Strongly driven transmon as an incoherent noise source

• URL: http://arxiv.org/abs/2505.24549v1
• Date: Fri, 30 May 2025 12:57:57 GMT
• Title: Strongly driven transmon as an incoherent noise source
• Authors: Linda Greggio, Rémi Robin, Mazyar Mirrahimi, Alexandru Petrescu,
• Abstract summary: A coherently driven transmon can act as a source of incoherent noise to another circuit element coupled to it.<n>We show that the interaction with the driven transmon can be modeled as a diffusive process driving the TLS.
• Score: 42.110730614476104
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Under strong drives, which are becoming necessary for fast high-fidelity operations, transmons can be structurally unstable. Due to chaotic effects, the computational manifold is no longer well separated from the remainder of the spectrum, which correlates with enhanced offset-charge sensitivity and destructive effects in readout. We show here that these detrimental effects can further propagate to other degrees of freedom, for example to neighboring qubits in a multi-qubit system. Specifically, a coherently driven transmon can act as a source of incoherent noise to another circuit element coupled to it. By using a full quantum model and a semiclassical analysis, we perform the noise spectroscopy of the driven transmon coupled to a spectator two-level system (TLS), and we show that, in a certain limit, the interaction with the driven transmon can be modeled as a stochastic diffusive process driving the TLS.

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