Two-dimensional materials can store quantum information at room temperature

Artistic representation of isolated spins on hexagonal boron nitride under a light microscope Credit: Qiushi Gu

Researchers have identified two-dimensional materials that can be used to store quantum information at room temperature.

Quantum memory is a major component to be addressed in the construction of the quantum Internet. Quantum information Is stored securely and is transmitted via photons or particles of light.

Researchers at the Cavendish Laboratory at the University of Cambridge, in collaboration with colleagues at UT Sydney, Australia, Two-dimensional material, Hexagonal boron nitrideAt room temperature, a single photon can be emitted from an atomic-scale defect in its structure.

Researchers have discovered that the light emitted by these isolated defects provides information about quantum properties that can be used to store quantum information called spins. This means that this material may be useful for quantum applications. Importantly, quantum spins can be accessed at room temperature via light.

Ultimately, this discovery has the potential to support scalable quantum networks built from two-dimensional materials that can operate at room temperature.Results will be reported to the journal Nature Communications..

Future communication networks will use a single photon to send messages around the world. This will enable more secure global communication technology.

Computers and networks built on the principles of quantum mechanics are far more powerful and secure than current technology. However, to enable such networks, researchers need to develop reliable ways to generate a single indistinguishable photon as a carrier of information across quantum networks.

“You can use photons to send information from one place to another, but if you want to build a real quantum network, you need to send, store, and send the information to another place.” Dr. Hannah Stern of the Cavendish Laboratory in Cambridge said. She is the co-lead author of this study, along with Qiushi Gu and Dr. John Jarman. “We need materials that can hold quantum information for a period of time at room temperature, but most of the material platforms we have today are difficult to manufacture and only work at low temperatures.”

Hexagonal boron nitride is a two-dimensional material that grows by chemical vapor deposition in a large reactor. It’s cheap and scalable. Recent efforts have revealed the existence of a single photon emitter and a dense population of optically accessible spins, but the separate spin-photon interface operating under ambient conditions There is none.

“Usually it’s a pretty boring material that’s usually used as an insulator,” said Stern, a Junior Research Fellow at Trinity College. “But it turns out that this material has defects that can be released. Single photonThis means it can be used in Quantum system.. If quantum information can be stored in spins, it is a scalable platform. “

Stern and her colleagues installed a hexagonal boron nitride sample near a small gold antenna and a magnet of set intensity.By firing a laser at a sample in the room temperatureThey were able to observe many different magnetic field dependent responses to the light emitted from the material.

Researchers have discovered that when a material is lasered, the defect can be used as a way to manipulate the spin or inherent angular momentum of the defect and store quantum information.

“Usually, the signal is always the same in these systems, but in this case the signal changes depending on the particular defect you are investigating, and not all defects represent the signal, so there is still something to discover. There are many. ” Co-lead author Qiushi Gu. “There are many variations across the material, like a blanket hung on a moving surface. There are many ripples, but they are all different.”

Professor Mete Atature, who oversaw the work, added: room temperature In this article, the next step is to understand their photophysics in detail, Possible applications Includes information storage and quantum sensing. Following this task is a fun physics stream. ”

Physicists describe the properties of photons to protect future quantum computing

For more information:
Hannah L. Stern et al, Room Temperature Optical Detection of Single Defects of Hexagonal Boron Nitride, Nature Communications (2022). DOI: 10.1038 / s41467-022-28169-z

Quote: The 2D material is the room temperature obtained from on February 11, 2022 (February 2022). Quantum information can be saved in 11 days).

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Two-dimensional materials can store quantum information at room temperature

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