Communications of the ACM
Quantum Computers: 10-Fold Boost in Stability Achieved
Australian researchers say they have dramatically expanded the time in which future silicon quantum computers would be able to perform calculations.
Credit: UNSW Newsroom
Australian researchers say they have dramatically expanded the time in which future silicon quantum computers would be able to perform calculations.
Researchers at the University of New South Wales (UNSW) report their new quantum bit (qubit) can remain in a stable superposition for 10 times longer than previously achieved.
UNSW's Arne Laucht says the breakthrough will enable researchers to build more reliable quantum computers. He notes they will be able to work with the same fabrication process used for today's computers.
The new quantum bit consists of the spin of a single atom in silicon merged with an electromagnetic field, known as "dressed qubit." The new dressed qubit can be controlled in a variety of ways that would be impractical with an "undressed qubit," Laucht says.
"We have now implemented a new way to encode the information: we have subjected the atom to a very strong, continuously oscillating electromagnetic field at microwave frequencies, and thus we have 'redefined' the quantum bit as the orientation of the spin with respect to the microwave field," notes UNSW professor Andrea Morello.
From UNSW Newsroom
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