Thermal conductance as a probe of the non-local order parameter for a topological superconductor with gauge fluctuations

We investigate the effect of quantum phase slips on a helical quantum wire coupled to a superconductor by proximity. The effective low-energy description of the wire is that of a Majorana chain minimally coupled to a dynamical $\mathbb{Z}_2$ gauge field. Hence the wire emulates a matter-coupled gauge theory, with fermion parity playing the role of the gauged global symmetry. Quantum phase slips lift the ground state degeneracy associated with unpaired Majorana edge modes at the ends of the chain, a change that can be understood as a transition between the confined and the Higgs-mechanism regimes of the gauge theory. We identify the quantization of thermal conductance at the transition as a robust experimental feature separating the two regimes. We explain this result by establishing a relation between thermal conductance and the Fredenhagen-Marcu string order-parameter for confinement in gauge theories. Our work indicates that thermal transport could serve as a measure of non-local order parameters for emergent or simulated topological quantum order.Comment: 5 pages, 2 figures; v2: different introduction, added references, updated figure 2; published version to appear in PR

The impact and correlation of the digital transformation on GDP growth in different regions Worldwide

[EN] Currently our society is experiencing a process of digital transfor- mation worldwide, in 2016 the digital economy accounted for 22.5% of the world economy. The digital transformation has enabled the creation of new business models, the generation of opportunities and the maximization of effi- ciency in traditional companies that have wanted to reconvert their business model towards a new digital environment and the culture of data orientation. This document contains an analysis of how the adoption of digital technologies has a positive influence on the growth of the world economy as a whole, and particularly on the growth of some regions of the world

Understanding transition performance during offshore IT outsourcing

Purpose - Within an IT outsourcing relationship, transition represents a critical and complex phase that starts immediately after contract signing. Transition involves handing over outsourced activities from client firm to service provider firm and accompanies a new way of operating. The purpose of this paper is to determine and detail factors influencing the performance of transition phase within global IT outsourcing relationships. Design/methodology/approach - In this paper, the authors present a framework for transition performance that includes four factors: transition planning, knowledge transfer, transition governance and retained organization. This framework is tested and enriched by utilizing a single, in-depth case study involving over 25 interviews with a global offshore IT outsourcing engagement. Findings - It was found that knowledge transfer and transition governance are more critical factors than transition planning and retained organization for transition performance. This was due mainly to two reasons: the critical challenges faced, within the scope of these factors, had higher potential to disrupt transition; and both these factors and their related issues required a significant joint and coordinated effort from client and service provider firms, thereby, making implementation challenging for transition. Originality/value - Practitioners have suggested that over two-thirds of failed outsourcing relationships are due to transition-related challenges. This paper represents one of the first in-depth studies that provides insights from a real-life global outsourcing engagement, which contributes to and complements existing literature on IT outsourcing by providing a greater understanding of transition. Furthermore, it provides practitioners with insights and best practices that can be used to guide transitions in real-life engagements

Realization of microwave quantum circuits using hybrid superconducting-semiconducting nanowire Josephson elements

We report the realization of quantum microwave circuits using hybrid superconductor-semiconductor Josephson elements comprised of InAs nanowires contacted by NbTiN. Capacitively-shunted single elements behave as transmon qubits with electrically tunable transition frequencies. Two-element circuits also exhibit transmon-like behavior near zero applied flux, but behave as flux qubits at half the flux quantum, where non-sinusoidal current-phase relations in the elements produce a double-well Josephson potential. These hybrid Josephson elements are promising for applications requiring microwave superconducting circuits operating in magnetic field.Comment: Main text: 4 pages, 4 figures; Supplement: 10 pages, 8 figures, 1 tabl

Topological phases in two-dimensional arrays of parafermionic zero modes.

Theoretical Physic