The global race towards a functioning quantum computer is on. With future quantum computers, we will be able to solve previously impossible problems and develop, for example, complex medicines, fertilizers, or artificial intelligence.
The research results published today in the scientific journal, Nature Communications, suggest how harmful errors in quantum computing can be removed. This is a new twist towards a functioning quantum computer.
Even a quantum computer needs cooling fins
How quantum computers differ from the computers that we use is that instead of computing using normal bits, they use quantum bits, or qubits. The bits being crunched in your laptop are either zeros or ones, whereas a qubit can exist simultaneously in both states. This versatility of qubits is a needed for complex computing, but it also makes them sensitive to external perturbations.
Just like ordinary processors, a quantum computer also needs a cooling mechanism. In the future, thousands or even millions of logical qubits may be simultaneously used in computation, and in order to obtain the correct result, every qubit has to be reset in the beginning of the computation. If the qubits are too hot, they cannot be initialized because they are switching between different states too much. This is the problem Mikko Möttönen and his group have developed a solution to.
A refrigerator makes quantum devices more reliable
The nanoscale refrigerator developed by the research group at Aalto University solves a massive challenge: with its help, most electrical quantum devices can be initialized quickly. The devices thus become more powerful and reliable.
“I have worked on this gadget for five years and it finally works!” rejoices Kuan Yen Tan, who works as a postdoctoral researcher in Möttönen’s group.
Tan cooled down a qubit-like superconducting resonator utilizing the tunnelling of single electrons through a two-nanometer-thick insulator. He gave the electrons slightly too little energy from an external voltage source than what is needed for direct tunnelling. Therefore, the electron captures the missing energy required for tunnelling from the nearby quantum device, and hence the device loses energy and cools down. The cooling can be switched off by adjusting the external voltage to zero. Then, even the energy available from the quantum device is not enough to push the electron through the insulator.
“Our refrigerator keeps quanta in order,” Mikko Möttönen sums up.
Next, the group plans to cool actual quantum bits in addition to resonators. The researchers also want to lower the minimum temperature achievable with the refrigerator and make its on/off switch super fast.
Artistic impression of the quantum-circuit refrigerator in action. As an electron tunnels, it simultaneously captures a photon from a quantum device, which leads to cooling of the device. Image: Heikka Valja
Watch the quantum physicists explain the operating principle of the refrigerator in two minutes using a sledge and a hole in the ice.
Learn more: Refrigerator for quantum computers discovered
The Latest on: Quantum computing
- Microsoft and Brilliant collaborate to launch interactive course on quantum computing on May 24, 2019 at 2:36 pm
Nearing the end of 2017, Microsoft released the first public preview of its Quantum Development Kit (QDK) for Windows, later announcing support for Linux and macOS. Although the tech giant believes ... […]
- IBM VP says quantum computer commercialization coming in next 3-5 years on May 24, 2019 at 10:40 am
Forward-looking: On Wednesday during the opening keynote at the IBM Think Summit in Taipei, Global Vice President and Director of IBM Research in Tokyo Norishige Morimoto stated that the company was ... […]
- D-Wave Takes Another Step On The Path To Broader Quantum Computing Commercialization on May 24, 2019 at 9:41 am
Canadian quantum computer company D-Wave is making a newer, less noisy version of its 2000Q quantum processor available for the customers of its cloud service, Leap. The previous version of its 2000Q ... […]
- Is Quantum Computing the Answer to Future Data Center Innovation? on May 24, 2019 at 9:21 am
BROOMFIELD, Colo. – Quantum computing remains outside of the traditional landscape when it comes to data centers and software-defined networks, but that gap could be closing. Speaking during a keynote ... […]
- Video: The First Catalan Quantum Computer on May 24, 2019 at 7:50 am
In this video from the 2018 BSC Annual Meeting, Pol Forn from the Barcelona Supercomputing Centre describes the QUANTIC group efforts to build the first Catalan quantum computer using superconducting ... […]
via Google News and Bing News