Towards All Optical, Universal Quantum Computation using Trapped   Electron Spins and Cavity Polariton Resonance
  We propose an all optical quantum computation scheme, with trapped electron spin qubits, using their Coulomb exchange interaction with optically excited microcavity exciton-polaritons. This paper describes a single qubit rotation, which together with two-qubit controlled-z gate presented in PRB 85, 241403(R) (2012), form a set of universal logic gates. The errors due to finite cavity lifetime and incorrect orientation of the rotation axis are minimized by optimizing pump pulse parameters. With projective homodyne phase measurement and initialization, our scheme is a promising candidate for the physical realization of a universal quantum computer. 
Shruti Puri, Na Young Kim, Eisuke Abe and Yoshihisa Yamamoto
quant-ph cond-mat.mes-hall