Laser Physics pp 249-263 | Cite as

Quantum non demolition measurements

  • D. F. Walls
  • G. J. Milburn
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 182)


The effort to detect gravitational radiation has motivated renewed interest in the quantum limitations to measurements.We have shown that in principal quantum mechanics does not preclude the detection of gravitational radiation.

We have also given a complete analysis, including state reduction, of two possible schemes to make Q.N.D. measurements. These are based on a “squeezed state” detection scheme and a quantum counting detection scheme.

It has been demonstrated that despite initial misgivings the parametric amplifier is capable of making “squeezed state” Q.N.D. measurements. This conclusion is reached by taking fully into account the reduction of state which occurs in a measurement sequence.


Harmonic Oscillator Coherent State Density Operator Gravitational Radiation Free Evolution 
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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • D. F. Walls
    • 1
  • G. J. Milburn
    • 1
  1. 1.Physics DepartmentUniversity of WaikatoHamiltonNew Zealand

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