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There is no fundamental limit to the precision of a classical measurement.The position of a meter's needle can be determined with an arbitrarily smalluncertainty. In the quantum realm, however, fundamental quantum fluctuationsdue to the Heisenberg principle limit the measurement precision. The simplestmeasurement procedures, involving semi-classical states of the meter, lead to afluctuation-limited imprecision at the standard quantum limit. By engineeringthe quantum state of the meter system, the measurement imprecision can bereduced down to the fundamental Heisenberg Limit (HL). Quantum-enabledmetrology techniques are thus in high demand and the focus of an intenseactivity. We report here a quantum-enabled measurement of an electric fieldbased on this approach. We cast Rydberg atoms in Schr\"odinger cat states,superpositions of atomic levels with radically different polarizabilites. Weuse a quantum interference process to perform a measurement close to the HL,reaching a single-shot sensitivity of 1.2 mV/cm for a 100 ns interaction time,corresponding to 30 $\mu$V/cm/Hz^(1/2) at our 3 kHz repetition rate. Thishighly sensitive, non-invasive space- and time-resolved field measurementextends the realm of electrometric techniques and could have importantpractical applications. Detection of individual electrons in mesoscopic devicesat a ~100 $\mu$m distance, with a MegaHertz bandwith is within reach.

A quantum-enabled Rydberg atom electrometer