"Quantum Error Correction for Metrology":
Due to the particular experimental relevance, the effects of environmental noise in quantum metrology has been studied intensely in recent years. Fundamental bounds for parameter estimation of noisy channels have been derived, and experimental techniques have been developed to counter the compromising effects noise, such as dynamical decoupling.
In this talk, I will introduce an alternative, error-correction-based approach to improve quantum sensing protocols in the presence of noise.
Guided by several simple examples in the context of nanoscale sensing using nitrogen-vacancy centers in diamond, I derive a set of conditions under which it is possible to correct errors arising from the coupling to the environment without perturbing the signal of the quantum measurement. The scheme is complementary to current dynamical decoupling techniques, and can improve sensing under realistic experimental conditions by several orders of magnitude. The perspective of Heisenberg-limited sensitivity in the presence of noise will be briefly discussed.