Abstract

We demonstrate an optical single qubit based on a narrow 6S1/2 to 5D5/2 quadrupole transition of a single Ba+ ion operated by only diode-based lasers. The characteristic properties of the qubit are discussed. We observe continuous bit-flip oscillations at a rate of about 250 kHz, which is fast enough for a qubit operation as compared to the measured coherence time of over 3 ms. We also present a technique, called randomized benchmarking, to quantify the bit-flip error in each qubit NOT gate operation.

© 2017 Optical Society of America

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