Laser Physics

, Volume 22, Issue 10, pp 1553–1564 | Cite as

Weak measurements as an instance of non-ideal measurements

  • A. K. PanEmail author
  • A. Matzkin
Nonlinear and Quantum Optics


We introduce weak measurements (WM) as a type of non-ideal measurement (NIM) coupling the system and the measuring device in a specific manner involving a weak interaction followed by post-selection. For the particular case of a WM measurement of spin, we solve the quantum dynamics for the coupled system-meter ensemble exactly for any type of non-ideal measurement. The standard WM regime is obtained as a limiting case; eccentric “semi-weak” values not only appear in other cases of NIM, but can also have a larger magnitude than the usual weak values. A couple of examples comparing the merits of the WM regime and of the exact treatment in situations of potential interest to quantum information applications are considered.


Wave Packet Laser Physics Momentum Space Ideal Measurement Weak Measurement 
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Copyright information

© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  1. 1.Laboratoire de Physique Théorique et Modélisation (CNRS Unité 8089)Université de Cergy-PontoiseCergy-Pontoise cedexFrance

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