Related papers: Bosonic quantum control with a weakly coupled fluxonium qubit

Bosonic quantum control with a weakly coupled fluxonium qubit

URL: http://arxiv.org/abs/2609.01817v1
Date: Tue, 01 Sep 2026 19:45:50 GMT
Title: Bosonic quantum control with a weakly coupled fluxonium qubit
Abstract summary: We present a numerical case study of a bit-flip protected flux operating as the control qubit in a single-mode resonator-flux device.<n>We numerically simulate the strongly driven regime of the resonator using a semiclassical formulation that maps the full dispersive expansion as order-by-order frequency shifts.<n>We propose an improved ECD sequence that accounts for the effects of photon loss and spurious nonlinear terms on resonator trajectories.
Score: 0.3195958927480583
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Echoed Conditional Displacement (ECD) gates constitute a fundamental building block for quantum control of harmonic oscillator modes. However, bit-flips of the auxiliary qubit remain a dominant error mechanism for this kind of bosonic control. In this work, we present a numerical case study of a bit-flip protected fluxonium operating as the control qubit and numerically implement ECD gates in a single-mode resonator-fluxonium device, demonstrating that fidelities exceeding 99.9% are possible. We systematically investigate the resonator dynamics using a combination of semiclassical trajectories and master equation simulations, numerically revealing asymptotic saturation of the dispersive shift in the strongly driven regime of the resonator. We develop an efficient technique to numerically simulate the strongly driven regime of the resonator using a semiclassical formulation that maps the full perturbation series in the dispersive expansion as order-by-order frequency shifts. This provides a compact polynomial description of the resonator which is intuitive and remains valid throughout the dispersive regime. Furthermore, we propose an improved ECD sequence that accounts for the effects of photon loss and spurious nonlinear terms on resonator trajectories.

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