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Financement de l’UE (226 277 €) : Résonateur paramétrique programmable avec modulation indépendante basée sur G-SNAIL Hor17/03/2026 Programme de recherche et d'innovation de l'UE « Horizon »
Vue d’ensemble
Texte
Résonateur paramétrique programmable avec modulation indépendante basée sur G-SNAIL
Two paradigmatic approaches for generating arbitrary continuous-variable (CV) states in a qubit–resonator system rely on time-modulating either the qubit drive or the resonator drive. However, the intrinsic Kerr nonlinearity of superconducting cavities imposes a fundamental limit on operation fidelity. Terminating a resonator with a Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL) can mitigate this limitation by providing flux-tunable third- and fourth-order nonlinearities. While the SNAIL’s nonlinear terms are tunable in general, they become fixed at the Kerr-free point, constraining control over gate strengths. This proposal develops a Programmable Parametric Resonator incorporating a Gradiometric SNAIL (G-SNAIL), which is a two-loop, symmetric extension of the SNAIL with a central Josephson junction array flanked by two smaller-critical-current junctions. In contrast to standard SNAILs, the G-SNAIL enables independent, simultaneous tuning of cubic and quartic nonlinearities with negligible frequency perturbation, preserving coherence while expanding functional versatility. This is achieved via dual-flux biasing of the loops, allowing continuous control, and sign reversal, of the Kerr coefficient through the interplay of cubic and quartic terms. The G-SNAIL-terminated resonator functions as a compact, reconfigurable nonlinearity module capable of implementing a universal set of bosonic operations within a single element, reducing hardware complexity by eliminating multiple fixed-design components. The proposed program includes: (i) design, fabrication, and spectral characterization of the G-SNAIL resonator; (ii) Kerr-coefficient mapping to quantify its reconfigurability; and (iii) benchmarking via universal CV mode control and non-Gaussian state generation. This platform paves the way for scalable, fault-tolerant CV quantum computation, with potential transformative impact on high-precision quantum sensing.
| Aalto Korkeakoulusaatio sr | 226 277 € |
https://cordis.europa.eu/project/id/101283792
Cette annonce se réfère à une date antérieure et ne reflète pas nécessairement l’état actuel. L’état actuel est présenté à la page suivante : Aalto-korkeakoulusäätiö sr, Espoo, Finlande.