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The reported result is a two-qubit gate fidelity of 99.76% and single-qubit fidelity above 99.97% in cryogenically cooled caesium atoms, with the claim that cooling improves performance without changing the hardware design. For quantum readers, the key questions are whether these numbers hold up under independent replication and whether the gains persist as arrays scale to the many qubits needed for error correction. Gate fidelity alone does not measure a system's usefulness, so the claim should be judged against error-correction thresholds and reproducible benchmarks.
Princeton University Achieves 99.76% Quantum Entanglement in Cryo Array
Achieving 99. 76% accuracy on a quantum operation whilst operating at lower energy levels was previously considered mutually exclusive. Now, physicists have demonstrated this high-fidelity two-qubit gate in an array of cooled caesium atoms, matching leading room temperature performance with significantly reduced potential for errors caused by atomic instability.
Achieving universal quantum gate sets previously demanded compromises between operating temperature and control fidelity; leading implementations operated at room temperature. High-fidelity universal quantum gates now operate within a cryogenic atom array of caesium atoms, achieving single-qubit operations at 99.970 ±0.002% and two-qubit entangling gates at 99.76 ±0.08%. Highly accurate quantum gates are created using neutral caesium atoms cooled to extremely low temperatures, overcoming a longstanding challenge in building more effective systems.…
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