Speaker: Danny Segal, Department of Physics, Imperial College London, UK Title: Internal-state and motional dynamics of trapped Ca+ ions Time: Tuesday, March 3, 10.15 to 11.00 Place: 1525-323 We are undertaking a programme of work aimed at demonstrating the feasibility of using ions held in Penning traps for applications in Quantum Information Processing (QIP). I will discuss two recent experiments we have conducted. (i). A number of applications of ions in Penning traps have involved shuttling ions from one trapping zone to another, separated by distances of centimetres, along the axis of the applied magnetic field. For QIP applications shuttling over small distances in a direction perpendicular to this axis is desirable but this is complicated by the presence of the v×B component of the Lorentz force. With this application in mind, we have designed, built and operated a mm-scale multiple Penning trap structure using printed circuit board. In a preliminary test of shuttling in this structure we have demonstrated the controlled movement of small clouds of ions from one trapping zone to another in ~2.5 ?s, in a direction perpendicular to the magnetic field axis. (ii). The large magnetic field of the Penning trap causes mixing of states with different values of the J quantum number. Transitions that are strictly forbidden in the absence of the magnetic field become partially allowed. Interestingly, the electron shelving technique makes the presence of rather small state admixtures remarkably easy to detect. This effect has a bearing on the fidelity of the readout process in our system. Coffee, tea and "rundstykker"(!) will be served at 10.05 Nicolai Nygaard and Peter F. Staanum ---------------------------------- Peter Frøhlich Staanum Department of Physics and Astronomy University of Aarhus Ny Munkegade 120 8000 Aarhus C Denmark Phone: (+45) 8942 3602 Fax: (+45) 8612 0740 VAT Nr.: DK16562777 EAN Nr.: 5798000419872 ----------------------------------