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ANTONINO MESSINA

Cooling of many-body systems via selective interactions

  • Autori: Grimaudo, R.; Lamata, L.; Solano, E.; Messina, A.
  • Anno di pubblicazione: 2018
  • Tipologia: Articolo in rivista (Articolo in rivista)
  • Parole Chiave: Atomic and Molecular Physics, and Optics

Abstract

We propose a model describing N spin-1/2 systems coupled through N-order homogeneous interaction terms, in the presence of local time-dependent magnetic fields. This model can be experimentally implemented with current technologies in trapped ions and superconducting circuits. By introducing a chain of unitary transformations, we succeed in exactly converting the quantum dynamics of this system into that of 2N-1 fictitious spin-1/2 dynamical problems. We bring to light the possibility of controlling the unitary evolution of the N spins generating Greenberger-Horne-Zeilinger states under specific time-dependent scenarios. Moreover, we show that by appropriately engineering the time dependence of the coupling parameters, one may choose a specific subspace in which the N-spin system dynamics takes place. This dynamical feature, which we call time-dependent selective interaction, can generate a cooling effect of all spins in the system.

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