Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/32482
Title: Generation and control of quantum entanglement in physical systems
Authors: DAI LI
Keywords: Quantum entanglement, spin chain, beam splitter, multi-particle interferometer, coupled cavities, thermalization
Issue Date: 16-Jul-2011
Source: DAI LI (2011-07-16). Generation and control of quantum entanglement in physical systems. ScholarBank@NUS Repository.
Abstract: This thesis will discuss four topics in the field of generation and control of quantum entanglement in physical systems. The first topic discusses the maximal entanglement generation in a spin chain of XX model with specially engineered couplings. A universal solution is found for an odd-numbered spin chain by introducing asymmetry in the optimal perfect-state-transfer solution. The introduction of asymmetric couplings is analogous to an insertion of a beam splitter. The second topic discusses the realization of the multiparticle Hanbury Brown-Twiss interferometer in a spin network. For an N-particle system, the interference effect is manifested only in the normal ordered Nth-order intensity correlation function. This effect is enhanced through a post-selection process in which the multipartite Greenberger-Horne-Zeilinger entanglement is generated. An experimental realization through Nitrogen-Vacancy color centers in diamond crystals is proposed. The third topic studies the coherent control of the steady-state entanglement in lossy and driven coupled atom-cavity systems. It is found that the steady-state entanglement can be coherently controlled through the tuning of the phase difference between the driving fields. The controlling process is reminiscent of the coherent trapping of the three-level atoms using two classical coherent fields. The fourth topic studies the thermalization of a single atom-cavity system by examining the relation between the steady state and a thermal equilibrium state of the system when the parameters such as the reservoir temperature and the driving strength are varied. It is found that quantum discord appears to be a suitable quantity to characterize the degree of thermalization.
URI: http://scholarbank.nus.edu.sg/handle/10635/32482
Appears in Collections:Ph.D Theses (Open)

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