Zobrazeno 1 - 10
of 500
pro vyhledávání: '"Morandi, G."'
Bargmann invariants and null phase curves are known to be important ingredients in understanding the essential nature of the geometric phase in quantum mechanics. Null phase manifolds in quantum-mechanical ray spaces are submanifolds made up entirely
Externí odkaz:
http://arxiv.org/abs/1302.0206
Autor:
Ivan, J. Solomon, Chaturvedi, S., Ercolessi, E., Marmo, G., Morandi, G., Mukunda, N., Simon, R.
Nonclassicality in the sense of quantum optics is a prerequisite for entanglement in multi-mode radiation states. In this work we bring out the possibilities of passing from the former to the latter, via action of classicality preserving systems like
Externí odkaz:
http://arxiv.org/abs/1009.6104
We review here some conventional as well as less conventional aspects of the time-independent and time-dependent Hamilton-Jacobi (HJ) theory and of its connections with Quantum Mechanics. Less conventional aspects involve the HJ theory on the tangent
Externí odkaz:
http://arxiv.org/abs/0907.0964
Publikováno v:
J. Phys. A: Math. Theor. 42 (2009) 055002
We derive the dominant contribution to the large-distance decay of correlation functions for a spin chain model that exhibits both Haldane and Neel phases in its ground state phase diagram. The analytic results are obtained by means of an approximate
Externí odkaz:
http://arxiv.org/abs/0806.1904
Publikováno v:
Int.J.Mod.Phys.A22:3039-3064,2007
The possibility of deforming the (associative or Lie) product to obtain alternative descriptions for a given classical or quantum system has been considered in many papers. Here we discuss the possibility of obtaining some novel alternative descripti
Externí odkaz:
http://arxiv.org/abs/0706.1619
Publikováno v:
Pramana69:317-328,2007
We present a simple derivation of the matrix Riccati equations governing the reduced dynamics as one descends from the group U(N) describing the Schroedinger evolution of an N-level quantum system to the various coset spaces, Grassmanian manifolds, a
Externí odkaz:
http://arxiv.org/abs/0706.0964
Autor:
Venuti, L. Campos, Boschi, C. Degli Esposti, Ercolessi, E., Morandi, G., Ortolani, F., Pasini, S., Roncaglia, M.
Publikováno v:
Eur.Phys.J. B53 (2006) 11
Motivated by field-theoretic predictions we investigate the stable excitations that exist in two characteristic gapped phases of a spin-1 model with Ising-like and single-ion anisotropies. The sine-Gordon theory indicates a region close to the phase
Externí odkaz:
http://arxiv.org/abs/cond-mat/0605729
We discuss how the existence of a regular Lagrangian description on the tangent bundle $TQ$ of some configuration space $Q$ allows for the construction of a linear structure on $TQ$ that can be considered as "adapted" to the given dynamical system. T
Externí odkaz:
http://arxiv.org/abs/math-ph/0602011
Publikováno v:
Phys. Rev. A 73, 010303(R) (2006)
We discuss on general grounds some local indicators of entanglement, that have been proposed recently for the study and classification of quantum phase transitions. In particular, we focus on the capability of entanglement in detecting quantum critic
Externí odkaz:
http://arxiv.org/abs/quant-ph/0508236
Publikováno v:
Pramana 65 (2005) 981-993
We discuss questions pertaining to the definition of `momentum', `momentum space', `phase space', and `Wigner distributions'; for finite dimensional quantum systems. For such systems, where traditional concepts of `momenta' established for continuum
Externí odkaz:
http://arxiv.org/abs/quant-ph/0507094