A step towards silicon-based quantum computer

UNSW researchers have proposed a new way to distinguish between quantum bits that are placed only a few nanometres apart in a silicon chip, taking them a step closer to the construction of a large-scale quantum computer.

Quantum bits, or qubits, are the basic building blocks of quantum computers - ultrapowerful devices that will offer enormous advantages for solving complex problems.

A qubit based on the spin of an individual electron bound to a phosphorus atom within a silicon chip is one of the most promising systems for building a practical quantum computer, due to silicon’s widespread use in the microelectronics industry, said Professor Michelle Simmons, leader of the research team.

“However, to be able to couple electron-spins on single atom qubits,  the qubits need to be placed with atomic precision, within just a few tens of nanometres of each other,” she says. “This poses a technical problem in how to make them, and an operational problem in how to control them independently when they are so close together.”

The UNSW team, in collaboration with theorists at Sandia National Laboratories in New Mexico, has found a solution to both these problems. Their study is published in the journal Nature Communications. In a significant feat of atomic engineering, they were able to read out the spins of individual electrons on a cluster of phosphorus atoms that had been placed precisely in silicon. They also propose a new method for distinguishing between neighbouring qubits that are only a few nanometres apart.

“It is a daunting challenge to rotate the spin of each qubit individually,” says Holger Büch, lead author of the new study. “But if each electron is hosted by a different number of phosphorus atoms, then the qubits will respond to different electromagnetic fields - and each qubit can be distinguished from the others around it,” he says.

The UNSW team is part of the Sydney-headquartered Australian Centre of Excellence for Quantum Computation and Communication Technology. “This first demonstration that we can maintain long spin lifetimes of electrons on multidonor systems is very powerful. It offers a new method for addressing individual qubits, putting us one step closer to realising a practical, large-scale quantum computer.”

To make the tiny device, the researchers deposited a layer of hydrogen on a silicon wafer and used a scanning tunnelling microscope to create a pattern on the surface in an ultrahigh vacuum. This was then exposed to phosphine gas and annealed at 350° so phosphorus atoms became incorporated precisely into the silicon. The device was then buried in another layer of silicon.

In a quantum computer, information is stored in the spin, or magnetic orientation, of an electron. This spin can not only be in the two ‘classical’ states - up and down - but also in a combination of both states at the same time, allowing exponentially larger amounts of information to be stored and processed in parallel.