Towards verified quantum speedup in a bosonic superconducting processor
ORAL · Invited
Abstract
We are developing a superconducting platform for boson sampling, aiming to demonstrate quantum speedup in a verifiable manner. Achieving this goal requires the deterministic preparation of nonclassical states in bosonic modes with high local dimensionality, the realization of high-fidelity beam-splitting interactions with all-to-all connectivity, and the ability to perform both homodyne/heterodyne detection and photon-counting measurements with high efficiency. In this presentation, I will discuss our experimental progress in developing these critical building blocks. Specifically, I will highlight results on fast state preparation achieved through combined charge and flux drives, as well as a novel protocol for homodyne and heterodyne detection on stationary bosonic modes, enabled by an ancillary qubit. Finally, I will outline our strategy for implementing quantum verification on this platform and achieving verified quantum speedup.
*This work is supported by the Knut and Alice Wallenberg foundation via the Wallenberg Centre for Quantum Technology (WACQT), and by European Union’s Horizon EuropeFramework Programme (EIC Pathfinder Challenge project VeriQuB) under Grant Agreement No. 101114899.
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Publication: 1. Eriksson, A. M. et al., Universal control of a bosonic mode via drive-activated native cubic interactions. Nat Commun 15, 2512 (2024).
2. Strandberg, I., Eriksson, A. M., Royer, B., Kervinen, M. & Gasparinetti, S., Digital Homodyne and Heterodyne Detection for Stationary Bosonic Modes. Phys. Rev. Lett. 133, 063601 (2024).
Presenters
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Simone Gasparinetti
- Chalmers University of Technology
- Chalmers Univ of Tech
- Chalmers University