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The paper is a theoretical resource estimate for simulating spin SYK-dot chains, not a hardware demonstration. It finds that a quantum advantage may require 15 to 21 or more qubits and two-qubit error rates near 10^-6, well beyond current NISQ devices. Its bound on entanglement that depends on qubits per dot, not total qubit count, is useful for judging where quantum simulation might beat classical methods.
A quantum advantage may need two-qubit gates with 10^(-6) error rates
Achieving quantum advantage with spin SYK-dot chains of 15-21 qubits demands high-fidelity performance, requiring two-qubit error rates of order 10^(-6) for even a single Trotter step.
Sayantan Dey of TCG CREST and Abel Carreras of Donostia International Physics Center, along with Siddhartha Patra of TCG CREST, indicate a quantum advantage could appear only with dots containing 15 to 21 qubits or more. This threshold demands two-qubit error rates of order 10–6, a level of precision currently beyond the reach of noisy intermediate-scale quantum (NISQ) hardware. At a configuration of (5,2), a variational circuit came within 3.6% of the exact energy of the system, validating the resource estimate assumptions. The entanglement across any cut in spin SYK-dot chains is demonstrably bounded by a function of the number…
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