Researchers have developed a new method for processing diamonds that facilitates the inspection and production of arrays of structural defects in the crystal lattice..
Quantum computers are a promising direction in the development of information technology and communications. However, their main problem is «fragility» the necessary quantum states of particles, which can support only a few physical systems for a sufficiently long time and stably. These include atomic defects in materials such as diamonds, but the lack of technology to make them limits progress..
A team of scientists from Oxford University recently unveiled a new method for creating crystal defects in diamonds (nitrogen vacancy color centers) by focusing a sequence of ultrafast laser pulses. It uses a sensitive fluorescent monitor to detect light emitted from the focal area, allowing active monitoring of the process in response to the observed signal..
By combining local control and feedback, the method facilitates the production of arrays from single AV centers at each point and allows precise control of their location. This is a key factor for technology scalability and integrated device design. The fast, one-step process is easy to automate, so it takes seconds to create each nitrogen vacancy center.
Laser recording of individual defects in diamond with a yield close to unity.
Scientists expect that the proposed method will be used to fabricate centimeter-sized diamond chips containing 100 thousand or more AV centers, which will create a universal fault-tolerant quantum computer.
We also recently announced a new record quantum memory efficiency.
text: Ilya Bauer, photo: Oxford University, firstoptical
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