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Nord Quantique’s multimode encoding uses bosonic qubit technology that detect leakage errors to remove the qubit from the encoding space to enable building fault-tolerant quantum computers at utility scale

June 3, 2025 //  by Finnovate

Nord Quantique has successfully developed bosonic qubit technology with multimode encoding, outlining a path to a significant reduction in the number of qubits required for quantum error correction. This provides the system protection against many common types of errors, including bit flips, phase flips, and control errors.  Another key advantage over single-mode encoding is that leakage errors, which remove the qubit from the encoding space, can now be detected and corrected. The Tesseract code allows for increased error detection, and it is expected that this will translate into additional quantum error correction benefits as more modes are added. These results are therefore a key stepping stone in the development of this hardware-efficient approach. The core concept of the multimode approach centres on simultaneously using multiple quantum modes to encode individual qubits. Each mode represents a different resonance frequency inside an aluminium cavity and offers additional redundancy, which protects quantum information.

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