Researchers implement entanglement swapping with independent sources over 100km optical fiber

phys.org | 10/12/2017 | Staff
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A group of scientists led by Prof. Zhang Qiang and Pan Jianwei from the University of Science and Technology of China (USTC) have successfully demonstrated entanglement swapping with two independent sources 12.5 km apart using 103 km optical fiber.

Realizing long-distance entanglement swapping with independent sources under real-world conditions is important for both future quantum networks and the fundamental study of quantum theory.

Susceptibility - Effects - Demonstration - Principle - Tens

However, due to its high susceptibility to environmental effects, demonstration of the principle had previously been achieved over only a few tens of kilometers of underground optical fiber, and there had been no report of implementation using optical fiber longer than 100 km or using suspended optical fiber.

To increase the experimental distance, USTC scientists exploited two independent 1 GHz-clock sequential time-bin entangled photon-pair sources, developed several automatic stability controls, and successfully implemented a field test of entanglement swapping over a 103 km optical fiber link composed of about 77 km of optical fiber inside the lab, 25 km of optical fiber outside the lab but kept underground, and 1 km of optical fiber suspended in the air outside the lab to account for various types of noise mechanisms in the real world.

Team - Length - Fiber - Distance - Inter-city

The team has increased the length of optical fiber from metropolitan distance to inter-city distance. It is worth noting that suspended optical fiber was used in the experiment. The loss and stability of the optical fiber...
(Excerpt) Read more at: phys.org
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