The first programmable optical quantum memory was developed by researchers from Paderborn University and Ulm University in Germany. The new technology works like an entangled "assembly line", in which the entangled photon pairs are created sequentially and combined with the stored photons. The research was published in the latest issue of Physical Review Letters as an "editor's recommendation". This year, the Nobel Prize in Physics was awarded to three scientists who have made important contributions to quantum entanglement experiments. Quantum entanglement refers to two or more particles in an entangled state in quantum mechanics. Even if they are separated for a long distance, some states will behave as a whole. Entanglement systems that can contain multiple quantum particles have significant advantages in implementing quantum algorithms, which may be used for communication, data security or quantum computing. But before, trying to entangle more than two particles would only lead to very inefficient entanglement. In some cases, if researchers want to connect two particles with other particles, they need to wait a long time, because the interconnection that promotes this entanglement only works with limited probability. This means that once the next suitable particle arrives, photons will no longer be part of the experiment, because storing quantum bit states represents a major experimental challenge. The researcher explained: "We have now developed a programmable optical buffered quantum memory, which can dynamically switch back and forth between different modes - storage mode, interference mode and final release mode." In the experimental setup, a small quantum state can be stored until another state is generated, and then the two can be entangled. This allows a large, entangled quantum state to "grow" particle by particle. The research team used this method to entangle 4 and 6 particles, making it more efficient than any previous experiment, and the success rate was 9 times and 35 times higher than that of traditional methods respectively. The researcher explained: "Our system allows us to gradually build larger and larger entangled states - which is faster, more reliable and more effective than any previous method. For us, this represents a milestone, making us closer to the practical application of large entangled states of useful quantum technology." The new method can be combined with all common photon pair sources, which means that with this method, scientists in other fields can also get help. [Editor in Chief Circle] Because of this year's Nobel Prize in Physics, the concept of quantum entanglement has also become popular among the general public. This ghostly action at a distance can be not only observed, but also prepared. Since the rise of quantum information research, the realization of multiparticle quantum entanglement has been one of the pursuits of quantum physics experimental research. Previously, Chinese scientists have also made many achievements in this field. This paper introduces an experimental device, which can "grow" entangled quantum relatively quickly and form multiple quantum entangled states. The realization of larger quantum entanglement can lay a solid foundation for the stable preservation, transmission and manipulation of quantum, and the realization of quantum computing and quantum communication in the future. (Liu Xinshe)
Edit：Li Jialang Responsible editor：Mu Mu
Source：chinanews.com
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