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

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.

SUBMITTER: Dogra S

PROVIDER: S-EPMC9729670 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature

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

Dogra Shruti S McCord John J JJ Paraoanu Gheorghe Sorin GS

Nature communications 20221207 1

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 r ...[more]

PMID: 36476574

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