TBNQuantum
Mechanical trisqueezing in circuit quantum acoustodynamics with SNAIL devices
Publication: quant-ph updates on arXiv.org
Author: Yi-Zhou Bu, Matteo Fadel, Kai Xu, Heng Fan
Source published: 16/10/2026, 04:00:00 UTC
Briefing created: 16/10/2026, 05:01:31 UTC
Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 16/10/2026, 04:13:24 UTC.
Briefings
This preprint proposes a circuit quantum acoustodynamics (cQAD) architecture using a superconducting nonlinear asymmetric inductive element (SNAIL) coupled to a high-overtone bulk acoustic-wave resonator (HBAR). By combining cubic nonlinearity with parametric flux driving, the device generates trisqueezed mechanical states via three-wave mixing, producing a Wigner function with negative regions. The study derives the effective Hamiltonian, identifies drive frequencies, and quantifies coupling strengths for current fabrication capabilities, establishing a hardware-efficient route to universal continuous-variable quantum computation.
Key points
- The SNAIL device provides cubic nonlinearity to enable trisqueezing, which is impossible in standard cQAD setups due to intrinsic Kerr nonlinearity.
- Parametric flux driving combined with the SNAIL's cubic nonlinearity creates three-wave mixing to generate the necessary trisqueezed mechanical states.
Context
Circuit quantum acoustodynamics experiments have achieved bilinear and quartic operations by coupling mechanical modes to transmon qubits, but these devices lack the nonlinearity needed for odd-order Hamiltonians like trisqueezing. This work introduces a new SNAIL-based architecture to overcome this limitation.
Limitations
The evidence is a preprint from October 2026, so fabrication parameters and experimental validation are not yet available. Specific drive frequencies and flux modulation values are not provided, and the achievable coupling strengths remain theoretical estimates.
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