Abstract

In order to implement conditional quantum dynamics of qubits represented by the internal structure of individual ions in a linear Paul trap, a vibrational mode of the entire ion string is used. A proposal of representing conditional dynamics requires the ions to be cooled to their vibrational ground state, whereas a recently proposed less restrictive scheme still demands low vibrational quantum numbers n (i.e. η²(n + 1) ≪1, where η is the Lamb-Dicke parameter) [1]. Thus, laser cooling is most essential for the implementation of quantum information processing in ion traps, and it is desirable to have robust cooling techniques at hand that arc suited to reach small n-values at moderate technological expenditure on the side of the laser sources.

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