High-Fidelity Adaptive Qubit Detection through Repetitive Quantum Nondemolition Measurements
- 17 September 2007
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 99 (12), 120502
- https://doi.org/10.1103/physrevlett.99.120502
Abstract
Using two trapped ion species ( and ) as primary and ancillary quantum systems, we implement qubit measurements based on the repetitive transfer of information and quantum nondemolition detection. The repetition provides a natural mechanism for an adaptive measurement strategy, which leads to exponentially lower error rates compared to using a fixed number of detection cycles. For a single qubit we demonstrate 99.94% measurement fidelity. We also demonstrate a technique for adaptively measuring multiple qubit states using a single ancilla, and apply the technique to spectroscopy of an optical clock transition.Keywords
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