Nu Quantum has released a groundbreaking theory paper on Quantum Error Correction (QEC), demonstrating how modular quantum computing architectures can enable scalable, fault-tolerant distributed quantum systems. The paper, titled “Distributed quantum error correction based on hyperbolic Floquet codes,” outlines a pathway to construct logical qubits using physical qubits distributed across interconnected processors, overcoming the limitations of monolithic designs.
Key findings include:
- Distributed-QEC is feasible: Logical qubits can be built using physical qubits hosted in separate processors connected via entanglement links, eliminating the need for large, single-processor systems.
- Realistic network requirements: Interconnects with 99.5% entanglement fidelity and local 2-qubit gate fidelities of 99.99% are sufficient for fault-tolerant systems, targets that align with current industry advancements.
- Efficiency gains: High-rate QEC codes, such as hyperbolic Floquet codes, offer greater efficiency than traditional surface codes, reducing the physical qubit overhead required for error correction.
This work complements recent progress by companies like Google, Quantinuum, and QuEra, which have demonstrated high-quality qubits and error correction in single processors. Nu Quantum’s approach enables scalable, modular systems by connecting smaller quantum processing units (QPUs) via sparse networks, paving the way for large-scale, fault-tolerant quantum computers.
The paper is available on arXiv here. For more details, see the original press release here.
January 28, 2025
