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Quantum entanglement in a many-body system exhibiting multiple quantum phase transitions
Quantum phase transitions Many body systems
2010/7/5
We investigate the quantum entanglement-related features of the many-body model of Plastino and Moszkowski [N. Cimento 47 (1978) 470]. This is an exactly solvable N-body, SU2 two-level model exhibitin...
New Phase Transitions in Optimal States for Memory Channels
New Phase Transitions Optimal States Memory Channels
2010/4/8
We investigate the question of optimal input ensembles for memory channels and construct a rather large class of Pauli channels with correlated noise which can be studied analytically with regard to t...
Fluctuations, Classical Activation, Quantum Tunneling, and Phase Transitions
Classical Activation Quantum Tunneling Phase Transitions
2010/10/13
We study two broad classes of physically dissimilar problems, each corresponding to stochastically driven escape from a potential well. The first class, often used to model noise-induced order paramet...