Realization of Measurement and the Standard Quantum Limit

  • Masanao Ozawa
Part of the NATO ASI Series book series (NSSB, volume 190)


What measurement is there? It is a difficult question but the importance of this question has increased much in connection with the effort to detect gravitational radiation. For monitoring the position of a free mass such as the gravitational-wave interferometer [1], it is usually supposed that the sensitivity is limited by the so called standard quantum limit (SQL) [2,3]. In the recent controversy [4]–[8], started with Yuen’s proposal [4] of a measurement which beats the SQL, the meaning of the SQL has been much clarified. In order to settle this controversy, rigorous treatment of the question on what measurement there is seems the key point.


Measurement Probability Probe System Contractive State Density Operator Position Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • Masanao Ozawa
    • 1
  1. 1.Department of Mathematics College of General EducationNagoya UniversityNagoya 464Japan

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