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Photon Phase Shift at the Few-Photon Level and Optical Switching by a Quantum Dot in a Microcavity
2019
Physical Review Applied
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We exploit the nonlinearity arising from the spin-photon interaction in an InAs quantum dot to demonstrate phase shifts of scattered light pulses at the single-photon level. Photon phase shifts of close to 90 degrees are achieved using a charged quantum dot in a micropillar cavity. We also demonstrate a photon phase switch by using a spin-pumping mechanism through Raman transitions in an in-plane magnetic field. The experimental findings are supported by a theoretical model which explores the
doi:10.1103/physrevapplied.11.061001
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