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Nord Quantique’s Multimode Bosonic Qubits Slash Qubit Overhead and Energy Use

The Sherbrooke-based quantum computing firm demonstrated no observable decay across 32 error-correction cycles with its Tesseract code.

A bosonic qubit developed by Nord Quantique
Nord Quantique CEO Julien Camirand-Lemyre shows off a qubit at Nord Quantique’s lab in Sherbrooke, Que. on Monday, May 12, 2025. Evan Buhler/The Globe and Mail
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Overview

  • Nord Quantique’s Tesseract code combines multimode encoding with bosonic qubits to protect against bit flips, phase flips, control errors and leakage errors while reducing physical qubit requirements.
  • Through erasure-based error suppression and mid-circuit measurements, the company showed stable quantum information over 32 consecutive correction cycles, discarding about 12.6% of imperfect runs.
  • Researchers estimate that computing an RSA-830 cryptographic challenge at 1 MHz would consume just 120 kWh on this system—about 90% less energy than a classical high-performance computing setup.
  • A full-scale machine with 1,000 logical qubits based on this architecture is expected to fit within a 20 square-meter footprint suitable for standard data centers.
  • Nord Quantique aims to demonstrate processors with more than 100 logical qubits by 2029, marking a key step toward scalable, fault-tolerant quantum computing.