Japanese telecom giant NTT is concerned with more than routing phone calls — it is exploring the technology to enable a new kind of super-fast communication based on quantum mechanics. NTT’s recent experiments with quantum entanglement have reached a true milestone in the understanding of this phenomenon. A team led by Takahiro Inagaki at the NTT Basic Research Laboratories in Kanagawa has managed to keep two particles entangled over a distance of 300 kilometers through fiber optic cable.
Entanglement has been of huge interest to physicists over the years for its ability to seemingly transfer information simultaneously from one location to the other without actually crossing the space in between. Two particles that are entangled share the same quantum state, describing properties like spin, momentum, and polarization. Thus, observing one of the particles tells you about the other.
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