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Geometry of Quantum States (Hardcover)(419)

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Prefacep. ix
Convexity, colours and statisticsp. 1
Convex setsp. 1
High-dimensional geometryp. 8
Colour theoryp. 13
What is 'distance'?p. 17
Probability and statisticsp. 24
Geometry of probability distributionsp. 28
Majorization and partial orderp. 28
Shannon entropyp. 35
Relative entropyp. 40
Continuous distributions and measuresp. 45
Statistical geometry and the Fisher-Rao metricp. 47
Classical ensemblesp. 53
Generalized entropiesp. 55
Much ado about spheresp. 62
Spheresp. 62
Parallel transport and statistical geometryp. 67
Complex, Hermitian and Kahler manifoldsp. 73
Symplectic manifoldsp. 79
The Hopf fibration of the 3-spherep. 81
Fibre bundles and their connectionsp. 87
The 3-sphere as a groupp. 93
Cosets and all thatp. 98
Complex projective spacesp. 102
From art to mathematicsp. 102
Complex projective geometryp. 106
Complex curves, quadrics and the Segre embeddingp. 109
Stars, spinors and complex curvesp. 112
The Fubini-Study metricp. 114
CP[superscript n] illustratedp. 120
Symplectic geometry and the Fubini-Study measurep. 127
Fibre bundle aspectsp. 128
Grassmannians and flag manifoldsp. 131
Outline of quantum mechanicsp. 135
Quantum mechanicsp. 135
Qubits and Bloch spheresp. 137
The statistical and the Fubini-Study distancesp. 140
A real look at quantum dynamicsp. 143
Time reversalsp. 147
Classical and quantum states: a unified approachp. 151
Coherent states and group actionsp. 156
Canonical coherent statesp. 156
Quasi-probability distributions on the planep. 161
Bloch coherent statesp. 169
From complex curves to SU (K) coherent statesp. 174
SU (3) coherent statesp. 177
The stellar representationp. 182
The stellar representation in quantum mechanicsp. 182
Orbits and coherent statesp. 184
The Husimi functionp. 187
Wehrl entropy and the Lieb conjecturep. 192
Generalized Wehrl entropiesp. 195
Random pure statesp. 197
From the transport problem to the Monge distancep. 203
The space of density matricesp. 209
Hilbert-Schmidt space and positive operatorsp. 209
The set of mixed statesp. 213
Unitary transformationsp. 216
The space of density matrices as a convex setp. 219
Stratificationp. 224
An algebraic afterthoughtp. 229
Summaryp. 231
Purification of mixed quantum statesp. 233
Tensor products and state reductionp. 234
The Schmidt decompositionp. 236
State purification and the Hilbert-Schmidt bundlep. 239
A first look at the Bures metricp. 242
Bures geometry for N = 2p. 245
Further properties of the Bures metricp. 247
Quantum operationsp. 251
Measurements and POVMsp. 251
Positive and completely positive mapsp. 262
Environmental representationsp. 268
Some spectral propertiesp. 270
Unital and bistochastic mapsp. 272
One qubit mapsp. 275
Duality: maps versus statesp. 281
Positive and decomposable mapsp. 281
Dual cones and super-positive mapsp. 288
Jamiolkowski isomorphismp. 290
Quantum maps and quantum statesp. 292
Density matrices and entropiesp. 297
Ordering operatorsp. 297
Von Neumann entropyp. 301
Quantum relative entropyp. 307
Other entropiesp. 311
Majorization of density matricesp. 313
Entropy dynamicsp. 318
Distinguishability measuresp. 323
Classical distinguishability measuresp. 323
Quantum distinguishability measuresp. 328
Fidelity and statistical distancep. 333
Monotone metrics and measuresp. 339
Monotone metricsp. 339
Product measures and flag manifoldsp. 344
Hilbert-Schmidt measurep. 347
Bures measurep. 350
Induced measuresp. 351
Random density matricesp. 354
Random operationsp. 358
Quantum entanglementp. 363
Introducing entanglementp. 363
Two qubit pure states: entanglement illustratedp. 367
Pure states of a bipartite systemp. 371
Mixed states and separabilityp. 380
Geometry of the set of separable statesp. 389
Entanglement measuresp. 394
Two-qubit mixed statesp. 404
Epiloguep. 415
Basic notions of differential geometryp. 417
Differential formsp. 417
Riemannian curvaturep. 418
A key fact about mappingsp. 419
Basic notions of group theoryp. 421
Lie groups and Lie algebrasp. 421
SU(2)p. 422
SU(N)p. 422
Homomorphisms between low-dimensional groupsp. 423
Geometry: do it yourselfp. 424
Hints and answers to the exercisesp. 428
Referencesp. 437
Indexp. 462
Table of Contents provided by Ingram. All Rights Reserved.

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Quantum information theory is at the frontiers of physics, mathematics and information science, offering a variety of solutions that are impossible using classical theory. This book provides an introduction to the key concepts used in processing quantum information and reveals that quantum mechanics is a generalisation of classical probability theory. After a gentle introduction to the necessary mathematics the authors describe the geometry of quantum state spaces. Focusing on finite dimensional Hilbert spaces, they discuss the statistical distance measures and entropies used in quantum theory. The final part of the book is devoted to quantum entanglement - a non-intuitive phenomenon discovered by Schrdinger, which has become a key resource for quantum computation. This richly-illustrated book is useful to a broad audience of graduates and researchers interested in quantum information theory. Exercises follow each chapter, with hints and answers supplied.

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