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  • Open Access

Single-Period Floquet Control of Bosonic Codes with Quantum Lattice Gates

Tangyou Huang1, Lei Du1,*, and Lingzhen Guo2,3,†

  • 1Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, SE-41296 Göteborg, Sweden
  • 2Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, Tianjin 300072, China
  • 3Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Department of Physics, Tianjin University, Tianjin 300354, China

  • *Contact author: lei.du@chalmers.se
  • †Contact author: lingzhen_guo@tju.edu.cn
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Phys. Rev. Lett. 137, 060602 – Published 3 August, 2026

DOI: https://doi.org/10.1103/tnb8-3m8m

Abstract

Bosonic codes constitute a promising route to fault-tolerant quantum computing. Existing Floquet protocols enable analytical construction of bosonic codes but typically rely on slow adiabatic ramps with thousands of driving periods. In this Letter, we circumvent this bottleneck by introducing an analytical and deterministic Floquet method that directly synthesizes arbitrary unitaries within a single period. The phase-space unitary ensembles generated by our approach reproduce the Haar-random statistics, enabling practical pseudorandom states in continuous-variable systems. We prepare various prototypical bosonic codes from vacuum and implement single-qubit logical gates with high fidelities using quantum lattice gates. By harnessing the full intrinsic nonlinearity of Josephson junctions, quantum lattice gates decompose quantum circuits into primitive operations for efficient continuous-variable quantum computing.

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Phys. Rev. Lett. 137, 060602– Published 3 August, 2026
  • Received 8 January 2026
  • Revised 20 April 2026
  • Accepted 22 June 2026
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