According to Hudson's theorem, the only quantum pure states with a positive Wigner function are Gaussian states. We summarize and compare some recent attempts at extending this theorem to the space of quantum mixed states, and complement them with new results obtained from numerical observations. Specifically, we look for upper bounds on the admissible non-Gaussianity of mixed states with a positive Wigner function.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2010|
|Event||Quantum Groups, Quantum Foundations, and Quantum Information: A Festschrift for Tony Sudbery - York, United Kingdom|
Duration: Sep 29 2008 → Sep 30 2008
ASJC Scopus subject areas
- Physics and Astronomy(all)