Article
Engineering, Electrical & Electronic
A. L. Graninger, J. M. Cochran, A. A. Pesetski, J. D. Strand, R. E. Zimmerman, N. L. Mungo, C. H. Smith, M. Lilly
Summary: This article reports on the design, fabrication, and measurement of a low-temperature microwave switch architecture that can be fully integrated on chip using single Josephson junctions and superconducting bias lines. A reflective single-pole-single-throw switch is realized by tuning the critical current of a single Josephson junction by way of a local flux bias. The performance of the switches, which require no intrinsic power dissipation, was verified for input powers of -100 to -60 dBm.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Akim A. Babenko, Nathan E. Flowers-Jacobs, Gregor Lasser, Justus A. Brevik, Anna E. Fox, Paul D. Dresselhaus, Zoya Popovic, Samuel P. Benz
Summary: This article presents the design and characterization of a broadband RF Josephson arbitrary waveform synthesizer, which uses integrated low-pass/high-pass superconducting diplexers to achieve broadband filtering of the feedthrough signal components in the drive-current pulses. The performance of the synthesizer is evaluated and quantified.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Physics, Applied
I. I. Soloviev, V. I. Ruzhickiy, S. Bakurskiy, N. Klenov, M. Yu. Kupriyanov, A. A. Golubov, O. Skryabina, V. S. Stolyarov
Summary: While magnetic flux quantization in superconductors poses limitations on functional density, the innovative design utilizing bistable Josephson junctions allows for the development of superconducting digital circuits without relying on magnetic flux and inductors, thus promising higher space efficiency.
PHYSICAL REVIEW APPLIED
(2021)
Article
Engineering, Electrical & Electronic
Eldad Holdengreber, Aviv Glezer Moshe, Dhasarathan Vigneswaran, Shmuel E. Schacham, Eliyahu Farber
Summary: Research focused on the temperature dependence of frequency selectivity in high temperature superconducting Josephson Junction detectors, with simulations and experiments showing a strong correlation between detector parameters and measurements; the error in radiation frequency measured at 60-70 K was 3.5-7%, 3-4 orders of magnitude higher than that at 40-50 K, highlighting the significant influence of temperature on frequency selectivity.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Materials Science, Multidisciplinary
Claudio Guarcello, Luca Chirolli, Maria Teresa Mercaldo, Francesco Giazotto, Mario Cuoco
Summary: This study demonstrates that a dynamical regime with oscillating phase evolution is a universal characteristic of driven Josephson systems with sign competition in the Josephson couplings, and can be initiated by changing the parameters that set the phase state.
Article
Physics, Applied
David I. Olaya, John Biesecker, Manuel A. Castellanos-Beltran, Adam J. Sirois, Peter F. Hopkins, Paul D. Dresselhaus, Samuel P. Benz
Summary: We presented electrical characterization data of sputtered Nb/a-Si/Nb Josephson junctions for high-speed and high-density superconducting circuits. The critical current density showed an exponential dependence on barrier thickness, and the junction properties remained unchanged after annealing at temperatures up to 300°C. These results indicate that Nb/a-Si/Nb Josephson junctions are a potential candidate for higher speed and higher density superconducting circuits.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Mariia S. Shevchenko, Artemiy A. Atepalikhin, Fedor Khan, Lyudmila Filippenko, Artem M. Chekushkin, Valery P. Koshelets
Summary: This study fabricated and studied Josephson junctions with non-hysteretic I-V characteristic and high critical parameters, and applied them to develop tunable THz range oscillators. By using a new type of shunting, the circuit parameters were improved and the niobium integrated circuits for superconducting oscillators and SIS junctions were designed. The experimental results showed efficient operation of these circuits in the frequency range of 300 to 700 GHz.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Chemistry, Multidisciplinary
Tobias W. Schmitt, Malcolm R. Connolly, Michael Schleenvoigt, Chenlu Liu, Oscar Kennedy, Jose M. Chavez-Garcia, Abdur R. Jalil, Benjamin Bennemann, Stefan Trellenkamp, Florian Lentz, Elmar Neumann, Tobias Lindstroem, Sebastian E. de Graaf, Erwin Berenschot, Niels Tas, Gregor Mussler, Karl D. Petersson, Detlev Gruetzmacher, Peter Schueffelgen
Summary: This study demonstrates the implementation of superconducting transmon qubits using topological insulator Josephson junctions. The results show the compatibility of these qubits with strong-coupling circuit quantum electrodynamics and their ability for qubit control and temporal quantum coherence.
Article
Materials Science, Multidisciplinary
Jaglul Hasan, Konstantin N. Nesterov, Songci Li, Manuel Houzet, Julia S. Meyer, Alex Levchenko
Summary: In this study, we investigate the anomalous response of a Josephson junction in two-dimensional electron systems with broken inversion and time-reversal symmetries. By utilizing both the Ginzburg-Landau formalism and the microscopic Green's functions approach, we analyze this phenomenon and calculate the magnitude of the critical current as well as the phase shifts in different cases.
