• Corpus ID: 118608848

Spontaneous Symmetry Breaking via Measurement: From Bose-Einstein Condensates to Josephson Effect

@article{Monnai2014SpontaneousSB,
  title={Spontaneous Symmetry Breaking via Measurement: From Bose-Einstein Condensates to Josephson Effect},
  author={Takaaki Monnai and Mauro Iazzi and Kazuya Yuasa},
  journal={arXiv: Quantum Physics},
  year={2014}
}
Why does spontaneous symmetry breaking occur? Why is a state breaking symmetry realized? We explore an idea that measurement selects such a state even if a system is given in a state respecting the symmetry of the system. We point out that the spectrum of the relevant observable is important, and simply apply the projection postulate for quantum measurement. We first show that this approach correctly describes the well-known interference of Bose-Einstein condensates. We then examine a fermionic… 
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