Two-qubit gate: the speediest quantum operation yet

phys.org | 3/1/2018 | Staff
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A group of scientists led by 2018 Australian of the Year Professor Michelle Simmons have achieved the first two-qubit gate between atom qubits in silicon—a major milestone on the team's quest to build an atom-scale quantum computer. The pivotal piece of research was published today in world-renowned journal Nature.

A two-qubit gate is the central building block of any quantum computer—and the UNSW team's version of it is the fastest that's ever been demonstrated in silicon, completing an operation in 0.8 nanoseconds, which is ~200 times faster than other existing spin-based two-qubit gates.

Simmons - Group - Approach - Gate - Operation

In the Simmons' group approach, a two-qubit gate is an operation between two electron spins—comparable to the role that classical logic gates play in conventional electronics. For the first time, the team was able to build a two-qubit gate by placing two atom qubits closer together than ever before, and then—in real-time—controllably observing and measuring their spin states.

The team's unique approach to quantum computing requires not only the placement of individual atom qubits in silicon but all the associated circuitry to initialise, control and read-out the qubits at the nanoscale—a concept that requires such exquisite precision it was long thought to be impossible. But with this major milestone, the team is now positioned to translate their technology into scalable processors.

Professor - Simmons - Director - Centre - Excellence

Professor Simmons, Director of the Centre of Excellence for Quantum Computation and Communication Technology (CQC2T) and founder of Silicon Quantum Computing Pty Ltd., says the past decade of previous results perfectly set the team up to shift the boundaries of what's thought to be "humanly possible".

"Atom qubits hold the world record for the longest coherence times of a qubit in silicon with the highest fidelities," she says. "Using our unique fabrication technologies, we have already demonstrated the ability to read and initialise single electron spins on atom qubits in silicon...
(Excerpt) Read more at: phys.org
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