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Diamond quantum memory can change the color of single photon
Aug 04, 2018

The National Research Council of Canada and the Institute of Quantum Computation at the University of Waterloo used a quantum memory in diamond to achieve the conversion of ultra-fast single-photon color and bandwidth for the first time.


Changing the color or frequency of a photon is a necessary condition for optimizing the connected components in a quantum network. For example, in optical quantum communication, the best transmission through fiber optics is NIR, but many measurement sensors work better under higher-frequency visible light conditions. Changing the color of the photons between the fiber and the sensor enables higher performance operations, including faster data transfer rates.


This research, published in Nature Transmission, shows that small frequency shifts are useful for wavelength division multiplexing communication protocols. Wavelength division multiplexing decomposes the signal into smaller packets of slightly different frequencies and transmits them together, and then recovers the carriers of the various frequencies back to the original signal at the receiving end.filling compound for optical fiber cable


The researchers demonstrated in experiments that single-photon frequency and bandwidth conversion can be achieved in a room temperature diamond quantum memory. The working principle of diamond quantum memory is that the conversion of photons into specific vibrations of carbon atoms in diamonds, suitable for this conversion of many different color lights, will allow for broad spectrum manipulation of light. The energy structure of the diamond allows it to be achieved at room temperature with very low noise. Researchers use strong laser pulses to store and retrieve photons. By controlling the color of these laser pulses, the researchers can control the color of the photons they want to retrieve.communication cable filler


The platform integrates photon storage and spectral transformation, and can be used for frequency reuse in quantum communication and to establish a very large entangled state, also known as cluster state. The cluster state can be used as a quantum computing resource driven entirely by measurement.insulating filling gel for cable


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