Abstract
The Kerr rotation (KR) induced by a charged quantum dot (QD) transition has been proposed as a mechanism to entangle a photon with an electron spin for quantum information applications [1]. Until now, only a few μrads have been measured for charged QDs in similar planar low Q-factor structures [2-4], while nonlinear phase shifts of 3-7 degrees have been reported in micropillars with Q-factors between 103 and 105 [5,6]. The non-linear Kerr rotation (KR) is thought, until now, to scale linearly with Q-factor and modal volume, i.e. cooperativity factor g2/κγ, where g is the dipole coupling constant, κ is the photon loss from the cavity, and γ the dephasing rate of the QD [4,5]. Nevertheless in our case, in a low Q-factor (Q~200) micropillar, a phase shift of several degrees has been observed (~8), induced by a bright negatively charged QD transition, dependent on the spin orientation. A deviation from the previously standard approach is demonstrated and new avenues for solid state emitters in cavity Quantum Electrodynamics (QED) systems are created.
© 2015 IEEE
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