Scientists have figured out how to shrink huge optical quantum processors

The authors of the new work have created an optical isolator on a chip. This element is many times smaller than the one that

used in conventional optical quantum computers.

The essence of the work of an optical isolator is that it prevents the propagation of light in the opposite direction - usually this happens in any media for transporting photons.

If such a process needs to be controlled in a largeinstallation, magneto-optical isolators are usually used. But there is a problem - the chip and strong magnetic fields are incompatible during operation. Researchers have figured out how to get around this. They used sound waves because they can directly affect photons.

Ease of manufacture is key- with our approach, you can print optical isolators that work well for whatever wavelength you need, all on one chip at the same time. This is simply not possible with other approaches.

Ogulkan Orsel, PhD Student, Department of Electrical Engineering, University of Illinois at Urbana-Champaign

As a result, scientists suggested usingring sound resonator with optical waveguides. The light that comes from the laser passes through the resonator area and moves on. If you use such a scheme, then only one out of 10 thousand photons will be reflected back through the fiber. Photons are not absorbed or reflected, but simply pass on.

The result is a solution that can potentially reduce the design of quantum optical processors.

Also, the authors note, their resonator can be made so that it only allows a certain wavelength of light to pass through. This means that such a chip can be fine-tuned already at the production stage.

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