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   From: alt.fan.jai-maharaj@googlegroups.com   
      
   Spin measurements evade Heisenberg uncertainty principle   
      
   Chemistry World, chemistryworld.com   
   March 30, 2017   
      
   New technique allows atomic spin properties to be   
   measured simultaneously with greater accuracy   
      
   Many seemingly unrelated scientific techniques, from NMR   
   spectroscopy to medical MRI and timekeeping using atomic   
   clocks, rely on measuring atomic spin -- the way an   
   atom's nucleus and electrons rotate around each other.   
   The limit on how accurate these measurements can be is   
   set by the inherent fuzziness of quantum mechanics.   
   However, physicists in Spain have demonstrated that this   
   limit is much less severe than previously believed,   
   measuring two crucial quantities simultaneously with   
   unprecedented precision.   
      
   Scientists evade the Heisenberg uncertainty principle   
   Source: (c) ICFO   
      
   With the right experimental setup, different spin   
   properties can be measured simultaneously   
      
   Central to the limits of quantum mechanics is the   
   Heisenberg uncertainty principle, which states that it is   
   not possible to know a particle's position and momentum   
   with absolute accuracy, and the more precisely you   
   measure one quantity, the less you know about the other.   
   This is because to measure its position you have to   
   disturb its momentum by hitting it with another particle   
   and observing how the momentum of this second particle   
   changes. A similar principle applies to measuring a   
   particle's spin angular momentum, which involves   
   observing how the polarisation of incident light is   
   changed by the interaction with the particle – every   
   measurement disturbs the atom's spin slightly. To infer   
   the spin precession rate, you need to measure the spin   
   angle, as well as its overall amplitude, repeatedly.   
   However, every measurement disturbs the spin slightly,   
   creating a minimum possible uncertainty.   
      
   Continues at:   
      
   https://www.chemistryworld.com/news/spin-measurements-evade-heis   
   nberg-uncertainty-principle/3007036.article   
      
   Jai Maharaj, Jyotishi   
   Om Shanti   
      
   http://bit.do/jaimaharaj   
      
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