Abstract
In this chapter we give an overview of how one can use a calcium ion as a qubit. We then review the operation of a Paul trap, and discuss the quantised behaviour of a ‘crystal’ of trapped ions near their motional ground state. The shared motional degrees of freedom of such a crystal allow the implementation of quantum ‘logic gates’, i.e. multi-qubit entangling operations.
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Notes
- 1.
The clock qubit is first order insensitive to magnetic field variation at zero magnetic field, but we need to apply a quantisation field of \({\sim }\,2\)G in order to read out and prepare the qubit efficiently, giving rise to a small first-order dependence.
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Ballance, C.J. (2017). Trapped-Ion Qubits. In: High-Fidelity Quantum Logic in Ca+. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-68216-7_2
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DOI: https://doi.org/10.1007/978-3-319-68216-7_2
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