INVESTIGADORES
CORMICK Maria Cecilia
artículos
Título:
Quantum quenches of ion Coulomb crystals across structural instabilities
Autor/es:
JENS BALTRUSCH; CECILIA CORMICK; GIOVANNA MORIGI
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2012 vol. 86 p. 1 - 13
ISSN:
1050-2947
Resumen:
Quenches in an ion chain can create
coherent superpositions of motional states across the linear-zigzag
structural transition. The procedure has been described in Baltrusch et al. [ Phys. Rev. A 84 063821 (2011)]
and makes use of spin-dependent forces, so that a coherent
superposition of the electronic states of one ion evolves into an
entangled state between the chain's internal and external degrees of
freedom. The properties of the crystalline state so generated are
theoretically studied by means of Ramsey interferometry on one ion of
the chain. An analytical expression for the visibility of the
interferometric measurement is obtained for a chain of an arbitrary
number of ions and as a function of the time elapsed after the quench.
Sufficiently close to the linear-zigzag instability the visibility
decays very fast, but exhibits revivals at the period of oscillation of
the mode that drives the structural instability. These revivals have a
periodicity that is independent of the crystal size, and they signal the
creation of entanglement by the quantum quench.