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Wave-Particle duality: Quantum erasing the nature of reality: Or, perhaps, the reality of nature?

Paul G. Kwiat, Berthold‐Georg Englert

Published Jan 1, 2015• 0 citations
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In this article, physical reality as a whole is defined, thereby revealing the actual nature of physical reality to be that of a boundary created by a relation, as that boundary is apprehended from one side of the relation that brings it into existence. The reason we can’t pin down a specific physical reality, i.e., completely define any physical reality, is because in doing so we are trying to pin down what is effectively a miniature rainbow, trying to pin down that which is actually only the product of a relation, trying to pin down something that, in the final analysis, is not at all or in any way what is actually there, but only seems to be what is actually there. However, while we cannot ever pin down any specific physical reality for the reasons mentioned above, we can pin down the nature of physical reality as a whole. We cannot get to the end of a rainbow, because rainbows only appear to have an end. However, we can understand the true nature of the rainbow and understand how it is created and why it appears as it does. In the same way, although we cannot pin down any specific physical reality, we can understand the nature of physical reality as a whole, how physical reality is created and why physical reality appears as it does, if we are able to understand what it is that the phenomena of wave-particle duality and uncertainty are actually telling us about the nature of physical reality.

Prespacetime journal•Jan 1, 2011•2 citations
The Schrödinger's wave function can naturally be realized as an 'instantaneous resonant spatial mode' in which quantum particle moves and hence the Born's rule is derived after identifying its origin. This realization facilitates the visualization of `what's really going on?' in the Young's double-slit experiment which is known to be the central mystery of quantum mechanics. Also, an actual mechanism underlying the `spooky-action-at-a-distance', another mystery regarding the entangled quantum particles, is revealed. Wheeler's delayed choice experiments, delayed choice quantum eraser experiment and delayed choice entanglement swapping experiments are unambiguously and naturally explained at a single quantum level. The reality of Nature represented by the quantum mechanical formalism is conceptually intuitive and is independent of the measurement problem.
Single-photon interference is a beautiful manifestation of the wave–particle duality of light and the double-slit Gedankenexperiment is a standard lecture example for introducing quantum mechanical reality. Interference arises only if each photon can follow several (classical) paths from the source to the detector, and if one does not have the possibility to determine which specific path the photon has taken. Attaching a specific label to the photon traveling along a specific path destroys the interference. However, in some cases those labels can be erased from the photon between leaving the apparatus and being detected, by which interference can be restored, a phenomenon called quantum erasing. We present lecture demonstration experiments that illustrate the wave–particle duality of light and the phenomenon of quantum erasing. Both experiments are first shown with strong light and, in a second step, on a photon-by-photon basis. The smooth transition from the quantum to the classical case can be shown in real time by varying the incident light intensity.
In this article, physical reality as a whole is defined, thereby revealing the actual nature of physical reality to be that of a boundary created by a relation, as that boundary is apprehended from one side of the relation that brings it into existence. The reason we can’t pin down a specific physical reality, i.e., completely define any physical reality, is because in doing so we are trying to pin down what is effectively a miniature rainbow, trying to pin down that which is actually only the product of a relation, trying to pin down something that, in the final analysis, is not at all or in any way what is actually there, but only seems to be what is actually there. However, while we cannot ever pin down any specific physical reality for the reasons mentioned above, we can pin down the nature of physical reality as a whole. We cannot get to the end of a rainbow, because rainbows only appear to have an end. However, we can understand the true nature of the rainbow and understand how it is created and why it appears as it does. In the same way, although we cannot pin down any specific physical reality, we can understand the nature of physical reality as a whole, how physical reality is created and why physical reality appears as it does, if we are able to understand what it is that the phenomena of wave-particle duality and uncertainty are actually telling us about the nature of physical reality.