Engineering Stable Discrete-Time Quantum Dynamics via a Canonical QR Decomposition

We analyze the asymptotic behavior of discrete-time, Markovian quantum systems with respect to a subspace of interest. Global asymptotic stability of subspaces is relevant to quantum information processing, in particular for initializing the system in pure states or subspace codes. We provide a linear-algebraic characterization of the dynamical properties leading to invariance and attractivity of a given quantum subspace. We then construct a design algorithm for discrete-time feedback control that allows to stabilize a target subspace, proving that if the control problem is feasible, then the algorithm returns an effective control choice. In order to prove this result, a canonical QR matrix decomposition is derived, and also used to establish the control scheme potential for the simulation of open-system dynamics.Comment: 12 pages, 1 figur

Quantum Typicality and Initial Conditions

If the state of a quantum system is sampled out of a suitable ensemble, the measurement of some observables will yield (almost) always the same result. This leads us to the notion of quantum typicality: for some quantities the initial conditions are immaterial. We discuss this problem in the framework of Bose-Einstein condensates.Comment: 8 page

Global Politics and the Evolving EU-US-China Triangle: An Opportunity for EU Leadership? College of Europe Policy Brief #10.17, November 2017

Executive Summary > A changing global order requires actors aiming at global leadership to develop a flexible foreign policy approach to interdependence. > Given their material pre-eminence, it is particularly crucial to analyse how the US, China and the EU have been responding to the fluidity of the global system. > The structural primacy of the United States makes it hostile to reforming global governance, and the current Administration is veering towards a more withdrawn, unilateral approach to global issues which risks creating a ‘power vacuum’. > China has been greatly stepping up its global engagement, displaying pragmatic flexibility and promoting reform via inclusive, ‘horizontal’ leadership on many issues. > The EU, despite internal constraints, has been making important steps forward towards strategic pragmatism, especially via its 2016 Global Strategy. > In light of US disengagement, the EU’s effectiveness and legitimacy as a global actor could greatly benefit from co-leadership with an increasingly proactive China in a number of domains, especially those pertaining to the sustainable management of the global commons

Jean Carbonnier. Jurista, sociólogo y filósofo. La obra y su actualidad

Este artículo describe la figura intelectual, las obras, la sabiduría jurídica y la resonancia intelectual contemporánea de un gran jurista del siglo XX, el civilista y sociólogo del derecho francés Jean Carbonnier (1908-2003), y ofrece algunas indicaciones acerca del recibo en lengua española de sus ideas, en particular con referencia a la hipótesis del no-derecho.This article describes the intellectual figure, the works, the juridical wisdom and the intellectual contemporary resonance of a great jurist of the 20th century, the student of civil law and sociologist of law Jean Carbonnier (1908-2003), and offers some indications of the receipt in spanish language of his ideas, particularly those referring to the hypothesis of non-law

Brevi riflessioni sulla rappresentatività sindacale: tra la nozione di sindacato comparativamente rappresentativo e le rappresentanze sindacali unitarie

il contributo analizza le problematiche riscontrabili in materia di rappresentanza e rappresentatività sindacal

The ethical imperative in Edmund Husserl

[No abstract available

Sviluppo di una Metodologia per la Generazione del Modello Parametrico della Fusoliera e della Configurazione degli Interni per Velivoli da Trasporto.

Il lavoro verte sulla concezione e sviluppo, in ambiente Matlab, di un codice software preposto alla progettazione della fusoliera dei velivoli da trasporto passeggeri, in fase preliminare. Il codice è costituito da due moduli distinti, rispettivamente preposti al progetto parametrico della sezione maestra e della cabina di fusoliera, comprensiva degli allestimenti interni

Colecistectomia laparoscopica clipless con dissettore ad ultrasuoni versus colecistectomia laparoscopica tradizionale in regime di day surgery. Studio prospettico randomizzato

Il nostro studio nasce, dall’esigenza di valutare l’effettiva possibilità di utilizzare il dissettore ad ultrasuoni per eseguire la colecistectomia laparoscopica in day surgery sia come strumento di dissezione e coagulo che per sigillare il dotto cistico e l’arteria cistica. La colecistectomia laparoscopica clipless con dissettore ad ultrasuoni si è dimostrata una procedura efficace e sicura anche in regime di day surgery. L’utilizzo routinario del bisturi armonico non incide sui costi generali della procedura ed anzi consente un ipotetico risparmio rispetto alla colecistectomia laparoscopica tradizional

Perspectives in System Thermal-Hydraulics

The paper deals with three main topics: a) the definition of System Thermal-Hydraulics (SYS TH), b) a historical outline for SYS TH and, c) the description of elements for reflection when planning research projects or improvement activities, this last topic being the main reason for the paper. Distinctions between basic thermal-hydraulics and computational Fluid-Dynamics (CFD) on the one side and SYS TH on the other side are considered under the first topic; stakeholders in the technology are identified. The proposal of Interim Acceptance Criteria for Emergency Core Cooling Systems in 1971 by US NRC (AEC at the time) is recognized as the starting date or the triggering event for SYS TH (second topic). The complex codes and the main experimental programs (list provided in the paper) constitute the pillars for SYS TH. Caution or warning statements are introduced in advance when discussing the third topic: a single person (or a researcher) has little to no possibility, or capability, of streamlining the forthcoming investments or to propose a roadmap for future activities. Nevertheless, the ambitious attempt to foresee developments in this area has been pursued without constraints connected with the availability of funds and with industrial benefits or interests. Demonstrating the acceptability of current SYS TH limitations and training in the application of those codes are mentioned as the main challenges for forthcoming research activities