Cologne physicists discover a new super -leading effect for quantum computers!

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Köln, Deutschland - Research in the area of ​​quantum computers has made significant progress. Physicists from the University of Cologne have discovered a superconductive effect in nano wires from topological isolators, which is considered decisive for the future of stable quantum bits (qubits). The results were published in the specialist magazine "Nature Physics", and the proof of the crossed Andreev reflection (Crossed Andreev Reflection-Car) is an important step in the development of this technology. The title of the study is "Long-Range Crossed Andreev Reflection in Topological Insulator NanOwires Proximitized by a SuperConductor" and was made by Dr. Junya Feng and Professor Dr. Yoichi Ando carried out. The study was written in cooperation with the University of Basel.

Topological isolators (Ti) have established themselves as a promising basis for robust quantum bits based on majorana fermions. Current qubit technologies are often unstable and prone to errors. A new method for the production of nano wires made of topological insulators was developed by Junya Feng, which creates a cleaner structure and enables inducing superconductive correlations in these nano wires. These correlations are essential for the creation and control of majorana fancies that form the basis for the new quantum bits.

challenges and possibilities

A central problem in the development of quantum computers is instability of existing technologies. Current qubit approaches fight with error rates that severely restrict the performance of quantum computers. With the discovery of the crossed Andreev reflection, however, there is a promising way to improve this hit rate. Here, an electron injected in the nano wire with another, to form a superconductive Cooper couple, which creates a far-reaching superconductive correlation.

In addition to the progress of the Cologne physicists, Microsoft recently introduced Majorana 1, the world's first quantum processor that is based on topological qubits. This processor is designed in such a way that it enables the scaling to up to a million qubits on a single chip. The associated technology uses a combination of indium arsenide, a semiconductor, and aluminum, a superconductor to form topological superceptual nano wires with majora modes (MZMS). MZMS serve to store quantum mechanical information and could revolutionize quantum processing.

The way to error correction

In the first measurements of the Majorana 1 processor, an error rate of only 1 % was found, with the aim of further reducing this number. The system shows remarkable stability, with external energy disorders rarely influence the qubit states. Microsoft plans to realize an error-resistant quantum computing prototype in the coming years and is actively working on a new backend that simplifies the error correction through digital pulses. With the development of a tertron, a single-qubit-based device, the next step in the roadmap is sought for an error-tolerant quantum calculation.

Together, the developments of the University of Cologne and Microsoft's university show that topological quantum computers have the potential to significantly improve quantum information processing, which promises far -reaching impulses for areas such as materials science, agriculture and chemical discoveries. The challenges in the current state of quantum computing technology could be significantly reduced by these new approaches.

researchers and developers worldwide are looking forward to the progress in quantum computing technology, while the significant work of the Excellence Cluster "Matter and Light for Quantum Information" (ML4Q) in Cologne, as well as the groundbreaking developments at Microsoft open new horizons.

Further information can be found in the studies at University of Cologne href = "https://pubmed.ncbi.nlm.nih.gov/19792336/"> pubmed , as well as the latest developments at Microsoft on their blog DetailsOrtKöln, DeutschlandQuellen