Selective control of the symmetric Dicke subspace in trapped ions

Two-photon spectroscopy of trapped HD+ ions in the Lamb-Dicke regime

Simulation of the Jahn–Teller–Dicke magnetic structural phase transition with trapped ions

We study theoretically the collective E⊗e Jahn–Teller–Dicke distortion in a system of trapped ions. In a previous work (Porras et al 2012 Phys. Rev. Lett. 108 235701) we have focused on cooperative Jahn–Teller models consisting of an ensemble of effective spins coupled to a set of many vibrational modes. Here, we show that under suitable conditions the spin ensemble may interact only with a sin...

Laser Cooling of two trapped ions: Sideband cooling beyond the Lamb–Dicke limit

We study laser cooling of two ions that are trapped in a harmonic potential and interact by Coulomb repulsion. Sideband cooling in the Lamb–Dicke regime is shown to work analogously to sideband cooling of a single ion. Outside the Lamb–Dicke regime, the incommensurable frequencies of the two vibrational modes result in a quasi-continuous energy spectrum that significantly alters the cooling dyn...

Optimal control of trapped ions – experiment

Ions that are trapped with electric and magnetic fields and manipulated with laser beams are one of the most promising systems to implement quantum algorithms, quantum simulations or also to perform high precision metrology. An important requisite for all such tasks is the cooling of the motion of the stored ions close to their quantum mechanical ground state, combined with extremely high accur...

Selective interactions in trapped ions: state reconstruction and quantum logic

We propose the implementation of selective interactions of atom-motion subspaces in trapped ions. These interactions yield resonant exchange of population inside a selected subspace, leaving the others in a highly dispersive regime. Selectivity allows us to generate motional Fock (and other nonclassical) states with high purity out of a wide class of initial states, and becomes an unconventiona...