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

Shruti Dogra*, John J. McCord, Gheorghe Sorin Paraoanu

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
47 Downloads (Pure)


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.

Original languageEnglish
Article number7528
Pages (from-to)1-9
Number of pages9
JournalNature Communications
Issue number1
Publication statusPublished - Dec 2022
MoE publication typeA1 Journal article-refereed


Dive into the research topics of 'Coherent interaction-free detection of microwave pulses with a superconducting circuit'. Together they form a unique fingerprint.

Cite this