Physicists have built a record long microwave quantum communication

Swiss physicists have implemented a coherent link between two quantum systems using cooled microwave waveguide. Cable length was 5 meters — previously, scientists could not associate a superconducting quantum systems at a distance without losing coherence. Demonstrate the system can be used to create quantum computational clusters. Work presented at the conference Virtual APS Meeting (the annual conference of the APS Meeting in Denver cancelled due to coronavirus).

In recent years there has been a huge leap in the field of quantum computing scientists have learned to control large quantum machines that can perform calculations that are inaccessible to classical supercomputers. However, because of the large errors that occur when working with qubits, quantum computers are still far from ideal calculations.

One of the most promising computing devices — a superconducting quantum computer, it runs at a very low temperature of about 10 millikelvin. To create such temperatures physicists use refrigerators dissolve in liquid helium mixture. Unfortunately, to date, one such refrigerator can not be placed more than a few hundred qubits, therefore, to create really big universal quantum computer, you need to learn how to connect two refrigerated.

A group of physicists from ETH Zurich under the supervision of Professor Wallraf-Richartz Andreas (Andreas Wallraff) has two connected superconducting chip, each of which was in a separate refrigerator, with a microwave resonator (waveguide) length of 5 meters. For the transmission of information between the chips answered microwave photons propagating along the waveguide.

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