Researchers generate quantum entanglement between remote locations based on quantum teleportation. Source: Yokohama National University, Japan Defects in diamonds, that is, atomic defects in which carbon is replaced by nitrogen or other elements, may provide a nearly perfect interface for quantum computing. However, these defects called diamond nitrogen vacancy centers are controlled by magnetic field, which is incompatible with existing quantum devices. Japanese researchers have developed an interface method to control diamond nitrogen vacancy centers by allowing direct conversion to quantum devices. The research results were published in communication physics on the 15th. The corresponding author of the paper and professor of the quantum information research center of the Institute of advanced science of Yokohama National University and the Department of physics of the Graduate School of engineering, said that in order to realize the quantum Internet, a quantum interface is needed to generate the long-range quantum entanglement of photons. Photons are a kind of quantum communication medium. In the quantum Internet, researchers determine that photons are both particles and light waves, and their wave states can reveal information about their particle states, and vice versa. More importantly, the two states can affect each other, and the squeezing wave may frustrate the particles. Their essence is tangled, even if they are far apart. The purpose is to control entanglement for real-time and secure transmission of discrete data. Kosaka said that previous studies have shown that this controlled entanglement can be achieved by applying a magnetic field to the nitrogen vacancy center, but a non magnetic field method is needed to be closer to the realization of the quantum Internet. The research team successfully used microwave and optical polarization waves to entangle the emitted photons and left spin qubits, which is the quantum equivalent of information bits in classical systems. These polarizations are waves moving perpendicular to the original source, just like seismic waves radiated horizontally from vertical fault displacement. In quantum mechanics, the spin properties of photons (right-handed or left-handed) determine how the polarization moves, which means that it is predictable and controllable. Crucially, according to Osaka, when entanglement is caused by this property in a non magnetic field, this connection seems to be stable for other variables. The geometric properties of polarization enable researchers to produce long-range quantum entanglement with elasticity to noise and time error. The research team combined this method with the previously demonstrated quantum information transmission through teleportation to generate quantum entanglement and the resulting information exchange between remote locations. Kosaka said that the ultimate goal of the research is to promote the interconnection of quantum computer networks to establish the quantum Internet. (Xinhua News Agency)
Edit：Li Ling Responsible editor：Chen Jie
Source：Science and Technology Daily
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