The Quantum Eraser

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


This chapter deals with a quantum process where the superposition of two probability amplitudes leads to an interference phenomenon. The two amplitudes can be associated with two quantum paths, as in a double slit interference experiment. We shall first show that these interferences disappear if an intermediate measurement gives information about which path has actually been followed. Next, we shall see how interferences can actually reappear if this information is “erased” by a quantum device.


Spin State Probability Amplitude Lateral Maximum Spin Precess Interference Phenomenon 
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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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