Diamond Quantum Memory Can Change Color of Single Photon, Improving Data Transmission Rate

Canada's National Research Council and a quantum computing institute of University of Waterloo make use of a quantum memory in diamonds, realizing the super fast single photon color conversion for the first time.

Changing the color or frequency of a photon, is the necessary condition to optimize quantum network connecting parts. For example, in light quantum communication, the best transmission that can go through optical fiber is near infrared ray, but many measuring sensors will work better in higher frequency and under the condition of visible light. Changing the color of the photons between optical fiber and sensors, can achieve higher performance operations, and faster data transfer rate is also possible.

The results of this research published in the journal Nature Spread, show that the small frequency shift is useful for WDM communication protocol. WDM can pack signals into different frequency smaller package together to send out, and then will recover them on the receiving end.

Researchers in the experiment prove that diamond quantum memory at room temperature can realize frequency and bandwidth conversion of single photon. The working principle of diamond quantum memory is to convert photons into diamond carbon atoms in a particular vibration, which is applicable to many different colors of light. And this conversion will allow broad-spectrum control for light. Diamond energy structure can allow it to realize at a very low noise at room temperature. Researchers use intense laser pulse to store and retrieve the photons. By controlling the color of the laser pulse, researchers can control the photon color.

The platform integrating photon storage and spectrum transform, can be used for the frequency reuse of quantum communication and building a very large entangled state, which is also called cluster state. Cluster state can be regarded as quantum computing resources completely driven by measuring.

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