Abstract
We propose a quantum-enhanced iterative (with steps) measurement scheme based on an ensemble of two-level probes which asymptotically approaches the Heisenberg limit , where is the number of quantum resources. The protocol is inspired by Kitaev's phase estimation algorithm and involves only collective manipulation and measurement of the ensemble. The iterative procedure takes the shot-noise-limited primary measurement with precision to increasingly precise results, . We propose an implementation of the algorithm for the measurement of a magnetic field using a two-component atomic cloud of bosons.
- Received 17 April 2013
DOI:https://doi.org/10.1103/PhysRevA.89.012118
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