/Silicon two qubit fidelity measured for first time (via Qpute.com)
Silicon two qubit fidelity measured for first time

Silicon two qubit fidelity measured for first time (via Qpute.com)


UNSW researchers have measured the accuracy of two qubit operations in silicon for the first time, giving fidelity results that “confirm the promise” of silicon as a viable and scalable platform for future quantum computers.

Professor Andrew Dzurak’s team at UNSW Engineering was the first to build a quantum logic gate in silicon – making calculations between two qubits of information possible – in 2015.

The achievement has been emulated by groups around the world, but an accurate assessment of the gates’ fidelities had proven difficult, meaning their true accuracy remained an unknown.

In a paper published in Nature today, Dzurak and his team demonstrate the successful measurement of fidelity in a silicon two qubit gate using a method called ‘Clifford-based randomised benchmarking’.

“To assess the accuracy of a qubit system we need to simulate how that system behaves for any possible calculation that a quantum computer is tasked to do. For calculations between just two qubits there are already over 11000 possible basic operations that can be performed. Each one produces a specific rotation of one spin dependent on the state of the other,” said Dzurak.

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