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007			cr nn 008mamaa
008			110517s2011 gw | s |||| 0|eng d
020			_a9783642193422 _9978-3-642-19342-2
040			_cMX-MeUAM
050		4	_aQC173.96-174.52
082	0	4	_a530.12 _223
100	1		_aWichterich, Hannu Christian. _eauthor.
245	1	0	_aEntanglement Between Noncomplementary Parts of Many-Body Systems _h[recurso electrónico] / _cby Hannu Christian Wichterich.
264		1	_aBerlin, Heidelberg : _bSpringer Berlin Heidelberg, _c2011.
300			_aXII, 116 p. _bonline resource.
336			_atext _btxt _2rdacontent
337			_acomputer _bc _2rdamedia
338			_aonline resource _bcr _2rdacarrier
347			_atext file _bPDF _2rda
490	1		_aSpringer Theses ; _v1
505	0		_aIntroduction -- Exploiting Quench Dynamics in Spin Chains for Distant Entanglement and Quantum Communication -- Extraction of Pure Entangled States from Many-Body Systems by Distant Local Projections -- Scaling of Negativity of Separating Blocks in Spin Chains and Critically.-Universality of the Negativity in the Lipkin-Mechkov-Glick Model -- Conclusions and Outlook -- A. Diagonalisation of the XX Model -- B. Factorisation of the Fermionic Correlation Functions -- C. Time Dependence of the Reduced Density Operator Following Quench -- D. Density Matrix Renormalisation Group Algorithm -- E. Proof of Williamson’s Theorem -- F. Partial Transposition in Continuous Variable Systems -- G. Gaussian Wigner Representation of Bosonic Vacuum -- H. Ground State Covariance Matrix of a Quadtratic Hamiltonean -- I. Bipartitie Entanglement of Gaussian States -- J. Density Matrix Spectra of Bosonic Gaussian States -- K. Bosonisation of the LMG Hamiltonian -- Bibliography.
520			_aThis thesis investigates the structure and behaviour of entanglement, the purely quantum mechanical part of correlations, in many-body systems, employing both numerical and analytical techniques at the interface of condensed matter theory and quantum information theory. Entanglement can be seen as a precious resource which, for example, enables the noiseless and instant transmission of quantum information, provided the communicating parties share a sufficient "amount" of it. Furthermore, measures of entanglement of a quantum mechanical state are perceived as useful probes of collective properties of many-body systems. For instance, certain measures are capable of detecting and classifying ground-state phases and, particularly, transition (or critical) points separating such phases. Chapters 2 and 3 focus on entanglement in many-body systems and its use as a potential resource for communication protocols. They address the questions of how a substantial amount of entanglement can be established between distant subsystems, and how efficiently this entanglement could be "harvested" by way of measurements. The subsequent chapters 4 and 5 are devoted to universality of entanglement between large collections of particles undergoing a quantum phase transition, where, despite the enormous complexity of these systems, collective properties including entanglement no longer depend crucially on the microscopic details.
650		0	_aPhysics.
650		0	_aQuantum theory.
650	1	4	_aPhysics.
650	2	4	_aQuantum Physics.
650	2	4	_aStrongly Correlated Systems, Superconductivity.
650	2	4	_aPhase Transitions and Multiphase Systems.
710	2		_aSpringerLink (Online service)
773	0		_tSpringer eBooks
776	0	8	_iPrinted edition: _z9783642193415
830		0	_aSpringer Theses ; _v1
856	4	0	_zLibro electrónico _uhttp://148.231.10.114:2048/login?url=http://link.springer.com/book/10.1007/978-3-642-19342-2
596			_a19
942			_cLIBRO_ELEC
999			_c203699 _d203699