velocity-matched IDT-like coupling or from electrical feedthrough. This is a load-bearing inconsistency for the central transduction claim.
  3. [Sec. V and Fig. 6] The two time-domain packets are assigned to Sezawa and Rayleigh modes solely from their arrival times (5900 and 4000 m/s). No control experiment is reported—for example, a device on a non-piezoelectric substrate, a device with an acoustic absorber between the transducers, or a device with a different aperture. Such a control is necessary to exclude electrical crosstalk, bulk waves, and plate modes. Furthermore, the text states that the fundamental mode 'cannot be unambiguously identified without spatial imaging of its mode profile,' while the Conclusion states that both modes are 'unambiguously identified in time domain analysis.' These statements are internally inconsistent and the overclaim in the Conclusion should be corrected.
  4. [Appendices A and B] The VNA data are corrected post-hoc with a one-port three-term error model after calibration drift, and the corrected S21 is the basis for the resonance and time-domain analysis. The independent pseudo-S21 measurement in Appendix B is amplitude-only, uncalibrated, and depends on arbitrary algorithmic choices (prominence threshold 0.1, Gaussian width 0.4 GHz, harmonic vote counting). The claim of 'excellent agreement' is not quantified with a direct comparison to the VNA-measured S21. Neither measurement alone establishes the acoustic origin of the observed features; calibrated two-port measurements with proper error correction, plus a control experiment, are needed.
minor comments (5)
  1. [Fig. 5] The caption lists '(b)' twice, and the S11/S21 panel labels should be clarified, especially since the post-processing correction affects the displayed magnitudes.
  2. [Sec. V] The statement that subsequent peaks occur at 'approximately 3 GHz periodic intervals' is unusual for a periodic SAW transducer, which typically shows odd harmonics. Please clarify whether these are electromagnetic harmonics, acoustic harmonics, or something else.
  3. [Appendix B] The definitions of 'vote count' and 'weighted prominence' would be clearer with explicit equations rather than prose; the current description leaves room for ambiguity in the peak detection and voting algorithm.
  4. [Introduction] The full text contains garbled character sequences (e.g., '/uni00000024/...') in the Introduction; these should be cleaned before any resubmission.
  5. [General] No measurement uncertainty or device-to-device reproducibility is reported. Adding repeated measurements or error bars would strengthen the experimental claims.

Circularity Check

1 steps flagged

One self-citation supplies the mode labels; core transduction evidence remains measured and independently simulated.

specific steps
  1. self citation load bearing [Section V, Experimental Validation, time-domain analysis around Fig. 6]
    "Using the time-of-flight relation with a delay line length of 500 µm, this corresponds to group velocities of roughly 5900 and 4000 m/s, corresponding to Sezawa and fundamental Rayleigh modes, respectively [22]."

    The paper's headline claim is that the 85 ns and 125 ns packets are Sezawa and fundamental Rayleigh SAWs, 'constitut[ing] direct experimental evidence of acoustic wave transduction.' The only support for these specific mode labels is [22], a prior conference paper by the same two authors, whose dispersion calculation is not reproduced or independently benchmarked in this manuscript. The measured time-of-flight values are real, but the modal assignment by which the packets are identified rests on the authors' own prior calculation rather than on an external, parameter-free prediction. Thus the strong claim of 'unambiguous identification' partially reduces to a self-citation, while the more general claim of acoustic transduction retains independent experimental content.

full rationale

The core experimental chain is not circular: the two time-domain packets are located by direct time-of-flight measurements over a known 500 µm delay line, and the S-parameter features are measured. The COMSOL simulation is a forward multiphysics model that computes the electromagnetic field of the nanowire geometry and then applies it to the piezoelectric equations; it is not fitted to the observed time-domain packets, so the simulated admittance resonance and anti-resonance provide independent content. The aperture design uses an effective permittivity extracted from Sonnet simulations, but the paper does not exhibit an explicit calculation showing that the observed 3 GHz features follow from that fitted ε_eff, so I do not treat that design step as a fitted input renamed as a prediction. The one load-bearing circularity is the mode assignment: the expected Sezawa and Rayleigh velocities come from the authors' own prior work [22], which supplies the labels for the measured packets. Because the time-of-flight velocities themselves are measured, the circularity is partial and does not invalidate the central transduction evidence, but it weakens the 'unambiguous identification' of the modes. The apparent inconsistency between L=640 µm, ε_eff≈550, and a ~3 GHz first resonance is a correctness/consistency concern outside the circularity analysis.

