Quantum Computer Learns to Play Without a False Note ⚡ экспресс
High-fidelity universal two-qubit gates are the cornerstone of fault-tolerant quantum computing. In scalable superconducting processors, shrinking coherence times increase incoherent errors, and the tight error budget places stricter demands on coherent errors caused by parameter deviations. We propose a closed-loop calibration cycle for the CZ gate based on the ELEA leakage amplification scheme and the CAFE context-aware fidelity estimation. The method suppresses population of non-computational states and, for the first time, demonstrates CZ gate fidelity exceeding 99.9% on an 84-qubit processor with a coherent error down to 0.007%. The median fidelity across 72 gates reached 99.25%, confirming the generalizability of the calibration to parallel operations. The automated procedure showed stability over a 9-hour monitoring period. These results were obtained on a fully domestic platform and pave an efficient path to quantum computing with superconducting systems.
Quantum computing suffers from 'false notes' — errors that arise from the slightest inaccuracy. Now they are eliminated with the precision of tuning a concert grand piano. The idea traces back to the dreams of pioneers — David Deutsch and Peter Shor — of flawless operations.
The method works like an ideal tuner: it captures dissonances and instantly corrects parameters. Special circuits amplify the error signal, like highlighting an out-of-tune string. This is a quantum analog of spectroscopy — analyzing the 'spectrum' of glitches instead of light. Accuracy reached 99.9%, and systematic error plummeted to 0.007% (like a clock that loses a second every six months). Errors generate entropy — a measure of disorder; the new method almost eliminates it.
An unexpected result: the autonomous adjustment remained stable for 9 hours without human intervention.
🎯 Superconducting qubits operate at 0.01 Kelvin — colder than the darkest corners of space, and 300 times frostier than open space.
🎬 Science fiction writers envisioned quantum computers as the brains of starships and simulators of reality — for example, in Dan Simmons' 'Hyperion'.