NTT, in partnership with Japan's National Institute of Informatics and Osaka University, announced a new approach in the development of a long-lived quantum memory that could be used in quantum computing.
The research involves a superconductor diamond quantum hybrid system in which a dark state was shown to be 150 ns, an order of magnitude longer than previous attempts to hold state. By using a gap-tunable superconducting flux qubit, the researchers were able to change the energy without decreasing the lifetime of the memory.
The company said this innovation facilitates the precise synchronization of photons, thereby creating a buffer that could be used to create quantum computers. Experiments have shown that the buffer can slow down the speed of pulsed photons to 1/60 of the speed of light in vacuum while faithfully preserving its quantum state. The device used for this demonstration was created by NTT Basic Research Laboratories fabricated by coupling nanocavities with a total length of 840 μm using a silicon photonic crystal.
The research was published in the UK science journal “Nature Communications”.