Reversing the Weak Quantum Measurement for a Photonic Qubit
Quantum Physics
2015-05-13 v1
Abstract
We demonstrate the conditional reversal of a weak (partial-collapse) quantum measurement on a photonic qubit. The weak quantum measurement causes a nonunitary transformation of a qubit which is subsequently reversed to the original state after a successful reversing operation. Both the weak measurement and the reversal operation are implemented linear optically. The state recovery fidelity, determined by quantum process tomography, is shown to be over 94% for partial-collapse strength up to 0.9. We also experimentally study information gain due to the weak measurement and discuss the role of the reversing operation as an information erasure.
Keywords
Cite
@article{arxiv.0903.3077,
title = {Reversing the Weak Quantum Measurement for a Photonic Qubit},
author = {Yong-Su Kim and Young-Wook Cho and Young-Sik Ra and Yoon-Ho Kim},
journal= {arXiv preprint arXiv:0903.3077},
year = {2015}
}