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Q: Fachverband Quantenoptik und Photonik

Q 8: Quantum Effects: Interference and Correlations II / Entanglement and Decoherence I

Q 8.5: Vortrag

Montag, 8. März 2010, 17:45–18:00, A 310

Ramsey Interferometry of Ion Coulomb Crystals in Spin-Dependent Potentials — •Jens Domagoj Baltrusch^1,2, Gabriele De Chiara², Tommaso Calarco³, Shmuel Fishman⁴, and Giovanna Morigi¹ — ¹Theoretische Physik, Universität des Saarlandes, Germany — ²Grup d'Òptica, Universitat Autònoma de Barcelona, Spain — ³Institut für Quanteninformationsverarbeitung, Universität Ulm, Germany — ⁴Department of Physics, Technion, Haifa, Israel

Ions confined in a harmonic, but highly anisotropic potential crystallize in a linear chain at sufficient low temperatures. By lowering the ratio between the radial and axial trapping frequency below a critical value, the system passes through a second order phase transition from a linear to a zig-zag configuration. By coupling the internal and the motional degrees of freedom, it is possible to measure the statistical properties of the crystal via a Ramsey type of experiment. One example is given by the autocorrelation function of the crystal which is connected to the visibility of the Ramsey signal [G. De Chiara et al. PRA 78, 043414 (2008)]. We present prospects to extend this model for ion crystals subjected to spin-dependent potentials.