Nov 30, 2023

MIT Researchers Develop Quantum Repeaters Using Defects in Diamond

Quantum repeaters are essential components for building quantum networks, which have the potential to revolutionize communication, computation, and sensing. Quantum repeaters can amplify and purify quantum signals, enabling them to travel long distances without losing their quantum properties.

In a new study, researchers at MIT have developed quantum repeaters using defects in diamond. These defects, known as nitrogen-vacancy (NV) centers, are tiny imperfections in the diamond lattice that can store and manipulate quantum information.

The MIT researchers’ quantum repeaters use NV centers to entangle photons, which are particles of light. Entanglement is a quantum phenomenon in which two or more particles become linked in such a way that they share the same fate. This means that measuring the state of one entangled particle instantly reveals the state of the others, even if they are separated by a large distance.

By using NV centers to entangle photons, the MIT researchers have been able to create a quantum repeater that can amplify and purify quantum signals with a fidelity of over 99%. This is a significant improvement over previous quantum repeaters, which have had fidelities of around 80%.

The MIT researchers’ quantum repeaters are a major step forward in the development of quantum networks. With further development, these repeaters could be used to build a global quantum network that would enable secure communication, ultra-fast computing, and precise measurements.

Here are some of the key points of the MIT research:

  • The researchers used NV centers in diamond to entangle photons.
  • The quantum repeaters they developed have a fidelity of over 99%.
  • This is a significant improvement over previous quantum repeaters.
  • The researchers’ quantum repeaters are a major step forward in the development of quantum networks.

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