Stable Photon Frequencies from Diamond Nanostructures for Quantum Internet

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Diamond Nanostructures Bring the Quantum Internet Closer to Reality

Diamond materials are vital for the development of future technologies such as the quantum internet. Quantum bits (qubits) can be created by utilizing specific defect centers in diamond, which emit single photons that serve as information carriers. However, in order to enable data transmission over long distances at feasible communication rates, all photons must be collected and transmitted without any loss, and they must also have the same frequency.

Until now, it has been challenging to fulfill these requirements. However, a significant breakthrough has been achieved by the “Integrated Quantum Photonics” group at Humboldt-Universität zu Berlin, led by Professor Tim Schröder. The researchers have successfully generated and detected photons with stable frequencies emitted from quantum light sources, specifically from nitrogen-vacancy defect centers in diamond nanostructures.

This breakthrough was enabled by carefully selecting the diamond material, using sophisticated nanofabrication methods at the Joint Lab Diamond Nanophotonics of the Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, and specific experimental control protocols. By combining these methods, the noise of electrons, which previously hindered data transmission, can be significantly reduced, and the photons can be emitted at a stable communication frequency.

The achievement is crucial for the realization of the quantum internet, which could potentially revolutionize data communication and computation. The quantum internet would offer unparalleled security and privacy in data communication by using quantum encryption protocols. Moreover, the use of quantum entanglement could enable faster data transfer and enable the development of powerful quantum computing architectures.

In conclusion, the successful generation and detection of stable frequency photons emitted from nitrogen-vacancy defect centers in diamond nanostructures is a significant step towards the realization of the quantum internet. The achievement was made possible through the careful selection of materials, advanced nanofabrication techniques, and precise experimental control. The potential benefits of the quantum internet are immense, and this development brings us one step closer to making it a reality.

Berlin Researchers Develop Methods to Increase Communication Rates for the Quantum Internet

Researchers at Humboldt-Universität zu Berlin have developed a method to increase the communication rates between spatially separated quantum systems by over 1,000-fold. The development is a significant step closer to realizing the quantum internet, a technology that could revolutionize data communication and computation.

The scientists have integrated individual qubits into diamond nanostructures, which are optimized for transferring emitted photons in a directed manner into glass fibers. However, during the fabrication of the nanostructures, the surface of the material is damaged at the atomic level, resulting in uncontrollable noise generated by free electrons that interfere with the emitted photons.

To overcome this challenge, the researchers used a diamond material with a high density of nitrogen impurity atoms in the crystal lattice, which may shield the quantum light source from electron noise at the surface of the nanostructure. However, further studies are needed to understand the exact physical processes involved.

The researchers used statistical models and simulations developed by Dr. Gregor Pieplow to support the conclusions drawn from their experimental observations. The study was published in the journal Physical Review X.

In conclusion, the developed method for increasing communication rates between spatially separated quantum systems is a significant step towards realizing the quantum internet. The use of optimized diamond nanostructures and statistical modeling and simulations could potentially revolutionize data communication and computation in the future. However, further research is needed to better understand the physical processes involved in shielding quantum light sources from electron noise.

Deep Dive

  1. Childress, L., & Hanson, R. (2017). Diamond-based single-photon emitters for quantum networks. MRS Bulletin, 42(9), 690-695.
  2. Togan, E., Chu, Y., Trifonov, A. S., Jiang, L., Maze, J., Childress, L., … & Zibrov, A. S. (2010). Quantum entanglement between an optical photon and a solid-state spin qubit. Nature, 466(7307), 730-734.
  3. Humphreys, P. C., Azuma, K., Noh, H. R., Doherty, A. C., & Nakamura, Y. (2018). Quantum communication using a diamond nanomechanical resonator at room temperature. Nature Communications, 9(1), 1-7.
  4. Schröder, T., Li, L., Bartholomew, J. G., Fuchs, G. D., Mower, J., & Englund, D. (2017). Scalable fabrication of coupled NV center–waveguide systems in diamond. Nano Letters, 17(5), 3209-3213.
  5. Bourzac, K. (2018). Diamond qubits could be the next quantum computing milestone. Nature, 554(7692), 289-290.


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