Improved Quantum Metrology Using Quantum Error Correction
Improved Quantum Metrology Using Quantum Error Correction
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DOI：
10.1103/physrevlett.112.080801
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发表时间：
2014-02-26
影响因子：
8.6
通讯作者：
Kraus, B.
中科院分区：
文献类型：
--
作者：
Duer, W.;Skotiniotis, M.;Kraus, B.
我们考虑在噪声环境中的量子计量学，其中噪声和退相干的影响限制了量子纠缠在精度上可实现的增益。我们表明，通过使用量子纠错工具，可以克服这种限制。这在两种情况下得到了证明，包括具有单量子比特退相或去极化噪声的多体哈密顿量和具有横向噪声的单体哈密顿量。在这两种情况下，我们表明，海森堡标度，因此，二次改进的经典情况下，可以保留。此外，对于频率估计的情况下，我们发现，在某些情况下，允许包含误差校正，即使在渐近极限的有限的最佳询问时间。
We consider quantum metrology in noisy environments, where the effect of noise and decoherence limits the achievable gain in precision by quantum entanglement. We show that by using tools from quantum error correction this limitation can be overcome. This is demonstrated in two scenarios, including a many-body Hamiltonian with single-qubit dephasing or depolarizing noise and a single-body Hamiltonian with transversal noise. In both cases, we show that Heisenberg scaling, and hence a quadratic improvement over the classical case, can be retained. Moreover, for the case of frequency estimation we find that the inclusion of error correction allows, in certain instances, for a finite optimal interrogation time even in the asymptotic limit.