45 citations · 137 across the 16 of their papers we have counts for
17 papers
Good practice guide on the graphene-based AC-QHE realization of the farad
Luca Callegaro, Stephan Bauer, Blaise Jeanneret +4
This Good Practice Guide provides information for the realization of the farad from the quantum Hall resistance in graphene devices by using digital impedance bridges. The fabricat…
Nonconventional Quantized Hall Resistances Obtained with Equilibration in Epitaxial Graphene Junctions
Albert F. Rigosi, Dinesh Patel, Martina Marzano +9
We have demonstrated the millimeter-scale fabrication of monolayer epitaxial graphene junction devices using simple ultraviolet photolithography, thereby significantly reduci…
Comment on "Physics without determinism: Alternative interpretations of classical physics", Phys. Rev. A, 100:062107, Dec 2019
Luca Callegaro, Francesca Pennecchi, Walter Bich
The paper "Physics without determinism: Alternative interpretations of classical physics" [Phys. Rev. A, 100:062107, Dec 2019] defines finite information quantities (FIQ). A FIQ ex…
A quantum model for rf-SQUIDs based metamaterials enabling 3WM and 4WM Travelling Wave Parametric Amplification
Angelo Greco, Luca Fasolo, Alice Meda +2
A quantum model for Josephson-based metamaterials working in the Three-Wave Mixing (3WM) and Four-Wave Mixing (4WM) regimes at the single-photon level is presented. The transmissio…
Calibration setup for ultralow-current transresistance amplifiers
Ilaria Finardi, Luca Callegaro
We describe a calibration setup for the transresistance of low-current amplifiers, based on the capacitance-charging method. The calibration can be performed in the current range o…
Electrical Resistance Tomography of Conductive Thin Films
Alessandro Cultrera, Luca Callegaro
The Electrical Resistance Tomography (ERT) technique is applied to the measurement of sheet conductance maps of both uniform and patterned conductive thin films. Images of the shee…
Circuit models and SPICE macro-models for quantum Hall effect devices
Massimo Ortolano, Luca Callegaro
Quantum Hall effect (QHE) devices are a pillar of modern quantum electrical metrology. Electrical networks including one or more QHE elements can be used as quantum resistance and…
On the calibration of direct-current current transformers
Luca Callegaro, Cristina Cassiago, Enrico Gasparotto
Modern commercial direct-current current transformers (DCCT) can measure currents up to the kA range with accuracies better than 1E-5. We discuss here a DCCT calibration method and…
A three-arm current comparator bridge, for impedance comparisons over the complex plane
Luca Callegaro, Vincenzo D'Elia, Massimo Ortolano +1
We present here the concept of three-arm current comparator impedance bridge, which allows comparisons among three unlike impedances. Its purpose is the calibration of impedances h…
Experiences with a two terminal-pair digital impedance bridge
Luca Callegaro, Vincenzo D'Elia, Marian Kampik +3
This paper describes the realization of a two terminal-pair digital impedance bridge and the test measurements performed with it. The bridge, with a very simple architecture, is ba…
Generation of reference dc currents at 1 nA level with the capacitance-charging method
Luca Callegaro, Pier Paolo Capra, Vincenzo D'Elia +1
The capacitance-charging method is a well-established and handy technique for the generation of dc current in the 100 pA range or lower. The method involves a capacitance standard…
On the synthesis of Quantum Hall Array Resistance Standards
Massimo Ortolano, Marco Abrate, Luca Callegaro
Quantum Hall effect (QHE) is the basis of modern resistance metrology. In Quantum Hall Array Resistance Standards (QHARS), several individual QHE elements, each one having the same…
Bridge connection of quantum Hall elementary devices
Luca Callegaro, Massimo Ortolano
Multiple-series and multiple-parallel connections of quantum Hall elementary devices allow the realization of multiple or fractional values of the quantized Hall resistance, reject…
Matrix method analysis of quantum Hall effect device connections
Massimo Ortolano, Luca Callegaro
The modelling of electrical connections of single, or several, multiterminal quantum Hall effect (QHE) devices is relevant for electrical metrology: it is known, in fact, that cert…
Realization of the farad from the dc quantum Hall effect with digitally-assisted impedance bridges
Luca Callegaro, Vincenzo D'Elia, Bruno Trinchera
A new traceability chain for the derivation of the farad from dc quantum Hall effect has been implemented at INRIM. Main components of the chain are two new coaxial transformer bri…
An absolute Johnson noise thermometer
Luca Callegaro, Vincenzo D'Elia, Marco Pisani +1
We developed an absolute Johnson noise thermometer (JNT), an instrument to measure the thermodynamic temperature of a sensing resistor, with traceability to voltage, resistance and…
Very simple FET amplifier with a voltage noise floor less than 1 nV/sqrt(Hz)
Luca Callegaro, Marco Pisani, Alessio Pollarolo
A field-effect transistor (FET) amplifier for small voltage signals is presented. Its design is elementary and the construction can be afforded by anyone. Despite its simplicity, w…