Abstract
Two-level ionic systems, where quantum information is encoded in long-livedstates (quantum bits, qubits), are discussed extensively for quantuminformation processing. We present a collection of measurements whichcharacterize the stability of a qubit based on the S1/2 – D5/2 transitionof single 40Ca+ions in a linear Paul trap. We find coherence times of ≃ 1ms, discuss the main technical limitations and outline possible improvements.
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