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This study identifies a novel mechanism for generating and controlling entanglement in superconducting qubits via parametric driving, revealing that specific driving amplitudes can completely suppress entanglement through a phenomenon termed "coherent destruction of entanglement." By moving beyond the standard rotating-wave approximation using generalized Van Vleck perturbation theory, the research provides an analytical framework essential for optimizing qubit hybridization in multiphoton resonance regimes. These findings offer critical insights for advancing quantum circuit design and error mitigation strategies in scalable quantum hardware.
Floquet Entanglement Generation in Parametrically Driven Coupled Superconducting Qubits
arXiv:2606.07797v1 Announce Type: new Abstract: We investigate the dynamical generation of entanglement in a system of two superconducting qubits coupled through a parametrically driven longitudinal interaction. Using Floquet theory and exact numerical simulations, we analyze the time evolution of the system initialized in a separable ground state. Our results reveal a nontrivial mechanism for entanglement generation, fundamentally distinct from the conventional resonant excitation to an entangled eigenstate. We show that this mechanism emerges when two initially separable eigenstates are mixed by the periodic driving under multiphoton resonance conditions. Since the effect cannot be captured within a standard rotating-wave approximation, we employ generalized Van Vleck near-degenerate perturbation theory to derive an effective analytical description. Within this framework, we demonstrate that the sustained entanglement originates from the hybridization of the dominant Floquet states, namely those with the largest overlap with the initial ground state. Furthermore, the degree of entanglement can be efficiently controlled through the driving amplitude. In particular, for specific amplitudes, the entanglement is fully suppressed. We term this phenomenon as coherent destruction of entanglement.
Abstract:We investigate the dynamical generation of entanglement in a system of two superconducting qubits coupled through a parametrically driven longitudinal interaction. Using Floquet theory and exact numerical simulations, we analyze the time evolution of the system initialized in a separable ground state. Our results reveal a nontrivial mechanism for entanglement generation, fundamentally distinct from the conventional resonant excitation to an entangled eigenstate. We show that this mechanism emerges when two initially separable eigenstates are mixed by the periodic driving under multiphoton resonance conditions. Since the effect cannot be captured within a standard rotating-wave approximation, we employ generalized Van Vleck near-degenerate perturbation theory to derive an effective analytical description. Within this framework, we demonstrate that the sustained entanglement originates from the hybridization of the dominant Floquet states, namely those with the largest overlap with the initial ground state. Furthermore, the degree of entanglement can be efficiently controlled through the driving amplitude. In particular, for specific amplitudes, the entanglement is fully suppressed. We term this phenomenon as coherent destruction of entanglement.
Quantum Physics (quant-ph); Superconductivity (cond-mat.supr-con)
arXiv:2606.07797 [quant-ph]
(or arXiv:2606.07797v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2606.07797 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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