Search results for "tangle"

CONSIDERAZIONI TEORICHE E PRATICHE SUL METODO DEL MASSIMO RETTANGOLO CIRCOSCRITTO PER LA VALUTAZIONE DELL’AMPIEZZA DELLA TENSIONE TANGENZIALE NEI CRI…

2012

The multiaxial fatigue criteria based on the approach of the critical plane require the determination of the amplitude of the alternating shear stress τ aacting on different planes passing through the point of the material analyzed. In the case of non-proportional stresses the shear stress vector varies both in modulus and direction and its tip describes a curvedefined loading path. In these cases τ ais identified and evaluated by means of special procedures the most recent, and apparently more effective, of which is that of the Maximum Circumscribed Rectangle (MCR) to the loading path itself. In particular τ ais equal to the length of the diagonal of the MCR. In this paper, the MCR method …

A Diffractive Reading

2023

AbstractTowards the end of the editing process, we started to see the book as something more than a collection of chapters around a theme: as an assemblage, which included, of course, the community of authors. When we put out the first call for contributions in May 2018, most authors volunteered a contribution rather quickly, others joined a bit later, and some dropped out for different reasons, underlining the dynamic nature of our assemblage. In pre-pandemic times, we met on and off campus, introduced some of our ideas at conferences, and had a workshop day to brainstorm, plan chapters, and reflect on the process and the purpose of the book. We were connected by common meals, jokes, writi…

Nonclassical correlations in superconducting circuits

2009

A key step on the road map to solid-state quantum information processing (and to a deeper understanding of many counterintuitive aspects of quantum mechanics) is the generation and manipulation of nonclassical correlations between different quantum systems. Within this framework, we analyze the possibility of generating maximally entangled states in a system of two superconducting flux qubits, as well as the effect of their own environments on the entanglement dynamics. The analysis reported here confirms that the phenomena of sudden birth and sudden death of the entanglement do not depend on the particular measure of the entanglement adopted.

Characterizing and Quantifying Frustration in Quantum Many-Body Systems

2011

We present a general scheme for the study of frustration in quantum systems. We introduce a universal measure of frustration for arbitrary quantum systems and we relate it to a class of entanglement monotones via an exact inequality. If all the (pure) ground states of a given Hamiltonian saturate the inequality, then the system is said to be inequality saturating. We introduce sufficient conditions for a quantum spin system to be inequality saturating and confirm them with extensive numerical tests. These conditions provide a generalization to the quantum domain of the Toulouse criteria for classical frustration-free systems. The models satisfying these conditions can be reasonably identifi…

Can future observation of the living partner post-tag the past decayed state in entangled neutral K mesons?

2019

Entangled neutral K mesons allow for the study of their correlated dynamics at interference and decoherence times not accessible in any other system. We find novel quantum phenomena associated to a correlation in time between the two partners: The past state of the first decayed kaon, when it was entangled before its decay, is post-tagged by the result and the time of the future observation of the second decay channel. This surprising "from future to past"effect is fully observable and leads to the unique experimental tag of the KS state, an unsolved problem since the discovery of CP violation.

Quantum fluctuations and correlations in equilibrium and nonequilibrium thermodynamics

2014

INVESTIGATION, REALIZATION, AND ENTANGLEMENT CHARACTERIZATION OF COMPLEX OPTICAL QUANTUM STATES

2020

All-Possible-Couplings Approach to Measuring Probabilistic Context.

2013

From behavioral sciences to biology to quantum mechanics, one encounters situations where (i) a system outputs several random variables in response to several inputs, (ii) for each of these responses only some of the inputs may "directly" influence them, but (iii) other inputs provide a "context" for this response by influencing its probabilistic relations to other responses. These contextual influences are very different, say, in classical kinetic theory and in the entanglement paradigm of quantum mechanics, which are traditionally interpreted as representing different forms of physical determinism. One can mathematically construct systems with other types of contextuality, whether or not …

Hajautetut mikromaksut esineiden internetissä

2018

Tämä tutkimus käsittelee mikromaksuja esineiden internetin kontekstissa vertaisarvioidun tieteellisen aineiston, teknisten valkopapereiden sekä kirjallisuuden avulla. Tutkielmassa tarkastellaan perinteisten mikromaksujen problematiikkaa ja tutkitaan mitä etuja hajautetut tilikirjatekniikat tuovat perinteisiin keskitettyihin mikromaksumenetelmiin verrattuna. Lopuksi tarkastellaan, minkälaisia käyttötapauksia mikromaksuille on esineiden internetissä sekä miten hajautetut maksuratkaisut voidaan sulauttaa osaksi esineiden internetin kokonaisarkkitehtuuria. Tutkielma esittelee myös mikromaksuja ja hajautettuja maksuverkkoja hyödyntävän älyparkkihalli-sovellutuksen. This thesis stud…

Rhombi-chain Bose-Hubbard model: Geometric frustration and interactions

2018

We explore the effects of geometric frustration within a one-dimensional Bose-Hubbard model using a chain of rhombi subject to a magnetic flux. The competition of tunnelling, self-interaction and magnetic flux gives rise to the emergence of a pair-superfluid (pair-Luttinger liquid) phase besides the more conventional Mott-insulator and superfluid (Luttinger liquid) phases. We compute the complete phase diagram of the model by identifying characteristic properties of the pair-Luttinger liquid phase such as pair correlation functions and structure factors and find that the pair-Luttinger liquid phase is very sensitive to changes away from perfect frustration (half-flux). We provide some propo…