scholarly journals Inhomogeneous Gutzwiller approximation with random phase fluctuations for the Hubbard model

2003 ◽  
Vol 67 (8) ◽  
Author(s):  
G. Seibold ◽  
F. Becca ◽  
J. Lorenzana
Keyword(s):  
Hubbard Model ◽  
Random Phase ◽  
Phase Fluctuations ◽  
Gutzwiller Approximation

Universal dynamical control of decay and decoherence for weak and strong system-bath coupling

2005 ◽  
Vol 5 (4&5) ◽  
pp. 285-317
Author(s):  
G. Gordon ◽  
G. Kurizki ◽  
A.G. Kofman ◽  
S. Pellegrin
Keyword(s):  
Random Phase ◽  
Quantum Systems ◽  
Unified Theory ◽  
Phase Fluctuations ◽  
Strongly Coupled ◽  
Weakly Coupled ◽  
Abrupt Changes ◽  
Dynamical Control ◽  
Strong System ◽  
The Continuum

A unified theory is given of dynamically modified decay and decoherence in driven two-level and multilevel quantum systems that are weakly coupled to arbitrary finite-temperature reservoirs and undergo random phase fluctuations. Criteria for the optimization of decoherence suppression and the limitations of this approach are obtained. For a driven qubit that is strongly coupled to the continuum edge of reservoir's spectrum, we demonstrate that only an appropriately ordered sequence of abrupt changes of the resonance frequency, near the continuum edge, can effectively protect the qubit state from decoherence.

scholarly journals Optical-Amplifier-Compatible Long-Distance Secure Key Generation Based on Random Phase Fluctuations for WDM Systems

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6296
Author(s):  
Ben Wu ◽  
Yue-Kai Huang
Keyword(s):  
Wavelength Division Multiplexing ◽  
Distribution System ◽  
Optical Amplifiers ◽  
Random Phase ◽  
Distribution Channel ◽  
Optical Amplifier ◽  
Key Generation ◽  
Secret Key ◽  
Long Distance ◽  
Phase Fluctuations

We proposed and experimentally demonstrated a secure key generation and distribution system that is compatible with optical amplifiers and standard wavelength-division multiplexing (WDM) transmission systems. The key is generated from the phase fluctuations induced by environmental instabilities. The key generation system is tested in a 240 km bidirectional fiber-pair link with multiple optical amplifiers. To demonstrate the compatibility with WDM systems, 38 WDM channels are transmitted together with the key distribution channel. The secret key is protected against eavesdropping and coherence detection attack by the wide-band property of the signal carrier and the fast-changing rate of the phase fluctuations.

scholarly journals Simple algorithm for the correction of MRI image artefacts due to random phase fluctuations

2017 ◽  
Vol 44 ◽  
pp. 55-59 ◽  
Author(s):  
Lionel M. Broche ◽  
P. James Ross ◽  
Gareth R. Davies ◽  
David J. Lurie
Keyword(s):  
Random Phase ◽  
Simple Algorithm ◽  
Phase Fluctuations ◽  
Image Artefacts ◽  
Mri Image
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