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Arbitrary high-fidelity binomial codes from multiphoton spin-boson interactions

Pradip Laha* and Peter van Loock†

  • *Contact author: plaha@uni-mainz.de
  • †Contact author: loock@uni-mainz.de
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Phys. Rev. Research 8, 013237 – Published 5 March, 2026

DOI: https://doi.org/10.1103/58jr-l1x6

Abstract

Encoding a qubit in the continuous degrees of freedom of a quantum system, such as bosonic modes, is a powerful alternative to modern quantum error correction (QEC). Among the most prominent bosonic QEC codes, binomial codes provide protection against loss and dephasing errors by encoding logical states in finite superpositions of Fock states with binomially weighted coefficients. While much attention has been given to their error-correcting capabilities and integration into fault-tolerant architectures, efficient methods for generating arbitrary binomial codewords remain scarce. In this work, we propose a scheme for generating these codewords by exploiting nonlinear multiphoton interactions between a continuous-variable bosonic mode (oscillator) and a two-level system (spin/qubit). Our proposed scheme assumes the ability to prepare the oscillator in an arbitrary Fock state and the qubit in an arbitrary superposition of its basis states and access to arbitrarily high multiphoton interactions. To enhance the experimental feasibility of our scheme, we further demonstrate how to reduce the required order parameter of multiphoton interactions by a factor of two for a special class of code states.

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Phys. Rev. Research 8, 013237– Published 5 March, 2026
  • Received 16 July 2025
  • Accepted 2 February 2026
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