Photons selected by a small mask near an optical vortex have mean transverse momentum exceeding a bound set by local momentum conservation, providing experimental evidence for counterfactual violation in postselected quantum events.
Kempf, Black holes, bandwidths and beethoven, Jour- nal of Mathematical Physics41, 2360 (2000)
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Evidence for Counterfactual Violation of Local Conservation Laws in Quantum Events
Photons selected by a small mask near an optical vortex have mean transverse momentum exceeding a bound set by local momentum conservation, providing experimental evidence for counterfactual violation in postselected quantum events.