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Quantum Brownian motion with inhomogeneous damping and diffusion
dc.contributor.author | Massignan, Pietro |
dc.contributor.author | Lampo, Aniello |
dc.contributor.author | Wehr, Jan |
dc.contributor.author | Lewenstein, Maciej |
dc.contributor.other | Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques |
dc.date.accessioned | 2015-03-30T13:47:09Z |
dc.date.available | 2015-03-30T13:47:09Z |
dc.date.issued | 2015-03-23 |
dc.identifier.citation | Massignan, Pietro [et al.]. Quantum Brownian motion with inhomogeneous damping and diffusion. "Physical Review A: Atomic, Molecular, and Optical Physics", 23 Març 2015, vol. 91, núm. 033627. |
dc.identifier.issn | 1050-2947 |
dc.identifier.uri | http://hdl.handle.net/2117/27114 |
dc.description.abstract | We analyze the microscopic model of quantum Brownian motion, describing a Brownian particle interacting with a bosonic bath through a coupling which is linear in the creation and annihilation operators of the bath, but may be a nonlinear function of the position of the particle. Physically, this corresponds to a configuration in which damping and diffusion are spatially inhomogeneous. We derive systematically the quantum master equation for the Brownian particle in the Born-Markov approximation and we discuss the appearance of additional terms, for various polynomials forms of the coupling. We discuss the cases of linear and quadratic coupling in great detail and we derive, using Wigner function techniques, the stationary solutions of the master equation for a Brownian particle in a harmonic trapping potential. We predict quite generally Gaussian stationary states, and we compute the aspect ratio and the spread of the distributions. In particular, we find that these solutions may be squeezed (superlocalized) with respect to the position of the Brownian particle. We analyze various restrictions to the validity of our theory posed by non-Markovian effects and by the Heisenberg principle. We further study the dynamical stability of the system, by applying a Gaussian approximation to the time-dependent Wigner function, and we compute the decoherence rates of coherent quantum superpositions in position space. Finally, we propose a possible experimental realization of the physics discussed here, by considering an impurity particle embedded in a degenerate quantum gas. |
dc.format.extent | 20 |
dc.language.iso | eng |
dc.publisher | APS Physics |
dc.subject | Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica |
dc.subject.lcsh | Brownian motion processes |
dc.subject.other | Brownian motion |
dc.title | Quantum Brownian motion with inhomogeneous damping and diffusion |
dc.type | Article |
dc.subject.lemac | Quàntums, Teoria dels |
dc.relation.publisherversion | http://journals.aps.org/pra/pdf/10.1103/PhysRevA.91.033627 |
dc.rights.access | Open Access |
dc.description.version | Postprint (published version) |
local.citation.author | Massignan, Pietro; Lampo, Aniello; Wehr, Jan; Lewenstein, Maciej |
local.citation.publicationName | Physical Review A: Atomic, Molecular, and Optical Physics |
local.citation.volume | 91 |
local.citation.number | 033627 |
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