Coherence of qubits based on single Ca${}^{+}$ ions

Abstract

Two-level ionic systems, where quantum information is encoded in long lived states (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 $\simeq$1 ms, discuss the main technical limitations and outline possible improvements.

Proceedings of "Trapped charged particles and fundamental interactions" submitted to Journal of Physics B (IoP)

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