Two-level ionic systems, where quantum information is encoded in long-lived states (quantum bits, qubits), are discussed extensively for quantum information processing. We present a collection of measurements which characterize the stability of a qubit based on the S 1/2 – D 5/2 transition of single 40 Ca + ions in a linear Paul trap. We find coherence times of ≃ 1 ms, discuss the main technical limitations and outline possible improvements.
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Schmidt–Kaler et al. (2003) studied this question.
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