Manufacturing SMEs Competitiveness against the Crisis: Management Characteristics and New Perspectives

The purpose of this paper is to study the drivers of competitiveness in sectors of the Greek manufacturing industry, both in the pro and post economic crisis era, based on firm level financial and qualitative data cover this gap, providing evidence about factors impact competitive dynamic of Greek manufacturing SMEs taking into account aspects of IT, knowledge management, training, innovation and financial ratios. The study is structured as follows: the next section presents a literature review on this subject, while section 3 highlight the methodology as well as the model approach of the study. In section 4, the empirical results of the study are presented and section 5 the main findings are discussed. Section 6 summarizes the empirical findings and draws the policy implications of the study

Strong-field effects induced in the extreme ultraviolet domain

Motivated by the achieved high intensities of novel extreme ultraviolet (XUV) radiation sources, such as free electron lasers and laser-driven high harmonic generation beamlines, we elaborate on their perspective in inducing observable strong field effects. The feasibility of extending such effects from the infrared and visible spectral regimes in the XUV domain is supported through numerically calculated models of near-future experiments. We highlight the advancement of performing studies in the time domain, using ultra-short XUV pulses, which allows for the temporal evolution of such effects to be followed. Experimental and theoretical obstacles and limitations are further discussed. © The Author(s), 2020. Published by Cambridge University Press in association with Chinese Laser Press

Strong laser fields and their power to generate controllable high-photon-number coherent-state superpositions

Recently, intensely driven laser-matter interactions have been used to connect the fields of strong laser field physics with quantum optics by generating non-classical states of light. Here, we make a further key step and show the potential of strong laser fields for generating controllable high-photon-number coherent-state superpositions. This has been achieved by using two of the most prominent strong-laser induced processes: high-harmonic generation and above-threshold ionization. We show how the obtained coherent-state superpositions change from an optical Schr\"odinger "cat" state to a "kitten" state by changing the atomic density in the laser-atom interaction region, and we demonstrate the generation of a 9-photon shifted optical "cat" state which, to our knowledge, is the highest photon number optical "cat" state experimentally reported. Our findings anticipate the development of new methods that naturally lead to the creation of high-photon-number controllable coherent-state superpositions, advancing investigations in quantum technology.Comment: Revised version submitted to Physical Review

Entanglement and squeezing of the optical field modes in high harmonic generation

Squeezing of optical fields, used as a powerful resource for many applications, and the radiation properties in the process of high harmonic generation have thus far been considered separately. In this Letter, we want to clarify that the joint quantum state of all the optical field modes in the process of high harmonic generation is in general entangled and squeezed. We show that this is already the case in the simplest scenario of driving uncorrelated atoms by a classical laser light field. The previous observation of product coherent states after the high harmonic generation process is a consequence of the assumption that the ground state depletion can be neglected, which is related to vanishing dipole moment correlations. Furthermore, we analyze how the resulting quadrature squeezing in the fundamental laser mode after the interaction can be controlled and explicitly show that all field modes are entangled.Comment: 4 pages (2 figures

Quantum Optical Analysis of High-Order Harmonic Generation in Semiconductors

The following sections are included: Introduction Semiclassical Analysis of the Light-Matter Interaction Quantum Optical Analysis of the Light-Matter Interaction Outlook Acknowledgments Reference