Saturable global quantum sensing

Understand

Conventional formulation of quantum sensing has been mostly developed in the context of local estimation, where the unknown parameter is roughly known.

• In contrast, global sensing, where the prior information is incomplete and the unknown parameter is only known to lie within a broad interval, is practically more engaging but has received far less theoretical attention.
• Available formulations of global sensing rely on adaptive Bayesian strategies requiring on-the-fly change in measurement settings, or minimizing average uncertainty yielding unsaturable bounds.
• Here, we provide an operationally motivated approach to global sensing for fixed but optimized settings.