Level attraction from interference in two-tone driving
arxiv(2024)
摘要
Coherent and dissipative couplings, respectively characterised by energy
level repulsion and attraction, each have different applications for quantum
information processing. Thus, a system in which both coherent and dissipative
couplings are tunable on-demand and in-situ is tantalising. A first step
towards this goal is the two-tone driving of two bosonic modes, whose
experimental signature was shown to exhibit controllable level repulsion and
attraction by changing the phase and amplitude of one drive. However, whether
the underlying physics is that of coherent and dissipative couplings has not
been clarified, and cannot be concluded solely from the measured resonances (or
anti-resonances) of the system. Here, we show how the physics at play can be
analysed theoretically. Combining this theory with realistic finite-element
simulations, we deduce that the observation of level attraction originates from
interferences due to the measurement setup, and not dissipative coupling.
Beyond the clarification of a novel origin for level attraction attributed to
interference, our work demonstrate how effective Hamiltonians can be derived to
appropriately describe the physics.
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