Physics – Quantum Physics
Scientific paper
2007-08-15
Phys. Rev. B 78, 085307 (2008)
Physics
Quantum Physics
5 pages, 3 figures
Scientific paper
10.1103/PhysRevB.78.085307
We propose a quantum non-demolition method - giant Faraday rotation - to detect a single electron spin in a quantum dot inside a microcavity where negatively-charged exciton strongly couples to the cavity mode. Left- and right-circularly polarized light reflected from the cavity feels different phase shifts due to cavity quantum electrodynamics and the optical spin selection rule. This yields giant and tunable Faraday rotation which can be easily detected experimentally. Based on this spin-detection technique, a scalable scheme to create an arbitrary amount of entanglement between two or more remote spins via a single photon is proposed.
Hu C-. Y.
O'Brien Jeremy L.
Rarity John G.
Young Alex
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