High fidelity state preparation and measurement of ion hyperfine qubits with I > 1/2

Abstract

We present a method for achieving high fidelity state preparation and measurement (SPAM) using trapped ion hyperfine qubits with nuclear spins higher than $I=1/2$. The ground states of these higher nuclear spin isotopes do not afford a simple frequency-selective state preparation scheme. We circumvent this limitation by stroboscopically driving strong and weak transitions, blending fast optical pumping using dipole transitions and narrow microwave or optical quadrupole transitions. We demonstrate this method with the $I=3/2$ isotope $^{137}\mbox{Ba}^+$ to achieve a SPAM infidelity of $\left(9.0\pm 1.3\right)\times 10^{-5}$ ($-40.5\pm 0.6$ dB), facilitating the use of a wider range of ion isotopes with favorable wavelengths and masses for quantum computation.

5 pages, 4 figures

References in corpus (6)

• High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit
• Manipulation and Detection of a Trapped Yb+ Ion Hyperfine Qubit
• Extending Quantum Coherence in Diamond
• Experimental quantum information processing with 43Ca+ ions
• Precision measurement of the lifetime of the 6p 2P_1/2 level of Yb+
• Engineering atomic polarization with microwave-assisted optical pumping

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