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The field of quantum sensing explores the use of quantum phenomena to measurea broad range of physical quantities, of both static and time-dependent types.An important figure of merit for sensing time dependent signals is the spectralresolution, i.e. the ability to resolve two different frequencies. Here westudy this problem, and develop new superresolution methods that rely onquantum features. We first formulate a general criterion for superresolution inquantum problems. Inspired by this, we show that quantum detectors can resolvetwo frequencies from incoherent segments of the signal, irrespective of theirseparation, in contrast to what is known about classical detection schemes. Themain idea behind these methods is to overcome the vanishing distinguishabilityin resolution problems by nullifying the projection noise.

Overcoming resolution limits with quantum sensing