Phys. Rev. D 40, 2112–2117 (1989)

The sense in which a "weak measurement" of a spin-½ particle's spin component yields a value 100

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I. M. Duck and P. M. Stevenson
T. W. Bonner Nuclear Laboratory, Physics Department, Rice University, Houston, Texas 77251-1892

E. C. G. Sudarshan
Physics Department, Rice University, Houston, Texas 77251-1892, Center for Particle Theory, Physics Department, University of Texas, Austin, Texas 78712, and Institute of Mathematical Sciences, Taramani, Madras 600113, India

Received 22 September 1988; revised 7 June 1989; published in the issue dated 15 September 1989

We give a critical discussion of a recent Letter of Aharonov, Albert, and Vaidman. Although their work contains several flaws, their main point is valid: namely, that there is a sense in which a certain "weak measurement" procedure yields values outside the eigenvalue spectrum. Our analysis requires no approximations and helps to clarify the physics behind the effect. We describe an optical analog of the experiment and discuss the conditions necessary to realize the effect experimentally.

URL:

http://link.aps.org/doi/10.1103/PhysRevD.40.2112

DOI:

10.1103/PhysRevD.40.2112

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Phys. Rev. D 40, 2112–2117 (1989)

The sense in which a "weak measurement" of a spin-½ particle's spin component yields a value 100