Which country has launched the world’s longest super-secure quantum communication line?

Which country has launched the world’s longest super-secure quantum communication line?
[A]New Zealand
[B]China
[C]Japan
[D]South Korea

China
China has launched the world’s longest super-secure quantum communication line to safely transmit sensitive information. The new 712 km quantum communication line links Hefei, capital of Anhui province, to Shanghai, the country’s financial hub. It is part of a 2,000-km quantum communication line connecting Beijing and Shanghai.

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