Weak-value amplification of light deflection by a dark atomic ensemble

作者:Zhou, Lan*; Turek, Yusuf; Sun, C. P.; Nori, Franco
来源:Physical Review A, 2013, 88(5): 053815.
DOI:10.1103/PhysRevA.88.053815

摘要

We study the coherent propagation of light whose dynamics is governed by the effective Schrodinger equation derived in a magneto-optically manipulated atomic ensemble with a four-level tripod configuration for electromagnetically induced transparency (EIT). The small transverse deflection of an optical beam, which is ultrasensitive to the EIT effect, could be drastically amplified via a weak measurement with an appropriate preselection and postselection of the polarization state. The physical mechanism is explained as the effect of wave-packet reshaping, which results in an enlarged group velocity in the transverse direction.