Tunable diamond strings are expected to be the key to quantum memory
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[Reported by Harvard University website on May 22, 2018] Researchers at the University of Harvard's John A. Paulson School of Engineering and Applied Science (SEAS) and the University of Cambridge in the United Kingdom have developed a new solution to quantum memory. Tunable diamond strings increase the efficiency of quantum memory. Quantum Internet communication has become a new path to develop a secure and fast network, and quantum network transmission requires efficient quantum memory as its core component. Traditional quantum memories are extremely sensitive to the environment, and the vibration of nearby atoms can destroy the ability of quantum memory information. Currently, researchers rely on extremely low temperatures to balance vibrations near atoms, but the cost of achieving low temperatures is prohibitive. To this end, SEAS researchers have taken a different approach, using the impurity effect of the crystal, designed an adjustable diamond string, increasing the quantum memory capacity from tens of nanoseconds to hundreds of nanoseconds, so as to accommodate more operations on the quantum chip. Space, while saving the cost of achieving low temperatures. Impurities in the diamond, which are the vacant center of the silicon vacancies, act as quantum bits. The electrons captured at the center can act as memory storage units and can emit single-photon red light from the center to act as a long-range information carrier for the quantum Internet. But with the random vibration of atoms in the diamond crystal, the central electrons quickly forget the quantum information. To improve the memory of the qubits in the magazine environment, the researchers carved the diamond crystals in the center of the color into a thin line, about 1 micron wide (a hundred times thinner than the hair), and connected the electrodes to either side. By applying a voltage, the diamond string stretches and increases the frequency of the electronically sensitive vibration, just as tightening the guitar strings increases the frequency or pitch of the strings. By adding tension to the strings, the researchers increased the energy range of the electron-sensitive vibrations, which means that the diamond strings can only experience high-energy vibrations. This process effectively transforms the vibrations around the crystal into unrelated background sounds, allowing electrons in the vacancies to hold the information for hundreds of nanoseconds, which is a very long time on a quantum scale. These tunable diamond strings are the key to the future of quantum internet. The research project received the National Science Foundation-funded Quantum Materials Center, the Naval Research Office's Quantum Light Mechanics Multidisciplinary University Research Program, the National Science Foundation's Frontier Research and Innovation Program ACQUIRE, Cambridge University, ERC Consolidator Grant PHOENICS Program Funded by the NQIT program of the EPSRC Quantum Technology Center. Related research papers were published in Nature Communications.