Protective measurement of the wave function of a single squeezed harmonic-oscillator state

Details Protective measurement of the wave function of a single squeezed harmonic-oscillator state Protective measurement of the wave function of a single squeezed harmonic-oscillator state

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phrva..53.2911a&link_type=abstract

Physical Review A, vol. 53, Issue 5, pp. 2911-2914

Mathematics

Logic

9

Nonclassical States Of The Electromagnetic Field, Including Entangled Photon States, Quantum State Engineering And Measurements

Scientific paper

A scheme for the "protective measurement"

[Phys. Rev. A 47, 4616 (1993)]

of the wave function of a squeezed harmonic-oscillator state is described. This protective measurement is shown to be equivalent to a measurement of an ensemble of states. The protective measurement, therefore, allows for a definition of the quantum wave function on a single system. Yet, this equivalency also suggests that both measurement schemes account for the epistemological meaning of the wave function only. The protective measurement requires a full a priori knowledge of the measured state. The intermediate cases, in which only partial a priori information is given, are also discussed.

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