Scientists achieve key elements for fault-tolerant quantum computation in silicon spin qubits
Researchers from RIKEN and QuTech -- a collaboration between TU Delft and the Netherlands Organisation for Applied Scientific Research -- have achieved a key milestone toward the development of a fault-tolerant quantum computer. They were able to demonstrate a two-qubit gate fidelity of 99.
In the course of the experiments, they discovered that a property called the Rabi frequency -- a marker of how the qubits change states in response to an oscillating field -- is key to the performance of the system, and they found a range of frequencies for which the single-qubit gate fidelity was 99.8 percent and the two-qubit gate fidelity was 99.5 percent, clearing the required threshold.
To test the capability of the new system, the researchers implemented a two-qubit Deutsch-Jozsa algorithm and the Grover search algorithm. Both algorithms output correct results with a high fidelity of 96%-97%, demonstrating that silicon quantum computers can perform quantum calculations with high accuracy.
France Dernières Nouvelles, France Actualités
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