Quantum dots are particularly promising for optical applications due to their high extinction coefficient[68] and ultrafast optical nonlinearities with potential applications for developing all-optical systems.[69] They operate like a single-electron transistor and show the Coulomb blockade effect. Quantum dots have also been suggested as implementations of qubits for quantum information processing,[70] and as active elements for thermoelectrics.[71][72][73]
Answer. According to classical mechanics, the radiant energy produced by oscillating objects is continuous. According to quantum mechanics, their energy can be thought of as existing in discrete levels.
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