OAR@UM Collection:

A data analysis application for a systematic reporting of dielectric properties of biological tissue

Tue, 01 Aug 2023 00:00:00 GMT

Title: A data analysis application for a systematic reporting of dielectric properties of biological tissue Authors: Bonello, Julian; Farrugia, Lourdes; Cutajar, Denis; Godinho, Daniela; Conceição, Raquel; Farhat, Iman; Sammut, Charles V. Abstract: The dielectric properties of biological tissues are the basis of new and existing medical devices which utilise microwaves. To date, numerous studies have been published which report on the dielectric properties for various biological tissues. When examining published literature, it is apparent that discrepancies in the methodology exist along with the way the data is analysed and reported. In this work, we present a data analysis application developed in Matlab which allows the user to import multiple dielectric data files and analyse them simultaneously. The analysis is developed as per a best-practices guidelines developed as consensus work within the COST MyWAVE network. [excerpt]

Practical analysis of decoy method in QKD over underwater optical fiber

Sun, 01 Jan 2023 00:00:00 GMT

Title: Practical analysis of decoy method in QKD over underwater optical fiber Authors: Bacco, Davide; Ribezzo, Domenico; Zahidy, Mujtaba; De Lazzari, Claudia; Vagniluca, Ilaria; Petitjean, Antoine; Lemmi, Gianmarco; Occhipinti, Tommaso; Cataliotti, Francesco Saverio; Oxenløwee, Leif K.; Xuereb, Andre; Zavatta, Alessandro Abstract: Quantum key distribution (QKD) is the first commercial application of the second quantum revolution. Although QKD systems have already been developed and implemented all around the world, some open challenges are limiting the overall deployment of this technology (limited key rate, limited link distance, etc.). By improving the current QKD protocols, it is possible to increase the final secret key generation rate. In this work, we compare 1-decoy with 2-decoy methods in BB84 protocol over an underwater optical fiber link connecting Malta to Italy, showing that 2-decoy can achieve more than twice the key rate of 1-decoy method.

Deterministic quantum computation with one-clean-qubit model as an open quantum system

Sun, 01 Jan 2023 00:00:00 GMT

Title: Deterministic quantum computation with one-clean-qubit model as an open quantum system Authors: Xuereb, Jake; Campbell, Steve; Goold, John; Xuereb, Andre Abstract: The deterministic quantum computation with one-clean-qubit model (DQC1) complexity class, or power-ofone qubit model, is examined as an open quantum system.We study the dynamics of a register of qubits carrying out a DQC1 algorithm and show that, for any algorithm in the complexity class, the evolution of the logical qubit can be described as an open quantum system undergoing a dynamics which is unital. Unital quantum channels respect the Tasaki-Crooks fluctuation theorem, and we demonstrate how this is captured by the thermodynamics of the logical qubit. As an application, we investigate the equilibrium and nonequilibrium thermodynamics of the DQC1 trace estimation algorithm. We show that different computational inputs, i.e., different traces being estimated, lead to different energetic exchanges across the register of qubits and that the temperature of the logical qubit impacts the magnitude of fluctuations experienced and quality of the algorithm.

The JWST hubble sequence : the rest-frame optical evolution of galaxy structure at 1.5
Sun, 01 Jan 2023 00:00:00 GMT
Title: The JWST hubble sequence : the rest-frame optical evolution of galaxy structure at 1.5 109 M⊙ at z > 3 are not dominated by irregular and peculiar structures, either visually or quantitatively, as previously thought. We find a strong dominance of morphologically selected disk galaxies up to z = 6 in this mass range. We also find that the stellar mass and star formation rate densities are dominated by disk galaxies up to z ∼ 6, demonstrating that most stars in the Universe were likely formed in a disk galaxy. We compare our results to theory to show that the fraction of types we find is predicted by cosmological simulations, and that the Hubble Sequence was already in place as early as one billion years after the Big Bang. Additionally, we make our visual classifications public for the community.