Kavli Affiliate: Gary A. Steele
| First 5 Authors: Byoung-moo Ann, Gary A. Steele, , ,
| Summary:
It is known that the quantum nature of the electromagnetic vacuum is
responsible for the Lamb shift, which is a crucial phenomenon in quantum
electrodynamics (QED). In circuit QED, the readout or bus resonators that are
dispersively coupled can result in a significant Lamb shift, much larger than
that in the original broadband cases. However, previous approaches or proposals
for controlling the Lamb shift in circuit QED demand overheads in circuit
designs or non-perturbative renormalization of the system’s eigenbases, which
can impose formidable limitations.In this work, we propose and demonstrate an
efficient and cost-effective method for controlling the Lamb shift of
fixed-frequency transmons. We employ the drive-induced longitudinal coupling
between the transmon and resonator. By simply using an off-resonant
monochromatic driving near the resonator frequency, we can regulate the Lamb
shift from 32 to -30 MHz without facing the aforementioned challenges. Our work
establishes an efficient way of engineering the fundamental effects of the
electromagnetic vacuum and provides greater flexibility in non-parametric
frequency controls of multilevel systems.
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