Experimental test of error-disturbance uncertainty relations by weak measurement.
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 the Heisenberg EDR is violated, yet the Ozawa and Branciard EDRs are valid throughout the range of our measurement strength.
Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan.
Fumihiro
F
Kaneda
Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan.
So-Young
SY
Baek
Graduate School of Information Science, Nagoya University, Nagoya 464-8601, Japan.
Masanao
M
Ozawa
Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan.
Keiichi
K
Edamatsu