Nord’s volume has successfully developed Bosonic Qubit technology with multimode encoding, outlines the path to a significant reduction in the number of qubits required for quantum error correction.
The result is an approach to quantum error correction that provides a smaller, more powerful system that consumes some of the energy.
These small systems are easier to develop for utility scales due to the size and low requirements of cryogenic and control electronics.
Multimode encoding: removes the need for physical qubits
To perform effective quantum error correction, the company implements advanced boson code known as Tesseract code.
This provides system protection against many common types of errors, such as bit flips, phase flips, and control errors. Another important advantage of single-mode encoding is that it can detect and correct leakage errors that remove qubits from the encoding space.
In this demonstration, we excluded incomplete runs using post-selection selection and discarded 12.6% of the data for each round. This demonstrated excellent stability of quantum information, but no measurable decay was observed in 32 error correction cycles.
The TesserAct code can increase error detection, which is expected to translate into the advantages of additional quantum error correction as more modes are added.
Therefore, these results are important stepping stones in the development of this hardware-efficient approach.
“We’re looking forward to seeing you get the most out of our business,” explains Julien Camirand-Lemyre, CEO of Nord Quantique. “Multimode encoding allows you to build a quantum computer with excellent error correction, but all of these physical qubits are unaffected.
“Beyond smaller and more practical sizes, our machines consume just a small portion of our energy. This makes them appealing to, for example, HPC centers with the highest energy costs.”
Encode individual qubits for better quantum error correction
The core concept of the multimode approach is concurrently focused on encoding individual qubits using multiple quantum modes. Each mode represents a different resonant frequency within the aluminum cavity and provides additional redundancy to protect quantum information.
The number of photons permeate each mode is also increased, providing further protection and further escalation of the QEC function.
This breakthrough allows for additional quantum error correction capacity and additional means of detecting errors while maintaining a fixed number of qubits.
It also brings more benefits and compound as they scale, paving a new pathway for fault-resistant quantum computing.
Examples include reducing the effects of auxiliary damping errors, enhancing logical lifetimes by suppressing silent errors, and extracting trust information to further improve error detection and correction strategies.
The road to fault-resistant quantum computing
“We are pleased to see the advances that Nord Quantique has made after years of working on developing multimode operations in states encoded in superconducting cavity,” said Yvonne Gao, assistant professor at the National University of Singapore and a lead researcher at the Quantum Technology Centre.
“The approach of encoding logical qubits in multimode tesseract states is a very effective way to address quantum error correction and I am impressed with these results. They are important advances in the industry’s journey to utility-scale quantum computing.”
Through this scientific advancement, Nord Qualique now has a clear path to provide fault tolerance at the utility scale. Teams continue to improve results by leveraging the system in additional modes to push the boundaries of quantum error correction.
By 2029, the company is expected to have its first utility-scale quantum computer with over 100 logical qubits.
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