Is Quantum Linear Superposition an Exact Principle of Nature?

  • Angelo BassiEmail author
  • Tejinder Singh
  • Hendrik Ulbricht
Part of the The Frontiers Collection book series (FRONTCOLL)


The principle of linear superposition is a hallmark of quantum theory. It has been confirmed experimentally for photons, electrons, neutrons, atoms, for molecules having masses up to ten thousand amu, and also in collective states such as SQUIDs and Bose-Einstein condensates. However, the principle does not seem to hold for positions of large objects! Why for instance, a table is never found to be in two places at the same time? One possible explanation for the absence of macroscopic superpositions is that quantum theory is an approximation to a stochastic nonlinear theory. This hypothesis may have its fundamental origins in gravitational physics, and is being put to test by modern ongoing experiments on matter wave interferometry.


Quantum Theory Interference Pattern Linear Superposition Fundamental Constant Interference Experiment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This work is supported by a grant from the John Templeton Foundation.


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Angelo Bassi
    • 1
    Email author
  • Tejinder Singh
    • 2
  • Hendrik Ulbricht
    • 3
  1. 1.Department of PhysicsUniversity of TriesteTriesteItaly
  2. 2.Tata Institute of Fundamental ResearchMumbaiIndia
  3. 3.School of Physics and AstronomyUniversity of SouthamptonSouthamptonUK

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