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Caltech Science Exchange: This resource explains that in quantum science, objects like electrons and photons exhibit wavelike properties that can combine into superposed states. It notes that "when an electron is in superposition, its different states can be thought of as separate outcomes, each with a particular probability of being observed."
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QuantumExplainer.com: This article discusses the superposition principle, stating that "particles can exist in multiple states simultaneously until observed, challenging determinism and highlighting the probabilistic nature of quantum reality."
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Quantum Inspire: This platform describes superposition as a fundamental principle of quantum mechanics, where "a quantum state in superposition can be seen as a linear combination of other distinct quantum states."
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Physics LibreTexts: In their discussion on the superposition principle, they state that "the superposition principle tells us that, in general, the quantum state of the electron is α0|0⟩ + α1|1⟩ + ⋯ + αk−1|k − 1⟩, where α0, α1, …, αk−1 are complex numbers normalized so that ∑j |αj|² = 1."
These sources provide detailed insights into how superposition is a cornerstone of quantum mechanics, illustrating the non-intuitive nature of particles existing in multiple states simultaneously.