Axiom & Free-Parameter Ledger

2 free parameters · 4 axioms · 0 invented entities

No new physical entities are introduced. The central claim relies on material parameters from prior work, a sequential simulation approximation, and a linear-response assumption in the measurement analysis.

free parameters (2)
  • Effective permittivity ε_eff = ≈550 from Sonnet RF simulations, used to set aperture length 640 µm
    This parameter determines the electromagnetic wavelength and hence the aperture, directly shaping the transducer design. It is not independently measured.
  • Pseudo-S21 peak detection thresholds = prominence threshold 0.1, Gaussian width σ=0.4 GHz
    These heuristic choices determine which peaks are considered true resonances in the harmonic-voting analysis, affecting the claim of broadband transduction.
axioms (4)
  • domain assumption Material properties of 30% ScAlN on SiC (piezoelectric coefficients, acoustic velocities, dispersion) from prior literature and the authors' own publications [22,24].
    The identification of the observed group velocities with specific modes relies on these values.
  • domain assumption Identity-mapping of the electromagnetic displacement field onto the piezoelectric domain is a valid approximation for the actual electromechanical coupling.
    The COMSOL simulation does not solve a fully coupled EM-piezoelectric system; it sequentially maps the EM solution to the mechanical domain, assuming negligible back-reaction.
  • domain assumption The acoustic transducer responds linearly, so harmonic tones probe the device identically to direct excitation at those frequencies.
    The pseudo-S21 harmonic-voting method rests on this linearity and superposition principle.
  • domain assumption Time-domain gating fully removes electromagnetic feedthrough, leaving only acoustic packets.
    The time-of-flight identification assumes that residual crosstalk does not appear in the 85-125 ns window.

pith-pipeline@v1.3.0-alltime-deepseek · 218 in / 8871 out tokens · 118834 ms · 2026-08-01T00:10:31.958489+00:00 · methodology

0 comments
read the original abstract

This work presents the demonstration of a superconducting niobium nitride (NbN) nanowire surface acoustic wave transducer, enabling a cryogenic acoustic delay line in scandium aluminum nitride (ScAlN) on silicon carbide (SiC). The superconducting nanowire slows the effective electromagnetic phase velocity along the acoustic wave propagation axis to match that of the surface acoustic wave, such that the co-propagating electrical signal continuously and coherently drives the acoustic wave along the length of the wire. The operating principle is validated through coupled full-wave electromagnetic and piezoelectric finite element method simulations and then experimentally confirmed through demonstration of a 500 {\mu}m delay line exhibiting a 125 ns time delay, with broadband transduction characterized across 0.5-20 GHz at 0.9 K, establishing superconducting nanowires as an emerging class of acoustic transducers with direct implications for cryogenic signal processing and integration with superconducting quantum circuits.

Figures

Figures reproduced from arXiv: 2607.26312 by Jack Guida, Kartikey Agarwal, Marco Colangelo, Siddhartha Ghosh.

Figure 1
Figure 1. Figure 1: FIG. 1. Illustration of the meandered nanowire transducer operating modes. The spatially periodic nanowire voltage distribu [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. The [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. (a) Scanning electron microscope (SEM) image of [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Time-domain [PITH_FULL_IMAGE:figures/full_fig_p006_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Normalized pseudo- [PITH_FULL_IMAGE:figures/full_fig_p008_7.png] view at source ↗

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Reference graph

Works this paper leans on

30 extracted references · 2 canonical work pages

  1. [1]

    Delsing, A

    P. Delsing, A. N. Cleland, M. J. A. Schuetz, J. Kn¨ orzer, G. Giedke, J. I. Cirac, K. Srinivasan, M. Wu, K. C. Bal- ram, C. B¨ auerle, T. Meunier, C. J. B. Ford, P. V. San- tos, E. Cerda-M´ endez, H. Wang, H. J. Krenner, E. D. S. Nysten, M. Weiß, G. R. Nash, L. Thevenard, C. Gour- don, P. Rovillain, M. Marangolo, J.-Y. Duquesne, G. Fis- cherauer, W. Ruile...

    2019

  2. [2]

    Korzh, Q.-Y

    B. Korzh, Q.-Y. Zhao, J. P. Allmaras, S. Frasca, T. M. Autry, E. A. Bersin, A. D. Beyer, R. M. Briggs, B. Bum- ble, M. Colangelo, G. M. Crouch, A. E. Dane, T. Gerrits, A. E. Lita, F. Marsili, G. Moody, C. Pe˜ na, E. Ramirez, J. D. Rezac, N. Sinclair, M. J. Stevens, A. E. Velasco, V. B. Verma, E. E. Wollman, S. Xie, D. Zhu, P. D. Hale, M. Spiropulu, K. L. ...

