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Generalized measurements may allow the control of its back-action on thequantum system by interpolating from a very weak to strong projective action.Such a measurement can fuel a quantum heat engine or extract work depending onthe system-meter interaction. Here, we performed a proof-of-concept experimentusing nuclear magnetic resonance techniques to investigate a spin quantum heatengine driven by non-selective generalized (weak) measurements without feedbackcontrol. Our prototype of a quantum thermal device operates with a measurementprotocol and a single heat bath. The protocol is composed of two non-selectivemeasurement channels with variable measurement strengths, one dedicated tofueling the device (analogous to a hot heat source) and the other committed towork extraction. The experimental results highlight that this kind of quantumthermal device can reach unit efficiency with maximum extracted power byfine-tuning of the measurement strengths.

Experimental investigation of a quantum heat engine powered by generalized measurements