Error-Disturbance Uncertainty Relations in Neutron-Spin Measurements

Figure 1

A successive measurement scheme of observables and exploited for the demonstration of the error-disturbance uncertainty relation. After state preparation (blue) apparatus carries out a projective measurement of instead of (light red), thereby disturbing observable which is detected by apparatus (green), error and disturbance are quantitatively determined by the four possible outcomes denoted by (), (), (), and ().