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Real-Time Monitoring of Temperature-Dependent Structural Transitions in DNA Nanomechanical Resonators: Unveiling the DNA-Ligand Interactions for Biomedical Applications
Get PDFBroadband serrodyne phase modulation for optical frequency standards and spectral purity transfer
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Mathmet Measurement Uncertainty Training activity – Overview of courses, software, and classroom examples
Get PDFA collaborative activity on “Measurement Uncertainty (MU) Training” under the auspices of the European Metrology Network for
Mathematics and Statistics (Mathmet) is underway. This abstract reports on the progress to undertake surveys of existing training
courses on MU, software for MU evaluation, and classroom examples to support the understanding of methods for MU evaluation. An
appreciable number of training courses, software and examples have been identified and are currently under review. These tools and
materials will be analysed and categorised according to their main features and characteristics. Special attention will be given to their
adherence to the JCGM guidelines (i.e., JCGM 100:2008, JCGM 101:2008 and JCGM 102:2011). It is hoped that the knowledge assembled
in this activity will help practitioners to make good choices about appropriate material to support their training needs, as well as help
developers of training material to ensure good coverage of their training products and target them at user needs
Internal reflections and nonlinear effects interplay in non-ideal Josephson Travelling Wave Parametric Amplifiers
Get PDFThe paper investigates the interplay of nonlinear effects with the non-ideal transmission properties of a Josephson Travelling Wave Parametric Amplifier (JTWPA). Experimental characterization using a microwave and DC cryogenic setup
reveals periodic transmission modulation linked to the tuning of
the Josephson inductances embedded in the line. The effects of
impedance matching and resonant parametric down-conversion
(PDC) are observed on a broadband scale, and the impact of de sign parameters and fabrication issues on device performance is analyzed. These findings contribute to the optimizing techniques for JTWPA devices, advancing quantum-limited amplifiers
Non-Contact Thermometer for Improved Air Temperature Measurements
Get PDFA compact thermometer for air temperature based on the measurement of the speed of sound was developed at INRIM. This paper focuses on the comparison of this instrument with platinum resistance thermometers in a climatic chamber over a temperature range (-30 divided by +55) degrees C, relative humidity (10 divided by 90)%rh, and irradiation (>1 kW/m(2)) values similar to those of surface atmospheric conditions. Overall uncertainty values of 0.2 degrees C over the range from -30 degrees C to +30 degrees C, and from 0.6 degrees C to +55 degrees C, were found. Moreover, the instrument proved to be immune to irradiation errors and free from the need for temperature calibration
Experimental characterization of RF-SQUIDs based Josephson Traveling Wave Parametric Amplifier exploiting Resonant Phase Matching scheme
No full textIn this contribution, we will present recent advances on Josephson Traveling Wave Parametric Amplifiers (JTWPAs) developed and tested at the Italian National Research Institute of Metrology (INRiM). JTWPAs are engineered micro-structured metamaterials composed of a repetition of several hundreds of Josephson junctions embedded in a superconducting coplanar
waveguide. The Josephson junctions confer to the material a non-linear behavior and promote a medium-mediated energy exchange, known as parametric down-conversion, between a strong propagating microwave tone and a couple of energy-preserving weak tones, called respectively signal and idler. This working principle makes the JTWPAs both an important tool for quantum limited broadband microwave amplification (i.e., with the smallest added noise allowed by the uncertainty principle) and for the emission of non-classical microwave radiation, being the signal and idler tones composed by entangled photons, exploitable in a wide variety of quantum sensing techniques such as quantum illumination, and quantum key distribution or for absolute calibration of microwave single photon detectors.
In particular, we will present experimental characterization of an Al/Al-Ox/Al rf-SQUIDs-based JTWPA equipped with a resonant phase matching scheme [8], designed using finite element
electromagnetic simulations in order to mitigate some typical unwanted effects like energy dissipation in higher-harmonics, internal reflections due to impedance mismatch and generation of slot line modes. The performance of this device, measured in a properly equipped dilution refrigerator (T<50mK), will be quantified in terms of classical quantities like gain, bandwidth, and saturation power, while the signature of the emission of non-classical radiation will be detected employing IQ voltage quadratures correlation measurements