    2020

  3. [3]

    Hackett, M

    L. Hackett, M. Miller, F. Brimigion, D. Dominguez, G. Peake, A. Tauke-Pedretti, S. Arterburn, T. A. Friedmann, and M. Eichenfield, Towards single-chip ra- diofrequency signal processing via acoustoelectric elec- tron–phonon interactions, Nature Communications12, 2769 (2021)

    2021

  4. [4]

    Takaki Murata, Michio Kadota, Takeshi Nakao, and Kenji Matsuda, Surface acoustic wave filter in high fre- quency with narrow bandwidth and excellent tempera- ture characteristic, in2008 IEEE MTT-S International Microwave Symposium Digest(IEEE, Atlanta, GA, USA,

  5. [5]

    Soluch, Design of SA W delay lines for sensors, Sensors and Actuators A: Physical67, 60 (1998)

    W. Soluch, Design of SA W delay lines for sensors, Sensors and Actuators A: Physical67, 60 (1998)

    1998

  6. [6]

    Bl´ esin, W

    T. Bl´ esin, W. Kao, A. Siddharth, R. N. Wang, A. Attana- sio, H. Tian, S. A. Bhave, and T. J. Kippenberg, Bidirec- tional microwave-optical transduction based on integra- tion of high-overtone bulk acoustic resonators and pho- tonic circuits, Nature Communications15, 6096 (2024)

    2024

  7. [7]

    Schuetz, E

    M. Schuetz, E. Kessler, G. Giedke, L. Vandersypen, M. Lukin, and J. Cirac, Universal Quantum Transduc- ers Based on Surface Acoustic Waves, Physical Review X5, 031031 (2015)

    2015

  8. [8]

    Kramer, J

    J. Kramer, J. Campbell, T.-H. Hsu, I. Anderson, and R. Lu, Cryogenic Q enhancement in 50 GHz piezoelectric resonators, Applied Physics Letters128, 102205 (2026)

    2026

  9. [9]

    Guida and S

    J. Guida and S. Ghosh, Design and Analysis of Guided Surface Acoustic Waves in ScAlN on Sapphire for Phononic Integrated Circuits, IEEE Transactions on Ul- trasonics, Ferroelectrics, and Frequency Control72, 44 (2025)

    2025

  10. [10]

    Piazza, V

    G. Piazza, V. Felmetsger, P. Muralt, R. H. Olsson III, and R. Ruby, Piezoelectric aluminum nitride thin films for microelectromechanical systems, MRS Bulletin37, 1051 (2012)

    2012

  11. [11]

    R. M. R. Pinto, V. Gund, R. A. Dias, K. K. Nagaraja, and K. B. Vinayakumar, CMOS-Integrated Aluminum Nitride MEMS: A Review, Journal of Microelectrome- chanical Systems31, 500 (2022)

    2022

  12. [12]

    Guida and S

    J. Guida and S. Ghosh, Phononic Integrated Circuit Component Design and Analysis for Surface Acoustic Waves in ScAlN on Silicon Carbide, Journal of Micro- electromechanical Systems34, 368 (2025)

    2025

  13. [13]

    Hashimoto,Surface acoustic wave devices in telecommunications: modelling and simulation(Springer, Berlin, 2000)

    K.-y. Hashimoto,Surface acoustic wave devices in telecommunications: modelling and simulation(Springer, Berlin, 2000)

    2000

  14. [14]

    S. Guo, Q. Chen, D. Pan, Y. Wu, X. Tu, G. He, H. Han, F. Li, X. Jia, Q. Zhao, H. Zhang, X. Bei, J. Xie, L. Zhang, J. Chen, L. Kang, and P. Wu, Fabrication of supercon- ducting niobium nitride nanowire with high aspect ratio for X-ray photon detection, Scientific Reports10, 9057 (2020)

    2020

  15. [15]

    McCaughan, R

    A. McCaughan, R. DeCrescent, and K. Silverman, Traveling-wave surface acoustic wave transducer and in- terconverting an electrical signal and a surface acous- tic waves, U.S. Patent Application US20250015780A1 (2025), filed: Jan. 9, 2025

    2025

  16. [16]

    Kreidel, X

    M. Kreidel, X. Chu, J. Balgley, A. Antony, N. Verma, J. Ingham, L. Ranzani, R. Queiroz, R. M. Westervelt, J. Hone, and K. C. Fong, Measuring kinetic inductance and superfluid stiffness of two-dimensional supercon- 10 ductors using high-quality transmission-line resonators, Physical Review Research6, 043245 (2024)

