We propose an interface between the spin of a photon and the spin of an electron confined in a quantum dot embedded in a microcavity operating in the weak coupling regime. This interface, based on spin selective photon reflection from the cavity, can be used to construct a CNOT gate, a multi-photon entangler and a photonic Bell-state analyzer. Finally, we analyze experimental feasibility, concluding that the schemes can be implemented with current technology.
@article{arxiv.1004.1414,
title = {CNOT and Bell-state analysis in the weak-coupling cavity QED regime},
author = {Cristian Bonato and Florian Haupt and Sumant S. R. Oemrawsingh and Jan Gudat and Dapend Ding and Martin P. van Exter and Dirk Bouwmeester},
journal= {arXiv preprint arXiv:1004.1414},
year = {2010}
}