Reports say that China has recorded a breakthrough in a satellite technology that could be used to deliver secure messages.
According to Reuters,
a Chinese quantum satellite dispatched transmissions over a distance
of 1,200 km (746 miles), a dozen times further than the previous record.
China launched the world’s first quantum satellite last August, to
help establish “hack proof” communications between space and the ground,
state media said at the time.
The feat opens up “bright prospects” for quantum communications, said
Pan Jianwei, the lead scientist of the Chinese team, Quantum
Experiments at Space Scale (QUESS), according to the official Xinhua
news agency.
The scientists exploited the phenomenon of quantum entanglement, in
which a particle can affect a far-off twin instantly, somehow overcoming
the long distance separating them, a situation termed “spooky action at
a distance” by the Nobel-prize winning physicist Albert Einstein,
Xinhua added.
The team had successfully distributed entangled photon pairs over
1,200 km, it said, outstripping the distance of up to 100 km (62 miles)
at which entanglement had previously been achieved.
The technology so far is “the only way to establish secure keys
between two distant locations on earth without relying on trustful
relay,” Pan told Xinhua, referring to encrypted messages.
The new development “illustrates the possibility of a future global
quantum communication network” the journal Science, which published the
results of the Chinese team, said on its website.
China still lags behind the United States and Russia in space
technology, although President Xi Jinping has prioritized advancing its
space program, citing national security and defense.
China insists its space program is for peaceful purposes, but the
U.S. Defense Department has highlighted its increasing space
capabilities, saying it was pursuing activities aimed at preventing
adversaries from using space-based assets in a crisis.
China’s launch of the first experimental quantum satellite was a
“notable advance in cryptography research”, the Pentagon said this
month.
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