Showing papers by "Benno Margesin published in 2021"
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TL;DR: In this article, the authors analyzed the intrinsic properties of a model architecture (i.e., an rf-SQUID based Josephson Traveling Wave Parametric Amplifier) in terms of amplification and noise generation for key case study input states (Fock and coherents).
Abstract: The advent of ultra-low noise microwave amplifiers revolutionized several research fields demanding quantum-limited technologies. Exploiting a theoretical bimodal description of a linear phase-preserving amplifier, in this contribution we analyze some of the intrinsic properties of a model architecture (i.e., an rf-SQUID based Josephson Traveling Wave Parametric Amplifier) in terms of amplification and noise generation for key case study input states (Fock and coherents). Furthermore, we present an analysis of the output signals generated by the parametric amplification mechanism when thermal noise fluctuations feed the device.
5 citations
TL;DR: In this paper, an electromechanical structure for a tuneable RF MEMS capacitor based on an inplane torsion generated by the in-plane forces developing during polarization of a parallel plate capacitor with partially overlapping electrodes is presented.
Abstract: The paper presents the design, modelling, fabrication and testing of a new electromechanical structure for a tuneable RF MEMS capacitor based on an in-plane torsion generated by the in-plane forces developing during polarization of a parallel plate capacitor with partially overlapping electrodes. The designs explore the possibility to exploit an in plane rotation to extend the dynamic tuning range of a variable capacitor beyond the limits of conventional parallel plate capacitor and to determine the obtainable dynamic ranges and the limitations. These first prototypes adopt a butterfly structure suspended above the fixed electrodes. A small pivot point underneath the center of the mobile electrode acts as rest point after the pull-in and low friction pivot point for the rotation. Different suspension springs have been explored. A first pull-in followed by a parabolic branch with continuous tuning and a second pull-in characterize the C/V measurements. The measurements show a measured capacitance ratio ranging from 1.1 up to 1.6 with a 0–50V bias voltage. The capacitance values measured range from 286 fF up to 687 fF depending on the device type. Theoretical analysis shows that the capacitance ratio can easily be increased by a factor of 20 simply by reducing the initial overlap of the electrodes.
1 citations
TL;DR: In this paper, the SIMP project (2019-2021) has been proposed to improve the sensitivity and the dark count rate of two types of photodetectors: current biased Josephson junction (JJ) for the frequency range 10-50 GHz and Transition Edge Sensor (TES) for frequency range 30-100 GHz.
Abstract: The Italian institute for nuclear physics (INFN) has financed the SIMP project (2019-2021) in order to strengthen its skills and technologies in the field of meV detectors with the ultimate aim of developing a single microwave photon detector. This goal will be pursued by improving the sensitivity and the dark count rate of two types of photodetectors: current biased Josephson Junction (JJ) for the frequency range 10-50 GHz and Transition Edge Sensor (TES) for the frequency range 30-100 GHz. Preliminary results on materials and devices characterization are presented.