06 (2012 Selected)：

Research on charge-state controlled single-photon device toward realizing long-distance transfer of electron spin state

Generation of (long-distance) quantum entanglement between two remote devices is extremely important for the development of quantum information technology including quantum communication and quantum computation, especially for quantum repeaters. In this project, we develop a quantum dot single photon source with a side gate to realize the (spin-spin) entanglement of two remote electronic devices, which corresponds to a semiconductor-based distribution of EPR pairs.

We develop a quantum dot device comprising a p-i-n diode structure with a side gate similar to a vertical type single electron device.
The side gate of the single photon device controls the quantum dot electronic states to create photons required for high fidelity quantum entanglement. The gate control produces interference between the generated single photons. We also develop a photon-detection method that is capable of measuring two-photon interference. This novel method extracts photons from the back-side of the device because the top of the device is covered by electrodes. Through developing these techniques, we aim to study long-distance entanglement between two remote quantum memories. The study describes a long-distance quantum state transfer technique of electron spin in semiconductors through photons. We believe the study contributes to the realization of quantum cybernetics mediated by electrons in semiconductors.

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