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As a special experimental technique, weak measurement extracts very littleinformation about the measured system and will not cause the measured statecollapse. When coupling the orbital angular momentum (OAM) state with awell-defined pre-selected and post-selected system of a weak measurementprocess, there is an indirect coupling between position and topological charge(TC) of OAM state. Based on these ideas, we propose an experimental scheme thatexperimentally measure the TC of OAM beams from -14 to 14 through weakmeasurement.

An experimental measurement of the topological charge of orbital angular momentum beams through weak measurement