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Preparation and detection of a 137Ba+ hyperfine qubit

Matt Dietrich, University of Washington

(Session 6 : Saturday from 11:00-11:30)

Abstract. We report the initialization and state detection of 137Ba+ hyperfine qubits. We load 137Ba+ into a linear Paul trap by direct photoionization with a Xe discharge lamp. The qubit is initialized by optically pumping into the magnetic field insensitive hyperfine ground state (F=2 m_f=0). State selective shelving to the metastable D5/2 state is accomplished by adiabatic rapid passage using a 1762 nm fiber laser stabilized to a high-finesse cavity, a process which is used for high efficiency state detection. Single qubit rotations are accomplished by RF pulses at the hyperfine splitting (8.037 GHz). Rabi flops excited by individual ultrafast laser pulses have been demonstrated and future plans include using these pulses to generate controlled-phase gates between two ions on sub-microsecond time scale.