Coherent interaction-free detection of microwave pulses with a superconducting circuit

Shruti Dogra (), John J. McCord () and Gheorghe Sorin Paraoanu ()
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Shruti Dogra: Aalto University
John J. McCord: Aalto University
Gheorghe Sorin Paraoanu: Aalto University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract The interaction-free measurement is a fundamental quantum effect whereby the presence of a photosensitive object is determined without irreversible photon absorption. Here we propose the concept of coherent interaction-free detection and demonstrate it experimentally using a three-level superconducting transmon circuit. In contrast to standard interaction-free measurement setups, where the dynamics involves a series of projection operations, our protocol employs a fully coherent evolution that results, surprisingly, in a higher probability of success. We show that it is possible to ascertain the presence of a microwave pulse resonant with the second transition of the transmon, while at the same time avoid exciting the device onto the third level. Experimentally, this is done by using a series of Ramsey microwave pulses coupled into the first transition and monitoring the ground-state population.

Date: 2022
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DOI: 10.1038/s41467-022-35049-z

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