ABOUT CONDITIONS OF TWO-LEVEL SYSTEM OF EDUCATION AND SPECIALIST’S PROGRAM IN RUSSIA

2018 ◽  
Keyword(s):  
Level System

Quantum description of light–matter coupling

2017 ◽  
Author(s):  
Alexey V. Kavokin ◽  
Jeremy J. Baumberg ◽  
Guillaume Malpuech ◽  
Fabrice P. Laussy
Keyword(s):  
Cavity Mode ◽  
Optical Field ◽  
Level System ◽  
Bloch Equations ◽  
Optical Bloch Equations ◽  
Matter Coupling ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Full Quantum ◽  
The Ideal

In this chapter we study with the tools developed in Chapter 3 the basic models that are the foundations of light–matter interaction. We start with Rabi dynamics, then consider the optical Bloch equations that add phenomenologically the lifetime of the populations. As decay and pumping are often important, we cover the Lindblad form, a correct, simple and powerful way to describe various dissipation mechanisms. Then we go to a full quantum picture, quantizing also the optical field. We first investigate the simpler coupling of bosons and then culminate with the Jaynes–Cummings model and its solution to the quantum interaction of a two-level system with a cavity mode. Finally, we investigate a broader family of models where the material excitation operators differ from the ideal limits of a Bose and a Fermi field.

scholarly journals Revealing the nonlinear response of a tunneling two-level system ensemble using coupled modes

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Naftali Kirsh ◽  
Elisha Svetitsky ◽  
Alexander L. Burin ◽  
Moshe Schechter ◽  
Nadav Katz
Keyword(s):  
Nonlinear Response ◽  
Level System ◽  
Coupled Modes

Density matrix and purity evolution in dissipative two-level systems: II. Relaxation

2021 ◽  
Author(s):  
Sambarta Chatterjee ◽  
Nancy Makri
Keyword(s):  
Density Matrix ◽  
Time Evolution ◽  
Reduced Density Matrix ◽  
Level System ◽  
Two Level Systems ◽  
Reduced Density ◽  
Harmonic Bath

We investigate the time evolution of the reduced density matrix (RDM) and its purity in the dynamics of a two-level system coupled to a dissipative harmonic bath, when the system is initially placed in one of its eigenstates.

Dynamic squeezing in a single-mode boson field interacting with two-level system

2003 ◽  
Vol 101 (1-2) ◽  
pp. 101-114 ◽  
Author(s):  
T. Sandu ◽  
V. Chihaia ◽  
W.P. Kirk
Keyword(s):  
Single Mode ◽  
Boson Field ◽  
Level System

The ECtHR, transregional dialogues and global constitutionalism

2020 ◽  
Vol 9 (3) ◽  
pp. 543-551
Author(s):  
WAYNE SANDHOLTZ
Keyword(s):  
Human Rights ◽  
Legal Order ◽  
Level System ◽  
Global Order ◽  
European Court ◽  
Human Rights Treaties ◽  
Global Constitutionalism ◽  
Multi Level ◽  
Global Law ◽  
Decentralized Mechanism

AbstractIn A Cosmopolitan Legal Order, Stone Sweet and Ryan suggest that ‘from the standpoint of global law, we see that the [European Court of Human Rights] has taken its place in a pluralist, rights-based international order, as one trustee of this global order’. This article is a preliminary attempt to evaluate signs of movement toward global rights review. A multi-level charter of rights exists in the network of international and regional human rights treaties and in national constitutions. An incipient structure of global rights review exists in the form of the regional human rights courts, which see themselves as trustees of the larger global human rights system. Judicial dialogue among the regional courts allows for informal, decentralized coordination among them. The European Court of Human Rights serves as a point of reference for the African and Inter-American systems, though these also cite each other. Transregional judicial dialogue establishes a rudimentary, informal and decentralized mechanism of coordination among bodies that exercise a review function in the multi-level system of international human rights.

scholarly journals Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Tao Chen ◽  
Wei Gou ◽  
Dizhou Xie ◽  
Teng Xiao ◽  
Wei Yi ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
State Of The Art ◽  
Cold Atom ◽  
Pt Symmetry ◽  
Level System ◽  
Flexible Control ◽  
Time Symmetry ◽  
Symmetry Phase ◽  
Lattice Quantum ◽  
Atomic Momentum

AbstractWe experimentally study quantum Zeno effects in a parity-time (PT) symmetric cold atom gas periodically coupled to a reservoir. Based on the state-of-the-art control of inter-site couplings of atoms in a momentum lattice, we implement a synthetic two-level system with passive PT symmetry over two lattice sites, where an effective dissipation is introduced through repeated couplings to the rest of the lattice. Quantum Zeno (anti-Zeno) effects manifest in our experiment as the overall dissipation of the two-level system becoming suppressed (enhanced) with increasing coupling intensity or frequency. We demonstrate that quantum Zeno regimes exist in the broken PT symmetry phase, and are bounded by exceptional points separating the PT symmetric and PT broken phases, as well as by a discrete set of critical coupling frequencies. Our experiment establishes the connection between PT-symmetry-breaking transitions and quantum Zeno effects, and is extendable to higher dimensions or to interacting regimes, thanks to the flexible control with atoms in a momentum lattice.

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