Comment on "Does the weak trace show the past of a quantum particle?"

• URL: http://arxiv.org/abs/2202.11574v1
• Date: Wed, 23 Feb 2022 15:47:03 GMT
• Title: Comment on "Does the weak trace show the past of a quantum particle?"
• Authors: Q. Duprey and A. Matzkin
• Abstract summary: We argue that null weak values of the spatial projectors are inadequate to infer the presence of a quantum particle at an intermediate time between preparation and detection. This conclusion relies on two arguments - (i) the role of the disturbance induced by a weak measurement, and (ii) classical-like features like continuous paths that must purportedly be associated with a quantum particle presence.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In the paper "Does the weak trace show the past of a quantum particle?" [arXiv:2109.14060v2], it is argued that null weak values of the spatial projectors are inadequate to infer the presence of a quantum particle at an intermediate time between preparation and detection. This conclusion relies on two arguments - (i) the role of the disturbance induced by a weak measurement, and (ii) classical-like features like continuous paths that must purportedly be associated with a quantum particle presence. Here we first show that (i) arises from a misunderstanding of null weak values by putting forward a simple counter-example that highlights that the relevant quantities to examine are the vanishing amplitudes, not the wavefunction. Then we briefly argue that enforcing classical pre-conditions in order to account for quantum properties during unitary evolution is unlikely to lead to a consistent understanding of quantum phenomena.

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