Coherent interaction-free detection of microwave pulses with a
superconducting circuit
- URL: http://arxiv.org/abs/2204.01657v2
- Date: Fri, 7 Jul 2023 13:14:48 GMT
- Title: Coherent interaction-free detection of microwave pulses with a
superconducting circuit
- Authors: Shruti Dogra, John J. McCord, Gheorghe Sorin Paraoanu
- Abstract summary: The interaction-free measurement is a fundamental quantum effect whereby the presence of a photosensitive object is determined without irreversible photon absorption.
We propose the concept of coherent interaction-free detection and demonstrate it experimentally using a three-level superconducting transmon circuit.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- 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.
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