A study in Nature Physics introduces a novel method for generating quantum entanglement using a quantum dot, which violates the Bell inequality. This ultra-low power method could pave the way for scalable and efficient quantum technologies. Quantum entanglement is essential for quantum computing, where qubits become correlated regardless of their distance. Measuring one qubit impacts the other, verified through the Bell inequality, a theorem that tests quantum mechanics by measuring entangled qubits.
Dr. Shikai Liu from The Niels Bohr Institute led the research, which focused on quantum dots and waveguides. Quantum dots are nanoscale structures that act like artificial atoms, trapping neutral excitons and exhibiting quantized energy states. These quantum dots, integrated into a chip, can emit single photons with high efficiency, which can become entangled under certain conditions. To improve efficiency and stability, the researchers coupled the quantum dot with a photonic crystal waveguide, enhancing light-matter interactions.
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