scholarly journals Do Weak Values Capture the Complete Truth About the Past of a Quantum Particle?

2021 ◽  
Author(s):  
Rajendra Singh Bhati ◽  
Arvind Arvind
Keyword(s):  
Quantum Particle ◽  
Weak Values ◽  
The Past

scholarly journals Past of a particle in an entangled state

2017 ◽  
Vol 15 (08) ◽  
pp. 1740019 ◽  
Author(s):  
Dilip Paneru ◽  
Eliahu Cohen
Keyword(s):  
Time Evolution ◽  
Single Particle ◽  
Quantum Particle ◽  
Higher Order ◽  
Entangled State ◽  
Entire System ◽  
Single Quantum ◽  
Single Particles ◽  
Top Down ◽  
The Past

Vaidman has proposed a controversial criterion for determining the past of a single quantum particle based on the “weak trace” it leaves. We here consider more general examples of entangled systems and analyze the past of single, as well as pairs of entangled pre- and postselected particles. Systems with nontrivial time evolution are also analyzed. We argue that in these cases, examining only the single-particle weak trace provides information which is insufficient for understanding the system as a whole. We therefore suggest to examine, alongside with the past of single particles, also the past of pairs, triplets and eventually the entire system, including higher-order, multipartite traces in the analysis. This resonates with a recently proposed top-down approach by Aharonov, Cohen and Tollaksen for understanding the structure of correlations in pre- and postselected systems.

scholarly journals The Quantum Cheshire Cat Effect in the Presence of Decoherence

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Monika Richter ◽  
Bartosz Dziewit ◽  
Jerzy Dajka
Keyword(s):  
Energy Exchange ◽  
Quantum Particle ◽  
Quantum Effects ◽  
Information Loss ◽  
Weak Values ◽  
Exact Results ◽  
Internal Property ◽  
Rate Of Dissipation

Even the subtle and apparently strange quantum effects can sometimes survive otherwise lethal influence of an omnipresent decoherence. We show that an archetypal quantum Cheshire Cat, a paradox of a separation between a position of a quantum particle, a photon, and its internal property, the polarization, in a two-path Mach–Zehnder setting, is robust to decoherence caused by a bosonic infinite bath locally coupled to the polarization of a photon. Decoherence affects either the cat or its grin depending on which of the two paths is noisy. For a pure decoherence, in an absence of photon–environment energy exchange, we provide exact results for weak values of the photon position and polarization indicating that the information loss affects the quantum Cheshire Cat only qualitatively and the paradox survives. We show that it is also the case beyond the pure decoherence for a small rate of dissipation.

scholarly journals Feynman Paths and Weak Values

2018 ◽  
Author(s):  
Robert Flack ◽  
Basil Hiley
Keyword(s):  
Quantum Particle ◽  
Transition Probability ◽  
Individual Particle ◽  
Probability Amplitude ◽  
Weak Values ◽  
Quantum Processes ◽  
Weak Value ◽  
The Mean ◽  
Feynman Paths ◽  
The Relationship

There has been a recent revival of interest in the notion of a `trajectory' of a quantum particle. In this paper we detail the relationship between Dirac's ideas, Feynman paths and the Bohm approach. The key to the relationship is the weak value of the momentum which Feynman calls a transition probability amplitude. With this identification we are able to conclude that a Bohm `trajectory' is the average of an ensemble of actual individual stochastic Feynman paths. This implies that they can be interpreted as the mean momentum flow of a set of individual quantum processes and not the path of an individual particle. This enables us to give a clearer account of the experimental two-slit results of Kocsis {\em et al.}}

Observations of the continuum near the galactic centre

1967 ◽  
Vol 31 ◽  
pp. 405
Author(s):  
F. J. Kerr
Keyword(s):  
Galactic Centre ◽  
The Past ◽  
Centre Region ◽  
The Continuum

A continuum survey of the galactic-centre region has been carried out at Parkes at 20 cm wavelength over the areal11= 355° to 5°,b11= -3° to +3° (Kerr and Sinclair 1966, 1967). This is a larger region than has been covered in such surveys in the past. The observations were done as declination scans.

The Origin of the Moon and its Relationship to the Origin of the Solar System

1962 ◽  
Vol 14 ◽  
pp. 133-148 ◽  
Author(s):  
Harold C. Urey
Keyword(s):  
Solar System ◽  
The Moon ◽  
The Past ◽  
The Earth ◽  
Short Period ◽  
Origin Of The Moon

During the last 10 years, the writer has presented evidence indicating that the Moon was captured by the Earth and that the large collisions with its surface occurred within a surprisingly short period of time. These observations have been a continuous preoccupation during the past years and some explanation that seemed physically possible and reasonably probable has been sought.

On The Possibility of an Autonomous History of Modern Southeast Asia

1961 ◽  
Vol 2 (2) ◽  
pp. 73-105 ◽  
Author(s):  
John R. W. Small
Keyword(s):  
Southeast Asia ◽  
Contemporary History ◽  
The Past ◽  
History Of

It is generally accepted that history is an element of culture and the historian a member of society, thus, in Croce's aphorism, that the only true history is contemporary history. It follows from this that when there occur great changes in the contemporary scene, there must also be great changes in historiography, that the vision not merely of the present but also of the past must change.

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