All-microwave Lamb shift engineering for a fixed frequency multi-level superconducting qubit

• URL: http://arxiv.org/abs/2304.11782v3
• Date: Tue, 07 Jan 2025 05:58:22 GMT
• Title: All-microwave Lamb shift engineering for a fixed frequency multi-level superconducting qubit
• Authors: Byoung-moo Ann, Gary A. Steele,
• Abstract summary: Lamb shift is a crucial phenomenon in quantum electrodynamics (QED) 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. In this work, we propose and demonstrate an all-microwave method for controlling the Lamb shift of fixed-frequency transmons.
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• Abstract: It is known that 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 of the qubit. 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 all-microwave 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 drive near the resonator frequency, we can control the net Lamb shift up to 30 MHz and engineer it to zero with the drive-induced longitudinal coupling 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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