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Q: Fachverband Quantenoptik und Photonik

Q 63: Poster: Precision Spectroscopy of Atoms and Ions (with A)

Q 63.15: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Efficient Quantum Algorithm for Readout in Multi-Ion Clocks — •Marius Schulte — Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany

New generations of atomic clocks are planned to rely on stable optical transitions. An important criterion for good frequency standards are extremely narrow bandwiths in the considered clock ions, but this choice comes with some problems. Due to very small scattering rates and inaccessible laser frequencies the states of the clock ions can not be measured directly. The techniques of quantum logic spectroscopy and quantum logic readouts were developed to solve these difficulties by using a second ion (logic-Ion) to perform the readout of the internal states. Up to now optical frequency standards were used with just a single clock-Ion and a sigle logic-Ion. Experiments with such configurations were able to find record breaking accuracies in the frequency measurement but suffered from poor stabilities since only one Ion was used. Therefore the next step is to scale this process up by using multiple Ions. The dominant problem there is to find an efficient readout strategy that determines the internal states of the clock-Ions via the logic-Ions. On my poster i present a possible solution to this, using an efficient quantum algorithm. The number of logic ions and gates in this method scales only logarithmically with the number of clock Ions and can therefore provide a good strategy already for small Ion numbers.