The first quantum hybrid bit is based on topological insulators

The first quantum hybrid bit is based on topological insulators

Chip with hybrid qubits. Photo: Forschungszentrum Jülich / Ralf-Uwe Limbach

With their high properties, topological qubits can contribute to a breakthrough in the development of a quantum computer designed for earth applications. Currently, no one is responsible for clearly demonstrating a quantum bit, or qubit for short, of this nature in a lab. However, scientists from the Forschungszentrum Jülich have come up with a way to accomplish this. For the first time, they succeeded in integrating a topological insulator into a conventional superconducting qubit. Just in time for “World Quantum Day” on April 14, their hybrid qubit story worked to cover the latest issue of the journal. Nano letters.

Quantum computers are thought to be like the computers of the future. Using quantum effects, they promise to provide solutions for complex problems that cannot be solved by conventional computers in a timely manner. However, such computers have been in use for a long time. Modern quantum computers have a small number of qubits. The bigger the problem, the easier it is to make a mistake. The larger the system, the more difficult it is to isolate it from its environment.

So many hopes have been fixed on a new form of quantum bit – the topological qubit. This path is being pursued by several research groups and organizations such as Microsoft. This qubit type exhibits a unique topologically protected feature; The unique geometric properties of superconductors and their unique electrical properties ensure the maintenance of quantum knowledge. Topological qubits are therefore considered to be strong and resistant to external sources of decoherence. They are known to enable fast conversion times similar to those found in conventional superconducting qubits used by Google and IBM in current quantum processes.

However, it is not clear whether we are responsible for actually creating topological qubits. Because there is no reasonable basis for the formation of the specific quasiparticles required for this without a doubt. These quasiparticles are called Majorana states. So far, they can only be demonstrated in theory, but not in experiments. Hybrid qubits, although they were developed for the first time by a research team led by Drs. Peter Schüffelgen at the Peter Grünberg Institute (PGI-9) of Forschungszentrum Jülich, is opening new innovations in this area. They have topological features in important areas. Therefore, this new type of hybrid qubit provides researchers with a new experimental platform to test the nature of topological factors in critical quantum circuits.

Accurate measurement of electrical properties in ultra-thin topological insulators

More information:
Tobias W. Schmitt et al. Nano letters (2022). DOI: 10.1021 / acs.nanolett.1c04055

Presented by Forschungszentrum Juelich

Directions: The first hybrid quantum bit based topological insulators (2022, April 14) downloaded on 15 April 2022 from -topological.html

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