			Home About us Contact

Quantum Correlation (quantum + correlation)

Distribution by Scientific Domains

Physics and Astronomy	60%
Polymers and Materials Science	40%

Selected Abstracts

Solid acid clay mediated copolymerization of methyl acrylate and 1-octene: 2D NMR substantiation of predominant alternating comonomer sequence

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 8 2009
Sukhdeep Kaur
Abstract Montmorillionite K10 powder presence during radically initiated copolymerization of methyl acrylate (M) and 1-octene (O) gave copolymers with higher incorporation of alkene unit. Highly viscous and transparent copolymers showed alternation irrespective of the copolymer composition. Increasing the amount of K10 powder increased the total percentage conversion, as well as 1-octene incorporation. The monomodal curves obtained in gel permeation chromatography (GPC) substantiated that true copolymers were formed. The alternation in the copolymers was authenticated through Heteronuclear Multiple Quantum Correlation (HMQC) experiments in conjugation with Total Correlated Spectroscopy (TOCSY). © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 2156,2162, 2009 [source]

Kinetics of Core-Shell Nanoparticle Formation by Two-Dimensional Nuclear Magnetic Resonance

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 11 2009
Alaitz Ruiz de Luzuriaga
Abstract We have studied the kinetics of polymeric nanoparticle formation for poly(styrene- block -4-vinylpyridine) [P(S- b -4-VPy)], chains in a non-selective solvent using 1,4-dibromobutane (DBB) as a cross-linker by means of different nuclear magnetic resonance (NMR) spectroscopy techniques. The kinetic process was followed using 1H, 13C, and 2-D Heteronuclear Single Quantum Correlation (HSQC) NMR experiments. The kinetic data obtained from 2-D HSQC and 1H NMR experiments were in good agreement between them, proving the reliability of the 2-D HSQC NMR technique for the in situ study of the kinetics of core-shell nanoparticle formation. A value of 1.5,×,10,5 s,1 was determined for the apparent kinetic constant of the P(S- b -4-VPy)-DBB core-shell nanoparticle formation process. [source]

Influence of the phonon-exciton interaction on exciton-exciton quantum correlation in semiconductor microcavities

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 7 2006
S. Portolan
Abstract We present an extension of the previous descriptions based on the Dynamics Controlled Truncation Scheme of light-matter interaction beyond mean-field, including the microscopic description of the exciton-photon interaction. This enables the microscopic analysis of the influence of decoherence and noise on the polariton quantum correlations originating from nonlinear optical processes. We expand the operators involved in the dynamics in terms of exact eigenstates of the electron system, the photon and phonon operators and treat phonon-assisted transitions within the Markov approximation. In particular, we present quantum Heisenberg-Langevin equations describing light-induced excitations in semiconductor systems interacting with the phonon bath. This theoretical framework is applied to study the influence of dephasing and noise due to photoluminescence on polariton quantum correlations generated by parametric emission in microcavities. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Multiphoton entanglement and interferometry

FORTSCHRITTE DER PHYSIK/PROGRESS OF PHYSICS, Issue 4-5 2003
M. Bourennane
Multiphoton entanglement is the basis of many quantum communication schemes, quantum cryptographic protocols, and fundamental tests of quantum theory. Spontaneous parametric down-conversion is the most effective source for polarization entangled photon pairs. Here we show, that a class of entangled 4-photon states can be directly created by parametric down-conversion. These states exhibit perfect quantum correlations and a high robustness of entanglement against photon loss. Therefore these states are well suited for new types of quantum communication. [source]