Two quantum nodes were successfully entangled research shows

“In 2020, we published a paper in which we demonstrate the entanglement of two quantum memories via a fiber link of 50 km (164 feet),” said Xiao-Hui Bao, one of the researchers who carried out the study.

“In that experiment, both two memories we used were located within one lab and thus not fully independent. The next step in our research was to make the two memories fully independent while placing a long distance between them.”

Two different nodes were introduced to different locations in the town

In experiments by Bao and colleagues, two different quantum nodes in an urban environment were placed 410 feet (12.5 km) apart. In the first node, dubbed node A, they entangled their first quantum memory with a single photon. This single photon was then sent to node B and stored within the second quantum memory.

“In this way, we entangle the two remote quantum memories,” Bao explained. “Since the photon emitted from our memory is near infrared (795 nm), being not suitable for low-loss transmission in fiber, we make use of the quantum frequency conversion technique to shift the photon’s wavelength to 1342 nm instead, which improves the overall transmission efficiency significantly.”

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