Coherent Optical Control of a Quantum-Dot Spin-Qubit in a Waveguide-Based Spin-Photon Interface

Ding, Dapeng and Appel, Martin Hayhurst and Javadi, Alisa and Zhou, Xiaoyan and Lobl, Matthias Christian and Sollner, Immo and Schott, Ruediger and Papon, Camille and Pregnolato, Tommaso and Midolo, Leonardo and Wieck, Andreas Dirk and Ludwig, Arne and Warburton, Richard John and Schroder, Tim and Lodahl, Peter. (2019) Coherent Optical Control of a Quantum-Dot Spin-Qubit in a Waveguide-Based Spin-Photon Interface. Physical review applied, 11 (3). 031002.

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Waveguide-based spin-photon interfaces on the GaAs platform have emerged as a promising system for a variety of quantum information applications directly integrated into planar photonic circuits. The coherent control of spin states in a quantum dot can be achieved by applying circularly polarized laser pulses that may be coupled into the planar waveguide vertically through radiation modes. However, proper control of the laser polarization is challenging since the polarization is modified through the transformation from the far field to the exact position of the quantum dot in the nanostructure. Here, we demonstrate polarization-controlled excitation of a quantum-dot electron spin and use that to perform coherent control in a Ramsey interferometry experiment. The Ramsey interference reveals an inhomogeneous dephasing time of 2.2 +/- 0.1 ns, which is comparable to the values so far only obtained in bulk media. We analyze the experimental limitations in spin initialization fidelity and Ramsey contrast and identify the underlying mechanisms.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Physics (Warburton)
UniBasel Contributors:Warburton, Richard J and Javadi, Alisa and Löbl, Matthias and Söllner, Immo
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:21 Apr 2020 10:43
Deposited On:21 Apr 2020 10:43

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