On Sep 3, 2017 11:09 PM, "Kevin O'Malley" <kevmol...@gmail.com> wrote:
> They did. See article below. > > Physicists Demonstrate Record Breaking Long-Distance Quantum > Entanglement in Space > Futurism.com ^ > Posted on 9/2/2017, 8:35:07 PM by TBP > > IN BRIEF > > Chinese physicists managed to demonstrate long-distance quantum > entanglement in space, breaking previous records. This development, > made possible by a novel method, could lead to improved information > storage and transfer in the future. SPOOKY ACTION GETS TO SPACE > > When it comes to weird science stuff, quantum entanglement is probably > near the top of the list, especially back in the days when Einstein > referred to it as that “spooky action at a distance.” Physicists have > since demonstrated the “spooky” phenomenon to be possible, but now > they want to extend its reach. A new study shows it’s possible for > quantum entanglement to span far longer distances than previously > demonstrated. > > “We have demonstrated the distribution of two entangled photons from a > satellite to two ground stations that are 1,203 kilometers [748 miles] > apart,” lead author Juan Yin, physicist at the Science and Technology > University of China in Shanghai, explained in a research paper > published in the journal Science. The previous record for entanglement > distribution reached only 100 kilometers (62 miles). > > Yin’s team used the Micius, the world’s first quantum-enabled > satellite which China launched in 2016, to transmit entangled photons > to several ground stations separated by long distances. They managed > to achieve this feat by using laser beams to prevent the light > particles from getting lost as they traveled. > > “The result again confirms the nonlocal feature of entanglement and > excludes the models of reality that rest on the notions of locality > and realism,” Yin and his colleagues wrote. > > WIDENING POSSIBILITIES > > Though quantum entanglement is incredibly complex, it’s possible to > explain it in simple terms. Two or more particles are entangled or > linked when a change in one’s state or properties instantaneously > affects the other’s. What makes this stranger is that this link works > regardless of distance. This phenomenon becomes particularly useful in > storing information — as in the case of using quantum bits (qubits) in > quantum computing. > > https://youtu.be/1zD1U1sIPQ4 > > By proving that quantum entanglement can be maintained in space over > such a long distance, this work paves the way for long-distance > satellite quantum communication and maybe even realize the > possibilities for quantum teleportation. “Long-distance entanglement > distribution is essential for the testing of quantum physics and > quantum networks,” Yin’s team wrote. > > Advances in quantum cryptography, which rely heavily on extending > entanglement, could change the way information is stored and > transferred in the future — opening up applications in improved > security in communication and even payment systems. > > > > On 9/3/17, H LV <hveeder...@gmail.com> wrote: > > Why can't one build a detector sensitive to the motion of a group wave so > > that it would be possible to send a signal faster than c? > > > > Harry > > > >
