Phys. Rev. A 45, 1347–1356 (1992)Nondemolition observation of a free quantum particleReceived 28 May 1991; published in the issue dated February 1992 A stochastic model of a continuous nondemolition observation of a quantum system is presented. The nonlinear stochastic wave equation describing the posterior dynamics of the observed quantum system is solved for a free particle of mass m>0. It is shown that the dispersion of the Gaussian wave packet does not increase to infinity as for a free unobserved particle, but tends to the finite limit τ∞2=(ħ/2λm)1/2, where λ is the accuracy coefficient of an indirect nondemolition measurement of the particle’s position. © 1992 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.45.1347
DOI:
10.1103/PhysRevA.45.1347
PACS:
03.65.Bz, 02.50.+s
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