    2024

  17. [17]

    D. F. Santavicca, J. K. Adams, L. E. Grant, A. N. McCaughan, and K. K. Berggren, Microwave dynam- ics of high aspect ratio superconducting nanowires stud- ied using self-resonance, Journal of Applied Physics119, 234302 (2016)

    2016

  18. [18]

    Da Cunha and E

    M. Da Cunha and E. Adler, A network model for arbi- trarily oriented IDT structures, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control40, 622 (1993)

    1993

  19. [19]

    Tabrizian, M

    R. Tabrizian, M. Rais-Zadeh, and F. Ayazi, Effect of phonon interactions on limiting the f.Q product of mi- cromechanical resonators, inTRANSDUCERS 2009 - 2009 International Solid-State Sensors, Actuators and Microsystems Conference(IEEE, Denver, CO, USA,

    2009

  20. [20]

    F. P. Venza and M. Colangelo, Research trends in single- photon detectors based on superconducting wires, APL Photonics10, 10.1063/5.0246490 (2025)

    work page doi:10.1063/5.0246490 2025

  21. [21]

    M. A. Caro, S. Zhang, T. Riekkinen, M. Ylilammi, M. A. Moram, O. Lopez-Acevedo, J. Molarius, and T. Laurila, Piezoelectric coefficients and spontaneous polarization of ScAlN, Journal of Physics: Condensed Matter27, 245901 (2015)

    2015

  22. [22]

    Guida and S

    J. Guida and S. Ghosh, Focused Guided Surface Acoustic Waves in 30% Scandium Aluminum Nitride on Silicon Carbide, in2024 IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS)(IEEE, Taipei, Taiwan, 2024) pp. 1–4

    2024

  23. [23]

    S. Cho, Y. Wang, J. Kramer, K. Nguyen, and R. Lu, Acoustic Delay Lines in Thin-Film Lithium Niobate on Silicon Carbide, in2022 IEEE/MTT-S International Mi- crowave Symposium - IMS 2022(IEEE, Denver, CO, USA, 2022) pp. 809–812

    2022

  24. [24]

    Guida and S

    J. Guida and S. Ghosh, Guided Sezawa Mode Phononic Racetrack Resonators in Scandium Aluminum Nitride on Silicon Carbide, in2025 IEEE International Ultrasonics Symposium (IUS)(IEEE, Utrecht, Netherlands, 2025) pp. 1–4

    2025

  25. [25]

    Colombo, A

    L. Colombo, A. Kochhar, G. Vidal-Alvarez, P. Simeoni, U. Soysal, and G. Piazza, Sub-GHz X-Cut Lithium Nio- bateS0Mode MEMS Resonators, Journal of Microelec- tromechanical Systems31, 888 (2022)

    2022

  26. [26]

    Klopfenstein, A Transmission Line Taper of Improved Design, Proceedings of the IRE44, 31 (1956)

    R. Klopfenstein, A Transmission Line Taper of Improved Design, Proceedings of the IRE44, 31 (1956)

    1956

  27. [27]

    Q.-Y. Zhao, D. Zhu, N. Calandri, A. E. Dane, A. N. McCaughan, F. Bellei, H.-Z. Wang, D. F. Santavicca, and K. K. Berggren, Single-photon imager based on a superconducting nanowire delay line, Nature Photonics 11, 247 (2017)

    2017

  28. [28]

    D. Zhu, M. Colangelo, B. A. Korzh, Q.-Y. Zhao, S. Frasca, A. E. Dane, A. E. Velasco, A. D. Beyer, J. P. Allmaras, E. Ramirez, W. J. Strickland, D. F. Santavicca, M. D. Shaw, and K. K. Berggren, Supercon- ducting nanowire single-photon detector with integrated impedance-matching taper, Applied Physics Letters114, 10.1063/1.5080721 (2019)

    work page doi:10.1063/1.5080721 2019

  29. [29]

    Y. Chu, P. Kharel, W. H. Renninger, L. D. Burkhart, L. Frunzio, P. T. Rakich, and R. J. Schoelkopf, Quantum acoustics with superconducting qubits, Science358, 199 (2017)

    2017

  30. [30]

    D. K. Rytting, Network analyzer error models and cali- bration methods, 62nd ARFTG Conference Short Course Notes (2003), Boulder, CO. Available:http://emlab. uiuc.edu/ece451/appnotes/Rytting_NAModels.pdf

    2003