caa a22 4500 445858664 CHVBK 20180317145436.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10946-011-9221-3 doi (NATIONALLICENCE)springer-10.1007/s10946-011-9221-3 Quantum entanglement and squeezing in coupled harmonic and anharmonic oscillator systems [Elektronische Daten] [Lock Chew, Ning Chung] We investigate the fundamental connection between quadrature squeezing and continuous variable entanglement within a general class of two-coupled oscillator systems. We determine the quantitative relationship between them through the squeezing parameter and the entanglement entropy of the lowest energy eigenstate of the coupled oscillator systems numerically. Unlike the relation between entanglement and uncertainty product, we found that this relationship is, by no means, the same for the whole class of coupled oscillator systems: to a large extent it depends on the order and strength of the anharmonic potential, which implies that knowledge of the anharmonic potential of the coupled oscillator system is required before one can characterize the degree of entanglement through the squeezing parameter. Our results reveal that a more effective approach to enhance squeezing is to adjust the anharmonicity of the system potential, instead of increasing the quantum correlations between the oscillators. In addition, by probing into a quantum catastrophe model, we uncover transitions in the entanglement entropy and squeezing relation as the potential changes from a single well to a triple well, and then a double-well structure. The transitions appear through distinct entropy-squeezing relation, with a multi-well structure displaying a larger change in the antisqueezing behavior of the position quadrature than the single-well structure, for the same change in the entanglement entropy. Springer Science+Business Media, Inc., 2011 coupled oscillator systems nationallicence quantum squeezing nationallicence quantum entanglement nationallicence quantum catastrophe nationallicence Chew Lock Nanyang Technological University, 21 Nanyang Link, SPMS-PAP-04-04, 637371, Singapore, Singapore aut Chung Ning Temasek Laboratories, National University of Singapore, 117508, Singapore, Singapore aut Journal of Russian Laser Research Springer US; http://www.springer-ny.com 32/4(2011-07-01), 331-337 1071-2836 32:4<331 2011 32 10946 https://doi.org/10.1007/s10946-011-9221-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10946-011-9221-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chew Lock Nanyang Technological University, 21 Nanyang Link, SPMS-PAP-04-04, 637371, Singapore, Singapore aut NATIONALLICENCE 700 1- Chung Ning Temasek Laboratories, National University of Singapore, 117508, Singapore, Singapore aut NATIONALLICENCE 773 0- Journal of Russian Laser Research Springer US; http://www.springer-ny.com 32/4(2011-07-01), 331-337 1071-2836 32:4<331 2011 32 10946 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer