Photon Phase Shift at the Few-Photon Level and Optical Switching by a Quantum Dot in a Microcavity
Abstract
We exploit the nonlinearity arising from the spin-photon interaction in an In As quantum dot to demonstrate phase shifts of scattered light pulses at the single-photon level. Photon phase shifts of close to 90∘ 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 that explores the dynamics of the system. Our results demonstrate the potential of quantum-dot-induced nonlinearities for quantum information processing.
- Publication:
-
Physical Review Applied
- Pub Date:
- June 2019
- DOI:
- 10.1103/PhysRevApplied.11.061001
- arXiv:
- arXiv:1907.07991
- Bibcode:
- 2019PhRvP..11f1001W
- Keywords:
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- Quantum Physics;
- Physics - Optics
- E-Print:
- Physical Review Applied, 11(6) (2019)