Created «impossible» material control systems quantum computers

© Press service of the nust «MISIS»Engineer of laboratory «Superconducting metamaterials» nust «MISIS» Ilya BesedinCreated «impossible» material control systems quantum computers© Press service of the nust «MISIS»

An international team of Russian and German researchers made a breakthrough in the creation of materials that possess unattainable in the nature of properties. Scientists of the National research technological University «MISIS», University of Karlsruhe (Germany) and Jena Institute of photonic technology (Germany) under the supervision of the head of laboratory «Superconducting metamaterials» nust MISIS, Professor Alexei Ustinov for the first time in the world created the so-called «mirror» qubits, and metamaterial based on them. The world’s first quantum metamaterial, which can be used as a control in superconducting electrical circuits. The results published in the journal «Nature Communications”.

Metamaterials are substances whose properties are determined not so much by the atoms of which they consist, but in what structures those atoms are arranged. Each such structure (they are called «meta-atom”) is in the hundreds tens or even hundreds of nanometers and has its own set of properties, which disappears when you try to divide it into components.

Until recently, one of the fundamental differences of atoms from meta-atoms consisted in the fact that the properties of conventional atoms is described by the equations of quantum mechanics, and the meta-atoms, classical physical equations.

Create a qubit (the smallest unit of information storage in a quantum computer) has resulted in the potential to construct a material composed of meta-atoms, whose state is described only quantum mechanical. However, this work required the creation of special qubits.

«The usual qubit consists of a schema, which includes three posesorski transition, – says researcher of laboratory «Superconducting metamaterials» nust «MISIS» Kirill Shulga. – And the mirror is composed of five transitions, symmetric relative to the Central axis. Mirror qubits to serve as a more complex system than the conventional superconducting qubits. The logic is simple: artificially complicated systems with many degrees of freedom there is a greater number of factors that can influence its properties. Changing some external parameters of the environment, which is our metamaterial, it is possible these properties to turn on and off, turning the mirror of one qubit from the ground state with the same properties in the other.»

During the experiment it turned out that the whole metamaterial consisting of a mirror qubits can switch between the two modes. One of the modes of the chain of qubits very well transmit electromagnetic radiation in the microwave range while being a quantum element. In another she turns to the superconducting phase by 180 degrees and locks the electromagnetic waves pass through itself. It is important that it stays a quantum system.

To accurately calculate the properties of one mirror of a qubit on a standard computer more difficult than usual qubit. Complicating this qubit back in a few times, you can reach the limit of complexity already close to or surpassing the capabilities of modern electronic computers. Such a complex system can be used as a quantum simulator, i.e. a device that can predict and simulate properties of a certain real process or material.

The study authors had to sort through a lot of theories to correctly describe the processes occurring in a quantum meta-material. The result of reflections was the article, «off volume control dimension induced transparency of a quantum metamaterial composed of twin flux qubits”, published in the prestigious journal «Nature Communications”.