One of the most surprising consequences of quantum mechanics is the entanglement of two or more distant particles. In an entangled EPR two-particle system, the value of the momentum (position) for neither single subsystem is determined. However, if one of the subsystems is measured to have a certain momentum(position), the other subsystem is determined to have a unique corresponding value, despite the distance between them. This peculiar behavior of an entangled quantum system has been observed experimentally, such as in two-photon temporal correlation measurements and in two-photon imaging experiments. This article addresses the fundamental concerns behind these experimental observations and explores the nonclassical nature of two-photon superposition by emphasizing the physics of 2 ٯ 1+1.
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Shih, Y. (2009). The Physics of 2 ≠ 1+1. In: Quantum Reality, Relativistic Causality, and Closing the Epistemic Circle. The Western Ontario Series in Philosophy of Science, vol 73. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9107-0_11
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