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Robust quantum metrology with explicit symmetric states


Quantum metrology is a promising practical use case for quantum technologies, where physical quantities can be measured with unprecedented precision. In lieu of quantum error correction procedures, near term quantum devices are expected to be noisy, and we have to make do with noisy probe states. With carefully chosen symmetric probe states inspired by the quantum error correction capabilities of certain symmetric codes, we prove that quantum metrology can exhibit an advantage over classical metrology, even after the probe states are corrupted by a constant number of erasure and dephasing errors. These probe states prove useful for robust metrology not only in the NISQ regime, but also in the asymptotic setting where they achieve Heisenberg scaling. This brings us closer towards making robust quantum metrology a technological reality.

Dates and versions

hal-02383724 , version 1 (27-11-2019)



Yingkai Ouyang, Nathan Shettell, Damian Markham. Robust quantum metrology with explicit symmetric states. 2019. ⟨hal-02383724⟩
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