Quantum bath engineering of a high impedance microwave mode through quasiparticle tunneling

Gianluca Aiello, Mathieu Féchant, Alexis Morvan, Julien Basset, Marco Aprili, Julien Gabelli and Jérôme Estève ()
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Gianluca Aiello: CNRS, Université Paris Saclay
Mathieu Féchant: CNRS, Université Paris Saclay
Alexis Morvan: CNRS, Université Paris Saclay
Julien Basset: CNRS, Université Paris Saclay
Marco Aprili: CNRS, Université Paris Saclay
Julien Gabelli: CNRS, Université Paris Saclay
Jérôme Estève: CNRS, Université Paris Saclay

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract In microwave quantum optics, dissipation usually corresponds to quantum jumps, where photons are lost one by one. Here we demonstrate a new approach to dissipation engineering. By coupling a high impedance microwave resonator to a tunnel junction, we use the photoassisted tunneling of quasiparticles as a tunable dissipative process. We are able to adjust the minimum number of lost photons per tunneling event to be one, two or more, through a dc voltage. Consequently, different Fock states of the resonator experience different loss processes. Causality then implies that each state experiences a different energy (Lamb) shift, as confirmed experimentally. This photoassisted tunneling process is analogous to a photoelectric effect, which requires a quantum description of light to be quantitatively understood. This work opens up new possibilities for quantum state manipulation in superconducting circuits, which do not rely on the Josephson effect.

Date: 2022
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DOI: 10.1038/s41467-022-34762-z

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