American and Austrian scientists said in the latest issue of Science that they observed quantum entanglement between billions of flowing electrons in quantum critical materials, which is the most powerful direct evidence to date that entanglement leads to quantum criticality. It is expected to promote the development of quantum information and superconducting technology.
According to the physicist organization network reported on the 16th, in the latest study, scientists examined the electromagnetic behavior of the material YbRh2Si2 composed of ytterbium, rhodium, and silicon when approaching and crossing the critical point of two quantum phases, and found the number Quantum entanglement between one billion flowing electrons. Research collaborator, Rice University's Schimiao said that this is by far the strongest direct evidence of quantum criticality caused by entanglement.
To make ultra-pure YbRh2Si2 thin films, researchers at the Vienna University of Technology have developed a very complex material synthesis technology. When it is close to absolute zero, the material can undergo a phase change, from a quantum phase forming a magnetic sequence to a "quantity" to a quantum phase not forming a magnetic sequence. Subsequently, Li Xinwei of Rice University conducted a terahertz spectroscopy experiment on the film at minus 271.75 degrees Celsius, revealing the light guide when the YbRh2Si2 film was cooled to a quantum critical point.
Smiao said: "At the quantum critical point, the traditional view is that only the spin part is the critical point. But if quantum entanglement occurs between the charge part and the spin part, then the charge part also becomes crucial. In the latest research , We detected the charge part at the magnetic quantum critical point and found new evidence that the quantum entanglement leading to quantum criticality is very direct. "
Simiao is the director of the Rice University Quantum Materials Center. He pointed out that quantum entanglement is the basis for storing and processing quantum information. At the same time, scientists believe that quantum criticality can lead to high temperature superconductivity. Therefore, the latest research can provide a platform for quantum information and high-temperature superconducting technology, promote the development of these two technologies, and open the door to new technologies in the fields of computing and communications.