Project description
Improving precision in quantum computing circuits
In superconducting circuits, creating arbitrary continuous-variable states traditionally relies on modulating either the qubit or resonator drive. However, this standard technique is ultimately limited by the cavity’s inherent Kerr non-linearity, which distorts the states and restricts operational precision. Supported by the Marie Skłodowska-Curie Actions programme, the PPRISM-G project aims to overcome this bottleneck by developing a programmable parametric resonator that features independent gradiometric superconducting non-linear asymmetric inductive element (G-SNAIL) modulation to achieve highly tunable, low-noise qubit readout in quantum computing. The project’s key objectives include building the G-SNAIL resonator, evaluating its reconfigurability by mapping the Kerr coefficient, and validating performance through non-Gaussian state creation and universal continuous-variable mode control.
Objective
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.
Fields of science (EuroSciVoc)
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CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA)
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships
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(opens in new window) HORIZON-MSCA-2025-PF
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02150 Espoo
Finland
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