Phys. Rev. Lett. 93, 203902 (2004) [4 pages]Direct Measurement of Superluminal Group Velocity and Signal Velocity in an Optical FiberReceived 21 July 2004; published 11 November 2004 We present an easy way of observing superluminal group velocities using a birefringent optical fiber and other standard devices. In the theoretical analysis, we show that the optical properties of the setup can be described using the notion of “weak value.” The experiment shows that the group velocity can indeed exceed c in the fiber; and we report the first direct observation of the so-called “signal velocity,” the speed at which information propagates and that cannot exceed c. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.203902
DOI:
10.1103/PhysRevLett.93.203902
PACS:
42.81.Gs, 42.25.Bs
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