aiqbench takeQuantum Computing

Bluefors has identified a fundamental physics limit on scaling superconducting quantum computers, proving that wiring density is constrained by crosstalk rather than just engineering challenges. Their analysis establishes that achieving high-fidelity two-qubit gates restricts current processor designs to approximately 300 qubits within a standard 30 mm footprint. This work provides critical benchmarks for the industry as it navigates the transition from proof-of-concept devices to large-scale, fault-tolerant systems.

Source coveringQuantum Zeitgeist

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Wiring density limits qubit control, Bluefors research shows

Quantum ZeitgeistSeptember 9, 20265 min read

Bluefors research in Physical Review Letters reveals how closely packed microwave lines can be before impacting superconducting qubit control.

Bluefors Research has determined a fundamental physics limit to scaling up quantum computers, revealing how densely microwave control lines can be packed together without corrupting qubit operations. A paper published in Physical Review Letters frames the question of wiring density not as an engineering problem, but as a question of physics; the team integrated control signal crosstalk directly into a two-qubit Hamiltonian. Researchers found a direct relationship between control line crosstalk and quantum gate fidelity, with benchmark average gate fidelity of 99.99% requiring an ELFEXT of roughly −43 dB for single-qubit operations and −73…

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