Coherence properties of a spin in a squeezed resonator

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A promising venue for hybrid quantum computation involves the strong coupling between impurity spins and superconducting circuits. This coupling can be controlled and enhanced by preparing superconducting resonators in nonclassical states, such as squeezed states. In this work, we theoretically study the effects of these states on the coherence properties of the spin. We develop an analytic approach based on the Schrieffer-Wolff transformation that allows us to quantitatively predict the dynamics of the spin, and we numerically confirm its validity. We find that squeezing can enhance the coupling between the resonator and the spin. However, at the same time, it amplifies the photon noise and enhances the spin decoherence. Our work demonstrates a major impediment in using squeezing to reach the strong-coupling limit.

Original languageEnglish
Article number022617
JournalPhysical Review A
Issue number2
StatePublished - Feb 2022

Bibliographical note

Publisher Copyright:
© 2022 American Physical Society.


This work was supported by the Israel Science Foundation, Grants No. 426/15, No. 151/19, No. 154/19, and No. 898/19. I.S. acknowledges support from the Institute for Nanotechnology and Advanced Materials at Bar-Ilan University. We wish to thank T. Kontos, D. Vion, and L. Bello for inspiring and fruitful discussions.

FundersFunder number
Institute for Nanotechnology and Advanced Materials at Bar-Ilan University
Israel Science Foundation151/19, 154/19, 898/19, 426/15


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