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Quantum-Enhanced Pattern Recognition
Get PDFThe challenge of pattern recognition is to invoke a strategy that can accurately extract features of a dataset and classify its samples. In realistic scenarios, this dataset may be a physical system from which we want to retrieve information, such as in the readout of optical classical memories. The theoretical and experimental development of quantum reading has demonstrated that the readout of optical memories can be significantly enhanced through the use of quantum resources (namely, entangled input states) over that of the best classical strategies. However, the practicality of this quantum advantage hinges upon the scalability of quantum reading, and up to now its experimental demonstration has been limited to individual cells. In this work, we demonstrate quantum advantage at a fixed resource, namely, at fixed mean probe energy, in the multicell problem of pattern recognition. Through experimental realizations of digits from the Modified National Institute of Standards and Technology (MNIST) handwritten digit dataset, and the application of advanced classical postprocessing, we report the use of entangled probe states and photon counting to achieve quantum advantage in classification error over that achieved with classical resources, confirming that the advantage gained through quantum sensors can be sustained throughout pattern recognition and complex postprocessing. This motivates future developments of quantum-enhanced pattern recognition of bosonic loss within complex domains
Final report of SIM.L-K7.2016
Get PDFSince the line scale used in this comparison was planned to be used in the next EURAMET line scale comparison (originally planned as EURAMET.L‐K7.2019), the CCL WG-MRA (Meeting No 10, 17 –18 October 2019) decided that the KCRV of this comparison would be held secret until publication of the Draft B of the EURAMET.L‐K7.2019. Therefore, the initial version of Draft B did not contain the results of measurements and the KCRVs contained only the uncertainty budgets and the degrees of equivalence. With the action A.13 of the CCL WG-MRA (Meeting No 13, 8–10 November 2022) it was decided to submit the full report including KCRVs, for review and publication. This document supports the measurement capabilities of both the laboratories
Ensuring the validity of measurement results through the use of triangulation rules
Get PDFMeasurement results are critical in various industries, including healthcare, aerospace, and manufacturing. Inaccurate measurements can lead to severe
consequences, such as faulty medical diagnoses, airplane crashes, and defective products. Therefore, it is essential to ensure the validity of
measurement results to maintain the integrity and reliability of measurements.
To comply with the ISO/IEC 17025 standard, laboratories must demonstrate the validity of their measurement results [1]. They can achieve this by using the triangulation rules, which involves using multiple methods or instruments to measure the same quantity. By comparing the results of multiple measurements, laboratories can identify any discrepancies
METROLOGICAL CHARACTERIZATION OF DIGITAL MEMS ACCELEROMETERS IN DYNAMIC CONDITIONS: AN INVESTIGATION OF LINEARITY IN AMPLITUDE AND TEMPERATURE EFFECTS
Get PDFVirtual Training Laboratory for Primary Impedance Metrology
Get PDFThis article presents the concept and some aspects of the physical implementation of a virtual training laboratory
(VTL) in the field of primary impedance metrology. The creation of a VTL provides a novel method of disseminating metrological knowledge and expertise in a practical way and at a low cost. It will expose new users to the live experience of operating a digital impedance bridge thus helping to encourage the uptake
of this novel and useful impedance measurement technology. The VTL was developed as part of the EMPIR projects VersICal 17RPT04, A versatile electrical impedance calibration laboratory based on digital impedance bridges, and GIQS 18SIB07, Graphene impedance quantum standard
Characterization of Traveling-Wave Josephson Parametric Amplifiers at T = 0.3 K
Get PDFThe growing interest in quantum technologies, from fundamental physics experiments to quantum computing, demands for extremely performing electronics only adding the minimum amount of noise admitted by quantum mechanics to the input signal (i.e., quantum-limited electronics). Superconducting microwave amplifiers, due to their dissipationless nature, exhibit outstanding performances in terms of noise (quantum limited), and gain. However, bandwidth and saturation power still show space for substantial improvement. Within the DARTWARS1 collaboration, we are developing state-of-the-art microwave superconducting amplifiers based on Josephson junction arrays and on distributed kinetic inductance transmission lines. Here we report the realization of a setup for the characterization of the performances of Josephson traveling-wave parametric amplifiers at a temperature of 300 mK.
Although in the final experimental setup, these amplifiers will operate at a base temperature of about 20 mK, their characterization at 300 mK allows to evidence the main aspects of their performances, but the ultimate noise level. This represents a quick and relatively inexpensive way to test these superconductive devices that can be of help to improve their design and fabrication
Speed of sound measurements of two binary natural gas mixtures (methane plus n-butane and methane plus isopentane) at cryogenic temperatures and in liquid phase
Get PDFThis paper presents accurate speed of sound measurements in two specific single-phase liquefied natural gas mixtures (methane + isopentane and methane +n-butane) for temperatures ranging from (100 to 160) K and pressures up to 12 MPa, with expanded relative uncertainties (k = 2) between (0.27 and 0.35) % for methane + n-butane and between (0.26 and 0.30) % for the methane + isopentane. These measurements have been obtained using the double pulse-echo technique. The experimental results of these measurements were compared with the values predicted by the GERG-2008 model and the most recent fundamental equation of state for the calculation of thermodynamic properties of liquefied natural gases, EOS-LNG
Nuovo sistema di monitoraggio delle temperature dei laboratori
No full textDopo diversi anni di servizio del vecchio sistema Labview, è stato installato e configurato un nuovo sistema di monitoraggio delle temperature dei laboratori (Forza, Accelerazione, Durezze) all’interno del padiglione Bray. Il nuovo sistema è basato su un datalogger che si occupa dell’acquisizione e memorizzazione dei dati coadiuvato da un server MySQL su cui sono replicati i risultati delle misure. La visualizzazione e ricerca dei dati è affidata ad un'interfaccia sviluppata utilizzando la piattaforma Grafana, oltre al software fornito dal costruttore del datalogger e il display presente a bordo dispositivo. Si è scelto di utilizzare la piattaforma Grafana in quanto la visualizzazione e ricerca dei valori misurati risultano più agevoli ed intuitivi, fornendo inoltre la possibilità di accesso remoto. Il sistema effettua una lettura ogni 2 minuti ed il valor medio viene salvato ogni 30 minuti sia sul dispositivo, sia nel database MySQL ospitato sul relativo server. Con questo intervallo di lettura si stima la saturazione della memoria del datalogger tra circa 35 anni, al termine del quale inizieranno ad essere sovrascritti i valori più vecchi
