26th Australian Institute of Physics Congress and the Australian and New Zealand Conference on Optics and Photonics

Dissipation engineering in parametrically coupled Surface Acoustic Waves

Not scheduled

20m

Belinda Hutchinson Building (The University of Sydney )

Contributed Oral ANZOS | Photonics and Optics (ANZCOP)

Speaker

Pasquale Scarlino

Description

We report parametrically activated coupling between surface-acoustic-wave (SAW) phonon modes, mediated by their mutual interaction with a flux-tunable superconducting SQUID array resonator. This work builds on the multimode platform employed in [1]. Exploiting the in-situ flux tunability of the array, we pump the SQUID array resonator at the frequency difference of two selected acoustic modes, achieving frequency conversion between the modes.
The distinctive trait of this scheme is the emergence of dissipative coupling, together with the more conventional coherent parametric coupling. Dissipative coupling has to be interpreted as correlated decay of the coupled modes in the environment. Both coherent and dissipative coupling can be continuously tuned via the amplitude and detuning of the pump tone and the detuning of the SQUID array resonator, which allows to transit from purely coherent beam-splitter interaction to purely dissipative coupling regimes. This establishes a versatile route to dissipation engineering and reservoir-based control in a multimode acoustic platform, with prospects for dissipative state stabilisation, non-reciprocal phonon transport, and autonomous quantum error suppression.
Keywords: parametric coupling, in-situ tunability, dissipation engineering

[1] M. Scigliuzzo, L. Peyruchat, R. M. Marabini, C. Becker, V. Jouanny, P. Delsing, and P. Scarlino, Quantum Acoustics with Tunable Nonlinearity in the Superstrong Coupling Regime, PRX Quantum 7, 010359 (2026)