ID: 2203.07213

Wigner's friends, tunnelling times and Feynman's "only mystery of quantum mechanics"

March 14, 2022

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Developments in time analysis of particle and photon tunnelling

December 6, 1996

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V. S. Olkhovsky, A. Agresti
General Physics

A compact analysis of development and prospects in the study of the tunnelling evolution is given. A new systematization of various approaches to defining tunnelling times in the light of time as a quantum mechanical observable is proposed. The problem of superluminal group velocities, without violations of special relativity, is also taken in account. Then a particular attention is devoted to the presentation of new results on the analogy between particle and photon tunnelli...

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Wigner's Isolated Friend

December 6, 2019

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Arne Hansen, Stefan Wolf
History and Philosophy of Ph...

The measurement problem is seen as an ambiguity of quantum mechanics, or, beyond that, as a contradiction within the theory: Quantum mechanics offers two conflicting descriptions of the Wigner's-friend experiment. As we argue in this note there are, however, obstacles from within quantum mechanics and regarding our perspective onto doing physics towards fully describing a measurement. We conclude that the ability to exhaustively describe a measurement is an assumption necessa...

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Wigner's friend, Feynman's paths and material records

September 2, 2020

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A. Matzkin, D. Sokolovski
Quantum Physics

The place and role of an Observer in quantum mechanics has been a subject of an ongoing debate since the theory's inception. Wigner brought this question to the fore in a celebrated scenario in which a super-Observer observes a Friend making a measurement. Here we briefly review why this \e{Wigner Friend scenario} has been taken to require the introduction of the Observer's consciousness, or alternatively to show the inconsistency of quantum measurement theory. We will argue ...

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Quantum temporal probabilities in tunneling systems: II. No faster-than-light signals are possible in tunneling

December 28, 2012

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Charis Anastopoulos, Ntina Savvidou
Quantum Physics

In this article, we propose a resolution to the paradox of apparent superluminal velocities for tunneling particles, by a careful treatment of temporal observables in quantum theory and through a precise application of the duality between particles and waves. To this end, we employ a new method for constructing probabilities associated to quantum time measurements that provides an explicit link between the tunneling time of particles and the associated quantum fields. We demo...

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Tunnelling times, Larmor clock,and the elephant in the room

February 5, 2021

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D. Sokolovski, E. Akhmatskaya
Quantum Physics

A controversy surrounding the "tunnelling time problem" stems from the seeming inability of quantum mechanics to provide, in the usual way, a definition of the duration a particle is supposed to spend in a given region of space. For this reason the problem is often approached from an "operational" angle. Typically, one tries to mimic, in a quantum case, an experiment which yields the desired result for a classical particle. One such approach is based on the use of a Larmor cl...

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Extended Wigner's friend problem and the internal consistency of standard quantum mechanics

February 17, 2021

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D. Sokolovski, A. Matzkin
Quantum Physics

The extended Wigner's friend problem deals with two Observers each measuring a sealed laboratory in which a friend is making a quantum measurement. We investigate this problem by relying on the basic rules of quantum mechanics as exposed by Feynman in the well-known "Feynman Lectures on Physics". Although recent discussions have suggested that the extended Wigner's friend problem cannot consistently be described by quantum theory, we show here that a straightforward applicati...

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On A New Formulation of Micro-phenomena: Quantum Paradoxes And the Measurement Problem

October 6, 2008

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Afshin Shafiee
Quantum Physics

As a serious attempt for constructing a new foundation for describing micro-incidents from a local causal standpoint, I explained before that each micro-entity can be assumed to be composed of a probability field joined to a particle (called a particle-field or PF system) which is endowed with energy, having an objective character. In this essay, some odd quantum phenomena including the tunneling effect, the measurement problem and the EPR theorem are reexamined in detail fro...

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The fundamental obscurity in quantum mechanics. Could the problem be considered universal?

December 20, 2010

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A. V. Nikulov
Quantum Physics

The contemporary controversy about the fundamental obscurity in quantum mechanics keeps on the old one about the aim of science, which was between the founders of the quantum theory. The orthodox quantum mechanics could be created only at the cost of renunciation of reality as the aim of natural science. The description only of phenomena, i.e. results of observation, should not be universal if no one believes that these phenomena are manifestation of a unique reality. Such be...

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"Nobody understands quantum mechanics." Why?

June 24, 2017

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Nicolay V. Lunin
General Physics

The well known and oft-quoted Feynman's expression, entered the title, leading at a loss and even being objectionable, has not yet a clear explanation. The hidden parameters problem in quantum mechanics is considered here on the base of group-theoretic approach which includes the complete set of observables indispensably. The last ones are the bilinear Hermitian forms constructed from the Schroedinger equation solutions and its first derivatives, they satisfy the algebraic co...

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Making better sense of quantum mechanics

September 5, 2018

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N. David Mermin
History and Philosophy of Ph...

We still lack any consensus about what one is actually talking about as one uses quantum mechanics. There is a gap between the abstract terms in which the theory is couched and the phenomena the theory enables each of us to account for so well. Because it has no practical consequences for how we each use quantum mechanics to deal with physical problems, this cognitive dissonance has managed to coexist with the quantum theory from the very beginning. The absence of conceptual ...

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