Experimental Test of Error-Disturbance Uncertainty Relations by Weak Measurement

Understand

We experimentally test the error-disturbance uncertainty relation (EDR) in generalized, strength-variable measurement of a single photon polarization qubit, making use of weak measurement that keeps the initial signal state practically unchanged.

• We demonstrate that Heisenberg's EDR is violated, yet Ozawa's and Branciard's EDRs are valid throughout the range of our measurement strength.