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RESEARCH
  ANALYSIS
  TRENDS








































             Quantum leap for photon entanglement


             could revolutionize secure communications



            A  breakthrough  in  the  development  of  quantum-  to use in applications such as secure satellite-to-ground
            enhanced  optical  systems  could  pave  the  way  for   and satellite-to-satellite communications.
            advances    in   encryption,   communication   and
            measurement, scientists say.                         The  Glasgow-led  team’s  new  method  of  generating
                                                                 entangled  photons  further  into  the  infrared  at  two
            In  a  new  paper  published  in  the  journal  Science   micrometers  wavelength  could  help  overcome  these
            Advances, a group of researchers, led by Matteo Clerici   problems for the first time.
            at  the  University  of  Glasgow’s  James  Watt  School  of
            Engineering  and  colleagues  from  the  UK,  Japan  and   Dr  Matteo  Clerici,  Senior  Lecturer  at  the  University  of
            Germany,  demonstrates  a  new  method  of  generating   Glasgow, said: “What we have been able to do for the
            and  detecting  quantum-entangled  photons  at  a    first  time  is  carve  out  a  band  in  the  electromagnetic
            wavelength of 2.1 micrometers.                       spectrum where the entangled particles we produce are
                                                                 less likely to be affected by background solar radiation
            The  unique,  non-classical  properties  of  entangled   when they’re transmitted across free space.
            photons are used in applications including quantum key
            distribution, which makes uncrackable communications   “There is  what  we call a  ‘transparency  window’ in the
            between two parties possible.                        atmosphere where there aren’t many gases which can
                                                                 absorb light at a wavelength of two micrometers. Also,
            Methods of entangling photons at shorter wavelengths   the sunlight is much less overwhelming in this region –
            of between 700 and 1550 nanometers are already well-  it’s  one-third  the  brightness  that  it  has  at  standard
            established.   However,   those   wavelengths   are   telecommunication  wavelengths  around  1550  nm,  for
            vulnerable  to  interference  from  the  sun’s  light  when   example.
            they are transmitted over open air, making them difficult



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