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For the First Time, Engineers Measure Accuracy of 2 Qubits in Silicon--and It Works


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Two qubits in use.

University of New South Wales researchers have quantified the accuracy of two-quantum-bit operations in silicon.

Credit: UNSW

Researchers at the University of New South Wales (UNSW) in Australia for the first time have quantified the accuracy of two-quantum-bit (qubit) operations in silicon, in another step toward reliable quantum computing.

Said UNSW's Andrew Dzurak, "Once you've got [one-qubit and two-qubit operations], you can perform any computation you want—but the accuracy of both operations needs to be very high."

The researchers previously built the first silicon quantum logic gate to enable communication between two qubits, and refined its fidelity to a maximum threshold of 98%.

This milestone showed silicon could find use in future quantum computers, in more powerful logic systems composed of millions of qubits, according to the researchers.

The team said, "Two-qubit fidelities reaching the required limits for fault-tolerance are...within reach, and underpin silicon as a technology platform with good prospects for scalability to the large numbers of qubits needed for universal quantum computing."

From ScienceAlert
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