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arXiv · 1706.08242

Quantum State Transfer from a Single Photon to a Distant Quantum-Dot Electron Spin

Yu He·Yu-Ming He·Yu-Jia Wei·Xiao Jiang·Kai Chen·Chao-Yang Lu·Jian-Wei Pan·Christian Schneider·Martin Kamp·Sven Hoefling
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Abstract

Quantum state transfer from flying photons to stationary matter qubits is an important element in the realization of quantum networks. Self-assembled semiconductor quantum dots provide a promising solid-state platform hosting both single photon and spin, with an inherent light-matter interface. Here, we develop a method to coherently and actively control the single-photon frequency bins in superposition using electro-optic modulators, and measure the spin-photon entanglement with a fidelity of $0.796\pm0.020$. Further, by Greenberger-Horne-Zeilinger-type state projection on the frequency, path and polarization degrees of freedom of a single photon, we demonstrate quantum state transfer from a single photon to a single electron spin confined in an InGaAs quantum dot, separated by 5 meters. The quantum state mapping from the photon's polarization to the electron's spin is demonstrated along three different axis on the Bloch sphere, with an average fidelity of $78.5\%$.

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Yu He, Yu-Ming He, Yu-Jia Wei, Xiao Jiang, Kai Chen, Chao-Yang Lu, Jian-Wei Pan, Christian Schneider, Martin Kamp, Sven Hoefling. 2017-06-26. Quantum State Transfer from a Single Photon to a Distant Quantum-Dot Electron Spin. https://doi.org/10.1103/physrevlett.119.060501

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