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Scientists gain electrical control of quantum bits, paving the way for quantum computers

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For the first time UNSW, Australia Researchers are not a far away from the discovery of affordable, large
quantum computers, after gaining electrical control of qubits or quantum bits.
The whole team was able for storing quantum data in silicon with the help of  simple electrical pulses, without using pulses of oscillating magnetic
fields. This is the same way that the computers we use today encode
data. We now have the ability for controlling the quantum computers in future cheaply and easily.

“We
demonstrated that a highly coherent qubit, like the spin of a single
phosphorus atom in isotopically enriched silicon, can be controlled
using electric fields, instead of using pulses of oscillating magnetic
fields,” said lead author of the study, Arne Laucht from UNSW Engineering, in a press release.

The Researchers have been attempting for this since 1998, and the results have now been published in the open-access journal Science Advances.

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The method works by distorting the shape of the electron cloud
attached to the phosphorous atom, quantum engineer Andrea Morello, who
also worked on the research, explained in the release.

“This distortion at the atomic level has the effect of modifying the frequency at which the electron responds,” he said.

“Therefore,
we can selectively choose which qubit to operate. It’s a bit like
selecting which radio station we tune to, by turning a simple knob.
Here, the ‘knob’ is the voltage applied to a small electrode placed
above the atom.”
Basically, this research suggests that its possible to control data locally
in a large-scale quantum computers using only inexpensive voltage
generators, as opposed to the pricey high-frequency microwave sources
that quantum researchers have used to encode information in the past.
These types of qubits can also be manufactured using
technology similar to the kind we currently use, which will greatly cut
the cost of quantum computers.
Source: Phys.org

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