High-fidelity state detection and tomography of a single-ion Zeeman qubit

A. Keselman*, Y. Glickman, N. Akerman, S. Kotler, R. Ozeri

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


We demonstrate high-fidelity Zeeman qubit state detection in a single trapped 88Sr+ ion. Qubit readout is performed by shelving one of the qubit states to a metastable level using a narrow linewidth diode laser at 674 nm, followed by state-selective fluorescence detection. The average fidelity reached for the readout of the qubit state is 0.9989(1). We then measure the fidelity of state tomography, averaged over all possible single-qubit states, which is 0.9979(2). We also fully characterize the detection process using quantum process tomography. This readout fidelity is compatible with recent estimates of the detection error threshold required for fault-tolerant computation, whereas high-fidelity state tomography opens the way for high-precision quantum process tomography.

Original languageAmerican English
Article number073027
JournalNew Journal of Physics
StatePublished - Jul 2011
Externally publishedYes


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