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Article
Report number	arXiv:2402.04322 ; TIF-UNIMI-2024-2
Title	Characterization of a Transmon Qubit in a 3D Cavity for Quantum Machine Learning and Photon Counting
Author(s)	D'Elia, Alessandro (Frascati) ; Alfakes, Boulos (Unlisted) ; Alkhazaleh, Anas (Unlisted) ; Banchi, Leonardo (Florence U. ; INFN, Florence) ; Beretta, Matteo (Frascati) ; Carrazza, Stefano (Unlisted ; INFN, Milan ; Milan U. ; Padua U. ; INFN, Padua ; CERN) ; Chiarello, Fabio (Frascati ; IFN, Rome) ; Di Gioacchino, Daniele (Frascati) ; Giachero, Andrea (Milan Bicocca U. ; INFN, Milan Bicocca) ; Henrich, Felix (Heidelberg U.) ; Komnang, Alex Stephane Piedjou (Frascati) ; Ligi, Carlo (Frascati) ; Maccarrone, Giovanni (Frascati) ; Macucci, Massimo (Pisa U.) ; Palumbo, Emanuele (Milan Bicocca U.) ; Pasquale, Andrea (Unlisted ; INFN, Milan ; Milan U. ; Padua U. ; INFN, Padua) ; Piersanti, Luca (Frascati) ; Ravaux, Florent (Unlisted) ; Rettaroli, Alessio (Frascati) ; Robbiati, Matteo (Milan U. ; CERN) ; Tocci, Simone (Frascati) ; Gatti, Claudio (Frascati)
Publication	2024-02-11
Imprint	2024-02-06
Number of pages	21
Note	code available at https://qibo.science
In:	Appl. Sciences 14 (2024) 1478
DOI	10.3390/app14041478 (publication)
Subject category	hep-ph ; Particle Physics - Phenomenology ; quant-ph ; General Theoretical Physics
Abstract	In this paper we report the use of superconducting transmon qubit in a 3D cavity for quantum machine learning and photon counting applications. We first describe the realization and characterization of a transmon qubit coupled to a 3D resonator, providing a detailed description of the simulation framework and of the experimental measurement of important parameters, like the dispersive shift and the qubit anharmonicity. We then report on a Quantum Machine Learning application implemented on the single-qubit device to fit the u-quark parton distribution function of the proton. In the final section of the manuscript we present a new microwave photon detection scheme based on two qubits coupled to the same 3D resonator. This could in principle decrease the dark count rate, favouring applications like axion dark matter searches.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2024 The authors (License: CC-BY-4.0)

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