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Semiconductor Transistor Is Triggered by Light

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Researchers have demonstrated a single-photon switch and transistor that is enabled by solid-state quantum memory. The device consists of a semiconductor spin qubit coupled to a nanophotonic cavity. It is extremely compact (roughly 1 million of the quantum transistors could fit inside a grain of salt) and is able to process 10 billion photonic qubits per second. To create a quantum transistor, a University of Maryland team embedded a quantum dot (QD) in the photonic crystal cavity of its solid-state system. A single photon is used to manipulate the occupation of electronic energy levels...Read full article

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