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- W2276974166 abstract "This thesis is concerned with the development of an intermediate magnetic field clock-qubit in 43 Ca + at 146G and techniques to manipulate this qubit using microwaves and lasers. While 43 Ca + has previously been used as a qubit, its relatively complicated level structure - with a nuclear spin of 7/2 and low-lying D-states -- makes cooling it in the intermediate field an intimidating prospect. As a result, previous experiments have used small magnetic fields of a few gauss where coherence times are limited and off-resonant excitation is a significant source of experimental error. We demonstrate a simple scheme that allows 43 Ca + to be cooled in the intermediate field without any additional experimental complexity compared with low fields. Using the clock-qubit, we achieve a coherence time of T * 2 = 50 (10)s - the longest demonstrated in any single qubit. We also demonstrate a combined state preparation and measurement error of 6.8(6)x 10 -4 - the lowest achieved for a hyperfine trapped ion qubit [NVG + 13] - and single-qubit logic gates with average errors of 1.0(3) x 10 -6 - more than an order of magnitude better than the previous record [BWC + 11]. These results represent the state-of-the-art in the field of single-qubit control. Moreover, we achieve them all in a single scalable room-temperature ion trap using experimentally robust techniques and without relying on the use of narrow-linewidth lasers, magnetic field screening or dynamical decoupling techniques. We also present work on a recent scheme [OWC + 11] to drive two-qubit gates using microwaves. We have constructed an ion trap with integrated microwave circuitry to perform these gates. Using this trap, we have driven motional sideband transitions, demonstrating the spin-motion coupling that underlies the two-qubit gate. We present an analysis of likely sources of experimental error during a future two-qubit gate and the design and preliminary characterisation of apparatus to minimise the main error contributions. Using this apparatus, we hope to perform a two-qubit gate in the near future." @default.
- W2276974166 created "2016-06-24" @default.
- W2276974166 creator A5028266479 @default.
- W2276974166 date "2013-01-01" @default.
- W2276974166 modified "2023-09-27" @default.
- W2276974166 title "High-fidelity microwave-driven quantum logic in intermediate-field 43Ca+" @default.
- W2276974166 hasPublicationYear "2013" @default.
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