118 research outputs found
Quantum Phase Transitions in a Linear Ion Trap
We show that the quantum phase transition of the Tavis-Cummings model can be
realised in a linear ion trap of the kind proposed for quantum computation. The
Tavis-Cummings model describes the interaction between a bosonic degree of
freedom and a collective spin. In an ion trap, the collective spin system is a
symmetrised state of the internal electronic states of N ions, while the
bosonic system is the vibrational degree of freedom of the centre of mass mode
for the ions.Comment: 6 pages and 2 figures. submitted to Dan Walls Memorial Volume, edited
by H. Carmichael, R. Glauber, and M. Scully, to be published by Springe
Observer dependent entanglement
Understanding the observer-dependent nature of quantum entanglement has been
a central question in relativistic quantum information. In this paper we will
review key results on relativistic entanglement in flat and curved spacetime
and discuss recent work which shows that motion and gravity have observable
effects on entanglement between localized systems.Comment: Ivette Fuentes previously published as Ivette Fuentes-Guridi and
Ivette Fuentes-Schulle
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