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Shanxi University researchers have demonstrated a two-qubit controlled-Z gate with 99.99% fidelity using Rydberg atoms, overcoming previous limitations caused by level-crossing issues and noise susceptibility. This advancement relies on rapid adiabatic population transfer with shaped laser pulses that maintain high precision despite significant fluctuations in Rabi frequency and detuning parameters. By stabilizing fundamental quantum operations against real-world imperfections, this breakthrough brings practical fault-tolerant quantum computing significantly closer to reality.
Shanxi University Team Simulates 9999 Fidelity CZ Gate
A two-qubit controlled-Z gate now reaches 0. 9999 fidelity, exceeding the performance of previous methods. This level of precision is maintained even with fluctuations of up to ±2% in Rabi frequency and ±1% in detuning, a considerable improvement over existing approaches.
Until now, achieving high-fidelity controlled-Z (CZ) gates for Rydberg atoms has been limited by level-crossing issues and susceptibility to noise during quantum operations. Now, researchers at Shanxi University have designed a new CZ gate scheme achieving a fidelity of 0.9999. This advance utilises level-crossing-free echoing rapid adiabatic population transfer with specifically shaped laser pulses, maintaining a fidelity above 0.999 even with fluctuations in laser power and frequency of up to ±2% and ±1% respectively. This…
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