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<p>Photon-pressure circuits are the circuit implementation of the cavity optomechanical Hamiltonian and discussed for qubit readout, low-frequency quantum photonics and dark matter axion detection. Due to the enormous design flexibility of superconducting circuits, photon-pressure systems provide fascinating possibilities to explore unusual parameter regimes of the optomechanical Hamiltonian. Here, we report the realization of a photon-pressure platform, in which a GHz circuit interacts with a MHz circuit via a magnetic-flux-tunable combination of dispersive and dissipative photon-pressure. In addition, both coupling rates are considerably enhanced by nonlinearities of the GHz-mode, which leads to the multi-photon coupling rates scaling stronger with the pump photon number <i>n</i><sub>c</sub> than the usual <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\sqrt{{n}_{\mathrm{c}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msqrt> <mrow> <msub> <mrow> <mi>n</mi> </mrow> <mrow> <mi mathvariant="normal">c</mi> </mrow> </msub> </mrow> </msqrt> </math></EquationSource> </InlineEquation> dependence. We demonstrate that interference of the two interaction paths leads to a Fano-like response in photon-pressure induced transparency, and that the dynamical backaction is considerably modified compared to the dispersive case, including a parametric instability caused by a red-detuned pump tone.</p>

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Tunable and nonlinearity-enhanced dispersive-plus-dissipative coupling in photon-pressure circuits

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月24日

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  • Mohamad Kazouini,
  • Janis Peter,
  • Zisu Emily Guo,
  • Benedikt Wilde,
  • Kevin Uhl,
  • Dieter Koelle,
  • Reinhold Kleiner,
  • Daniel Bothner

摘要

Photon-pressure circuits are the circuit implementation of the cavity optomechanical Hamiltonian and discussed for qubit readout, low-frequency quantum photonics and dark matter axion detection. Due to the enormous design flexibility of superconducting circuits, photon-pressure systems provide fascinating possibilities to explore unusual parameter regimes of the optomechanical Hamiltonian. Here, we report the realization of a photon-pressure platform, in which a GHz circuit interacts with a MHz circuit via a magnetic-flux-tunable combination of dispersive and dissipative photon-pressure. In addition, both coupling rates are considerably enhanced by nonlinearities of the GHz-mode, which leads to the multi-photon coupling rates scaling stronger with the pump photon number nc than the usual \(\sqrt{{n}_{\mathrm{c}}}\) n c dependence. We demonstrate that interference of the two interaction paths leads to a Fano-like response in photon-pressure induced transparency, and that the dynamical backaction is considerably modified compared to the dispersive case, including a parametric instability caused by a red-detuned pump tone.