Search results for "PARADOXES"

Anti-Zeno-based dynamical control of the unfolding of quantum Darwinism

2020

We combine the collisional picture for open system dynamics and the control of the rate of decoherence provided by the quantum (anti-)Zeno effect to illustrate the temporal unfolding of the redundant encoding of information into a multipartite environment that is at the basis of Quantum Darwinism, and to control it. The rate at which such encoding occurs can be enhanced or suppressed by tuning the dynamical conditions of system-environment interaction in a suitable and remarkably simple manner. This would help the design of a new generation of quantum experiments addressing the elusive phenomenology of Quantum Darwinism and thus its characterization.

Zeno-like phenomena in STIRAP processes

2011

The presence of a continuous measurement quantum Zeno effect in a stimulated Raman adiabatic passage is studied, exploring in detail a sort of self-competition of the damping, which drives the system toward a loss of population and, at the same time, realizes the conditions for optimizing the adiabatic passage.

Role of temperature in the occurrence of some Zeno phenomena

2012

Temperature can be responsible for strengthening effective couplings between quantum states, determining a hierarchy of interactions, and making it possible to establish such dynamical regimes known as Zeno dynamics, wherein a strong coupling can hinder the effects of a weak one. The relevant physical mechanisms which connect the structure of a thermal state with the appearance of special dynamical regimes are analyzed in depth.

Hilbert space partitioning for non-Hermitian Hamiltonians: From off-resonance to Zeno subspaces

2020

Abstract Effective non-Hermitian Hamiltonians describing decaying systems are derived and analyzed in connection with the occurrence of possible Hilbert space partitioning, resulting in a confinement of the dynamics. In some cases, this fact can be interpreted properly as Zeno effect or Zeno dynamics, according to the dimension of the subspace one focuses on; in some other cases, the interpretation is more complicated and traceable back to a mix of Zeno phenomena and lack of resonance. Depending on the complex phases of the diagonal terms of the Hamiltonian, the system reacts in different ways, requiring larger moduli for the dynamical confinement to occur when the complex phase is close to…

MR3105981 81Q12 Znojil, Miloslav (CZ-AOS-N) The Coulomb potential and the paradoxes of PT symmetrization. J. Engrg. Math. 82 (2013), 173–185.

2014

Zeno dynamics and high-temperature master equations beyond secular approximation

2013

Complete positivity of a class of maps generated by master equations derived beyond the secular approximation is discussed. The connection between such class of evolutions and physical properties of the system is analyzed in depth. It is also shown that under suitable hypotheses a Zeno dynamics can be induced because of the high temperature of the bath.

From Zeno to Chrysippus

2015

This chapter is about the origin and development of early Stoic epistemology. I discuss how Zeno of Citium, the founder of the Stoa, was influenced by his predecessors and interpreted by his successors. I argue that Stoicism rely on two basic assumptions for which Socrates is the main predecessor, namely that human beings are at home in the world and that it is only by using our rational abilities to detect salient truths and organize them into skills that we can successfully orient ourselves in this world. This Socratic-Stoic position relies on a naturalistic theory of concept acquisition, for which Aristotle is the main predecessor, or so I argue. I then look at how Zeno’s original episte…

François Miron ou les paradoxes d’une carrière d’officier de finances au XVIe siècle

2015

International audience

"Une façon de grand insecte noire" : le télégraphe aérien ou les paradoxes du progrès (1830-1848)

2010

International audience

Texture et paradoxes auditifs dans la musique récente de Michaël Levinas

2020

Parmi les courants musicaux apparus après 1945, le spectralisme a été celui dont les fondements théoriques, les techniques d’écriture et les sources d’inspiration ont été le plus fécondés par les recherches en acoustique, en psychoacoustique et en perception de la musique. Les questionnements musicaux de Michaël Levinas, comme ceux de Grisey, Murail, Dufourt, Saariaho, Hurel, Dalbavie, Maresz et d’autres, se sont nourris de notions telles que spectre, transitoires, résonance, battements, sons de combinaison, inharmonicité, rugosité, seuil perceptif,masquage, effet Doppler, etc. Cependant, s’il partage avec ses collègues ce socle de connaissances, elles ne l’ont pas conduit aux mêmes solutio…