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
> “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.
> 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