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This research presents a novel circuit QED architecture capable of dynamically tuning the full anisotropic Rabi model by balancing inductive and capacitive coupling paths. The design achieves this without external parametric drives or rotating-wave approximations, while simultaneously identifying a coherence sweet spot that suppresses dephasing and mitigates Purcell decay. These advancements offer significant potential for improving qubit readout contrast and controlling light-matter interactions in scalable quantum processors.
Dynamically Tunable Anisotropic Rabi Model in Circuit QED
arXiv:2512.14276v3 Announce Type: replace Abstract: We propose a circuit QED architecture that realizes the full anisotropic Rabi model (ARM) with in-situ tunability of its interaction symmetry. The circuit comprises a superconducting qubit coupled to a resonator through two simultaneous channels: a direct inductive path and a flux-tunable capacitive path mediated by a transmon coupler. By controlling the external magnetic flux, the destructive and constructive interferences between these paths continuously tune the ratio of the Jaynes-Cummings (JC) and anti-Jaynes-Cummings (AJC) couplings, sweeping the system across the entire ARM parameter space---from pure JC, through the standard Rabi regime, to pure AJC---without requiring rotating-wave approximations or external parametric drives. Furthermore, we identify a coherence sweet spot where the dispersive shift and photon shot-noise dephasing are suppressed. In the pure AJC regime, we demonstrate that the vacuum Rabi splitting vanishes and the Purcell decay rate is strongly mitigated while preserving high qubit readout contrast.
Abstract:We propose a circuit QED architecture that realizes the full anisotropic Rabi model (ARM) with in-situ tunability of its interaction symmetry. The circuit comprises a superconducting qubit coupled to a resonator through two simultaneous channels: a direct inductive path and a flux-tunable capacitive path mediated by a transmon coupler. By controlling the external magnetic flux, the destructive and constructive interferences between these paths continuously tune the ratio of the Jaynes-Cummings (JC) and anti-Jaynes-Cummings (AJC) couplings, sweeping the system across the entire ARM parameter space---from pure JC, through the standard Rabi regime, to pure AJC---without requiring rotating-wave approximations or external parametric drives. Furthermore, we identify a coherence sweet spot where the dispersive shift and photon shot-noise dephasing are suppressed. In the pure AJC regime, we demonstrate that the vacuum Rabi splitting vanishes and the Purcell decay rate is strongly mitigated while preserving high qubit readout contrast.
Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
arXiv:2512.14276 [quant-ph]
(or arXiv:2512.14276v3 [quant-ph] for this version)
From: S. Mojtaba Tabatabaei [view email] [v1] Tue, 16 Dec 2025 10:39:26 UTC (794 KB) [v2] Tue, 9 Jun 2026 14:10:29 UTC (667 KB) [v3] Mon, 28 Sep 2026 06:27:27 UTC (1,406 KB)
Full text under the publisher's open licence · 194 words
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