Three separate research groups have demonstrated high fidelity rates in silicon-based quantum processors, demonstrating independently the feasibility of using silicon chips to conduct computations at the quantum level. The research results were published in the journal “Nature“. The three teams achieved fidelity levels above 99 percent in their experiments. Silicon chips can be used to build large-scale, error-correcting quantum computers.
More accurate results
Specifically, the team from the University of New South Wales (UNSW) in Australia demonstrated fidelity levels of up to 99.95 per cent for operations on a single qubit and 99.37 per cent on two qubits. The team at the Delft University of Technology in the Netherlands achieved 99.87% with one qubit and 99.65% with two qubits. The team at the RIKEN Institute in Japan achieved 99.84% fidelity in a one-qubit system and 99.51% with two qubits. In silicon-based quantum chips, dedication has always been relatively low. The results obtained in these new studies, however, are significant because, as Professor Andrea Morello, leading the Australian team, said:
UNSW’s system is based on a three-qubit chip, consisting of two phosphor atoms and an electron implanted in a silicon substrate. The two atoms can communicate via an electron, to which they are both connected. In this way, logical operations can be performed between the two nuclei, exploiting their nuclear spin to create a qubit.
said physicist Mateusz Mądzik of UNSW.
An excellent study divided by team
The other two teams created silicon and silicon-germanium alloy quantum dots and installed a two-electron qubit gate, a circuit of multiple qubits. They then modified the voltage applied to their respective systems, using a protocol called “gate set tomography” to characterize their installations, and both achieved a margin of error of less than 99 per cent.
Commented the team leader from the Netherlands Seigo Tarucha.
A few previous articles on Universe to find out more about the topic: