Experimental demonstration of nonlocal effects in the partial-collapse measurement and reversal process
Xiao‐Ye Xu, Jin‐Shi Xu, Chuan‐Feng Li, Yang Zou, Guang‐Can Guo · Physical Review A · 2011
We demonstrate experimentally the nonlocal reversal of a partial-collapse quantum measurement of a two-photon entangled state. Both the partial-collapse measurement and the reversal operation are implemented in linear optics with two displaced Sagnac interferometers, characterized by single-qubit quantum-process tomography. The recovered state is measured by quantum-state tomography, and its nonlocality is characterized by testing the Bell inequality. Our result will be helpful in quantum communication and quantum error correction.