Article
Chemistry, Multidisciplinary
Francesco Borsoi, Grzegorz P. Mazur, Nick van Loo, Leo Bourdet, Kongyi Li, Svetlana Korneychuk, Alexandra Fursina, Ji-Yin Wang, Vukan Levajac, Elvedin Memisevic, Ghada Badawy, Sasa Gazibegovic, Kevin van Hoogdalem, Erik P. A. M. Bakkers, Leo P. Kouwenhoven, Sebastian Heedt, Marina Quintero-Perez, Michal P. Nowak
Summary: This study introduces a novel fabrication concept based on shadow walls, enabling in situ, selective, and consecutive depositions of superconductors and normal metals to form defect-free semiconducting-superconducting interfaces. The method allows for the realization of devices in a single shot, eliminating fabrication steps after the synthesis of the fragile semiconductor/superconductor interface. The cleanliness of the technique enables systematic studies of topological superconductivity in nanowires and the synthesis of advanced nano-devices based on a wide range of material combinations and geometries while maintaining high interface quality.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Anastasiya A. Pishchimova, Nikita S. Smirnov, Daria A. Ezenkova, Elizaveta A. Krivko, Evgeniy V. Zikiy, Dmitry O. Moskalev, Anton I. Ivanov, Nikita D. Korshakov, Ilya A. Rodionov
Summary: Josephson superconducting qubits and parametric amplifiers have made significant progress in recent years. As these devices become more complex, the reproducibility of their electrical properties across a chip becomes increasingly important. This study focuses on minimizing the variation of the critical current in Josephson junctions, which is the essential electrical parameter in a chip. By optimizing the fabrication process, the resistance variation across different chip areas is reduced, ensuring high reproducibility.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Michael Barth, Jacob Fuchs, Denis Kochan
Summary: This study investigates the interplay between spectral and transport properties in bilayer graphene and s-wave superconductors using Green's function analytical methods and numerical simulations. The results reveal unique superconducting signatures that differentiate between resonant and off-resonant regimes, providing important insights into the behavior of bilayer graphene and other functionalized superconductors.
Article
Chemistry, Multidisciplinary
Mikhail Tarasov, Andrey Lomov, Artem Chekushkin, Mikhail Fominsky, Denis Zakharov, Andrey Tatarintsev, Sergey Kraevsky, Anton Shadrin
Summary: This paper develops fabrication technology and studies aluminum films for superconducting quantum nanoelectronics using AFM, SEM, XRD, HRXRR. Two-temperature-step quasiepitaxial growth of Al on (111) Si substrate provides a preferentially (111)-oriented Al polycrystalline film and improves film quality by reducing structural defects and surface imperfections. This technique has the potential to enhance superconducting current density, stray capacitance, relaxation time, and reduce noise.
Article
Optics
Ye Luo, Chunlei Sun, Hui Ma, Maoliang Wei, Junying Li, Jialing Jian, Chuyu Zhong, Zequn Chen, Renjie Tang, Kathleen A. Richardson, Hongtao Lin, Lan Li
Summary: Flexible integrated photonics is a rapidly emerging technology with wide-ranging applications. This study demonstrates the design and fabrication of essential flexible passive devices for integrated photonic circuits, achieving superior performance.
Article
Engineering, Electrical & Electronic
Mei Yu, Peng Ping, Ruijing Zhao, Changqing Song, Kai Zheng, Zhenguo Wang, Weiwei Xu
Summary: In this paper, a meander embedding sector antenna operated in a traveling-wave mode for series Josephson junctions (JJs) is proposed. The experiment shows that up to seven JJs in series have been successfully inserted into the antenna, and the antenna still maintains good performance. Furthermore, up to 48% of the 10-dB relative bandwidth of this antenna is achieved, which has a great advantage for wideband superconducting series JJ devices.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Kateryna Smirnova, Christian Bohn, Mehmet Kaynak, Ahmet Cagri Ulusoy
Summary: This letter introduces a power consumption reduction aspect for a 100-GHz low-noise amplifier (LNA). Two designs implemented in 0.13-μm SiGe BiCMOS technology demonstrate state-of-the-art performance, with P-DC reduced from 23.5 mW to 3.8 mW for the low-power version. Both circuits exhibit a measured gain of 22 and 16 dB, and a noise figure of 4 and 6.3 dB at 100 GHz. The occupied IC area is 0.018 and 0.014 mm² in both cases, making it the most compact design in the frequency range of interest.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Christian Bohn, Mehmet Kaynak, Thomas Zwick, Ahmet Cagri Ulusoy
Summary: We introduce an ultra wideband push-push based frequency doubler with differential outputs and a 3 dB-bandwidth from 4.8 to 80 GHz. By utilizing an on-chip active balun, the differential drive signal is achieved, enabling good fundamental rejection. Experimental results confirm the functionality of the circuit up to 100 GHz.
2022 IEEE 22ND TOPICAL MEETING ON SILICON MONOLITHIC INTEGRATED CIRCUITS IN RF SYSTEMS (SIRF)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Christian Bohn, Cagri Ulusoy
Summary: We present a linear transimpedance amplifier with 67 GHz bandwidth, offering high transimpedance and gain control modes, suitable for short-range PAM-4 electro/optical communications.
2022 IEEE/MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS 2022)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Christian Bohn, Joachim Hebeler, Christian Koos, Thomas Zwick, Ahmet Cagri Ulusoy
Summary: This paper compares two analog driver circuits for optical communication, which achieve low group delay variations and consume less power. Eye diagram measurements demonstrate the potential of the presented amplifier in next generation high data rate communication systems.
2021 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS)
(2021)
