Quantum computer works with more than zero and one

Quantum computer works with more than zero and one

Quantum computer works with more than zero and one

Innsbruck’s quantum computer stores information in individual trapped calcium atoms, each of which has eight states, of which the researchers have used up to seven for calculation. Credit: Uni Innsbruck/Harald Ritsch

We all learn from an early age that computers work with zeros and ones, also known as binary information. This approach has been so successful that computers now power everything from coffee machines to self-driving cars, and it’s hard to imagine life without them.

Building on this success, today’s quantum computers are also designed with binary information processing in mind. “However, the building blocks of quantum computers are more than just zeros and ones,” explains Martin Ringbauer, an experimental physicist from Innsbruck, Austria. “Limit them to binary systems prevents these devices from living up to their true potential.”

The team led by Thomas Monz at the Department of Experimental Physics at the University of Innsbruck has now succeeded in developing a quantum computer that can perform arbitrary calculations with so-called quantum numbers (qudits) and thereby unlock more computing power with fewer quantum particles. Their study is published in Natural physics.

Quantum systems are different

Although storing information in zeros and ones is not the most efficient way to do calculations, it is the easiest way. Simple often also means reliable and robust, so binary information has become the undisputed standard for classic computers.

In the quantum world, the situation is completely different. In the Innsbruck quantum computer, for example, information is stored in individual trapped calcium atoms. Each of these atoms naturally has eight different states, of which usually only two are used to store information. In fact, almost all existing quantum computers have access to more quantum states than they use for computation.

Quantum computer works with more than zero and one

Quantum physicist Martin Ringbauer in his lab. Credit: Uni Innsbruck

A natural approach to hardware and software

The physicists from Innsbruck have now developed a quantum computer that can exploit the full potential of these atoms, by calculating with qudits. Contrary to the classical case, using more states does not make the computer less reliable. “Quantum systems naturally have more than just two states and we showed that we can control them all equally well,” says Thomas Monz.

On the other hand, many of the tasks that require quantum computers, such as problems in physics, chemistry or materials science, is also naturally expressed in the qudit language. Rewriting them for qubits can often make them too complicated for today’s quantum computers. “Working with more than zeros and ones is very natural not only for the quantum computer but also for its applications, allowing us to unlock the true potential of quantum system“, explains Martin Ringbauer.

Error-free quantum computing becomes real

More information:
Martin Ringbauer, A universal qudit quantum processor with trapped ions, Natural physics (2022). DOI: 10.1038/s41567-022-01658-0. www.nature.com/articles/s41567-022-01658-0

Quote: Quantum computer works with more than zero and one (2022, July 21) retrieved July 21, 2022 from https://phys.org/news/2022-07-quantum.html

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