Instabilities near ultrastrong coupling in microwave optomechanical cavity

• URL: http://arxiv.org/abs/2302.00421v2
• Date: Fri, 18 Aug 2023 12:43:11 GMT
• Title: Instabilities near ultrastrong coupling in microwave optomechanical cavity
• Authors: Soumya Ranjan Das, Sourav Majumder, Sudhir Kumar Sahu, Ujjawal Singhal, Tanmoy Bera, and Vibhor Singh
• Abstract summary: We experimentally realize a cavity-electromechanical device using a superconducting waveguide cavity and a mechanical resonator. In the presence of a strong pump, the mechanical-polaritons splitting can nearly reach 81% of the mechanical frequency, overwhelming all the dissipation rates.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: With artificially engineered systems, it is now possible to realize the coherent interaction rate, which can become comparable to the mode frequencies, a regime known as ultrastrong coupling (USC). We experimentally realize a cavity-electromechanical device using a superconducting waveguide cavity and a mechanical resonator. In the presence of a strong pump, the mechanical-polaritons splitting can nearly reach 81% of the mechanical frequency, overwhelming all the dissipation rates. Approaching the USC limit, the steady-state response becomes unstable. We systematically measure the boundary of the unstable response while varying the pump parameters. The unstable dynamics display rich phases, such as self-induced oscillations, period-doubling bifurcation, period-tripling oscillations, and ultimately leading to the chaotic behavior. The experimental results and their theoretical modeling suggest the importance of residual nonlinear interaction terms in the weak-dissipative regime.

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