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arXiv · 1805.05147

Quantum state transfer of angular momentum via single electron photo-excitation from a Zeeman-resolved light hole

Kazuyuki Kuroyama·Marcus Larsson·Jo Muramoto·Kentaro Heya·Takafumi Fujita·Giles Allison·Sascha R. Valentin·Arne Ludwig·Andreas D. Wieck·Sadashige Matsuo·Akira Oiwa·Seigo Tarucha
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Abstract

Electron spins in GaAs quantum dots have been used to make qubits with high-fidelity gating and long coherence time, necessary ingredients in solid-state quantum computing. The quantum dots can also host photon qubits with energy applicable for optical communication, and can show a promising photon-to-spin conversion. The coherent interface is established through photo-excitation of a single pair of an electron and a Zeeman-resolved light-hole, not heavy-hole. However, no experiments on the single photon to spin conversion have been performed yet. Here we report on single shot readout of a single electron spin generated in a GaAs quantum dot by spin-selective excitation with linearly polarized light. A photo-electron spin generated from a Zeeman-resolved light-hole exciton is detected using an optical spin blockade method in a single quantum dot and a Pauli spin blockade method in a double quantum dot. We found that the blockade probability strongly depends on the photon polarization and the hole state, heavy- or light-hole, indicating a transfer of the angular momentum from single photons to single electron spins. Our demonstration will open a pathway to further investigation on fundamental quantum physics such as quantum entanglement between a wide variety of quantum systems and applications of quantum networking technology.

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Kazuyuki Kuroyama, Marcus Larsson, Jo Muramoto, Kentaro Heya, Takafumi Fujita, Giles Allison, Sascha R. Valentin, Arne Ludwig, Andreas D. Wieck, Sadashige Matsuo, Akira Oiwa, Seigo Tarucha. 2018-05-14. Quantum state transfer of angular momentum via single electron photo-excitation from a Zeeman-resolved light hole. https://doi.org/10.1103/physrevb.99.085203

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