QUANTUM DECOHERENCE AND TIME SYMMETRY BREAKING

2000 ◽  
pp. 173-190
Author(s):  
T. PETROSKY ◽  
V. BARSEGOV
Keyword(s):  
Symmetry Breaking ◽  
Quantum Decoherence ◽  
Time Symmetry

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.

scholarly journals Manifestation of the spontaneous parity-time symmetry breaking phase transition in hot-electron photodetection based on a tri-layered metamaterial

Nanophotonics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 495-504 ◽  
Author(s):  
Qiang Bai
Keyword(s):  
Phase Transition ◽  
Theoretical Model ◽  
Symmetry Breaking ◽  
Pt Symmetry ◽  
Coupled Mode Theory ◽  
Hot Electron ◽  
Electron Device ◽  
Coupled Mode ◽  
Time Symmetry ◽  
Existence Conditions

AbstractWe theoretically and numerically demonstrate that the spontaneous parity-time (PT) symmetry breaking phase transition can be realized respectively by using two independent tuning ways in a tri-layered metamaterial that consists of periodic array of metal-semiconductor Schottky junctions. The existence conditions of PT symmetry and its phase transition are obtained by using a theoretical model based on the coupled mode theory. A hot-electron photodetection based on the same tri-layered metamaterial is proposed, which can directly show the spontaneous PT symmetry breaking phase transition in photocurrent and possesses dynamical tunability and switchability. This work extends the concept of PT symmetry into the hot-electron photodetection, enriches the functionality of the metamaterial and the hot-electron device, and has varieties of potential and important applications in optoelectronics, photodetection, photovoltaics, and photocatalytics.

Single-mode laser by parity-time symmetry breaking

Science ◽  
2014 ◽  
Vol 346 (6212) ◽  
pp. 972-975 ◽  
Author(s):  
L. Feng ◽  
Z. J. Wong ◽  
R.-M. Ma ◽  
Y. Wang ◽  
X. Zhang
Keyword(s):  
Symmetry Breaking ◽  
Single Mode ◽  
Mode Laser ◽  
Single Mode Laser ◽  
Time Symmetry

Unidirectional Bragg Gratings Using Parity-Time Symmetry Breaking in Plasmonic Systems

2016 ◽  
Vol 22 (5) ◽  
pp. 48-59 ◽  
Author(s):  
Choloong Hahn ◽  
Elham Karami Keshmarzi ◽  
Seok Ho Song ◽  
Cha Hwan Oh ◽  
R. Niall Tait ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Bragg Gratings ◽  
Time Symmetry

Observation of robust statistical parity-time symmetry breaking in ultra-long cavities

2016 ◽  
Author(s):  
Ali K. Jahromi ◽  
Absar U. Hassan ◽  
Demetrois N. Christodoulides ◽  
Ayman Abouraddy
Keyword(s):  
Symmetry Breaking ◽  
Time Symmetry
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