We propose a quantum noise eater for a single qubit and experimentally verify its performance for recovery of a superposition carried by a dual-rail photonic qubit. We consider a case when only one of the rails (e.g., one of interferometric arms) is vulnerable to noise. A coherent but randomly arriving photon penetrating into this single rail causes a change of its state, which results in an error in a subsequent quantum information processing. We theoretically prove and experimentally demonstrate a conditional full recovery of the superposition by this quantum noise eater.
Cite
@article{arxiv.1308.0831,
title = {Quantum noise eater for a single photonic qubit},
author = {Miroslav Gavenda and Lucie Čelechovská and Miloslav Dušek and Radim Filip},
journal= {arXiv preprint arXiv:1308.0831},
year = {2015}
}