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Study shows modular quantum systems work even with imperfect links

Study shows modular quantum systems work even with imperfect links
Source: interestingengineering
Author: @IntEngineering
Published: 8/26/2025

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A recent study led by the University of California, Riverside, demonstrates through simulations that modular quantum computing systems can scale effectively even when the connections between individual quantum chips are imperfect and noisy. Traditionally, scaling quantum computers has been challenging due to fragile qubits and noisy inter-chip links, especially when chips operate in separate cryogenic environments. However, the research shows that as long as each chip maintains high fidelity, the inter-chip connections can tolerate noise levels up to ten times greater than those within a single chip without compromising the system’s ability to detect and correct errors. This finding suggests that building larger, fault-tolerant quantum computers may be achievable sooner than previously anticipated without waiting for perfect hardware. The study emphasizes that simply increasing the number of qubits is insufficient for practical quantum computing; fault tolerance is crucial. Logical qubits, which are the usable units in quantum programs, are formed by combining many physical qubits to enable error correction, often using techniques like the surface code. By simulating thousands of modular

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quantum-computingfault-tolerancequantum-chipsquantum-systemserror-correctionscalable-quantum-computersquantum-hardware