Schrödinger’s Cat

  • Jean-Louis Basdevant
  • Jean Dalibard
Part of the Advanced Texts in Physics book series (ADTP)


The superposition principle states that if |φ a ̪ and |φ b ̪ are two possible states of a quantum system, the quantum superposition (|φ a ̪ + |φ b ̪)/ \( \left( {|{\phi _a}\rangle + |{\phi _b}} \right)/\sqrt 2 \) is also an allowed state for this system. This principle is essential in explaining interference phenomena. However, when it is applied to “large” objects, it leads to paradoxical situations where a system can be in a superposition of states which is classically self-contradictory (antinomic).


Statistical Mixture Paradoxical Situation Quantum Superposition Simple Pendulum Gaussian Envelope 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Jean-Louis Basdevant
    • 1
  • Jean Dalibard
    • 2
  1. 1.Département de PhysiqueEcole PolytechniquePalaiseau CedexFrance
  2. 2.Département de Physique, Laboratoire Kastler BrosselEcole Normale SupérieureParis Cedex 05France

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