# Weekly Papers on Quantum Foundations (41)

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Sat Oct 01 2022 01:40:30 (1 week)

# 17.

Price, Huw (2022) Time for Pragmatism. [Preprint]

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Sat Oct 08 2022 08:18:49 (47 minutes)

# 1.

Friedman, Daniel and Šešelja, Dunja (2022) Scientific Disagreements, Fast Science and Higher-Order Evidence. [Preprint]

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Sat Oct 08 2022 01:46:38 (7 hours)

# 3.

Stoica, Ovidiu Cristinel (2022) Counting 3d-spaces: classicality and probability in standard and many-worlds quantum mechanics from quantum-gravitational background-freedom. [Preprint]

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by

Masud Mansuripur

Thu Oct 06 2022 08:59:33 (2 days)

# 4.

Richard Feynman’s method of path integrals is based on the fundamental assumption that a system starting at a point A and arriving at a point B takes all possible paths from A to B, with each path contributing its own (complex) probability amplitude. The sum of the amplitudes over all these paths then yields the overall probability amplitude that the system starting at A would end up at B. We apply Feynman’s method to several optical systems of practical interest and discuss the nuances of the method as well as instances where the predicted outcomes agree or disagree with those of classical optical theory. Examples include the properties of beam-splitters, passage of single photons through Mach-Zehnder and Sagnac interferometers, electric and magnetic dipole scattering, reciprocity, time-reversal symmetry, the optical theorem, the Ewald-Oseen extinction theorem, far field diffraction, and the two-photon interference phenomenon known as the Hong-Ou-Mandel effect.

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Mario Fusco Girard

Thu Oct 06 2022 08:59:27 (2 days)

# 5.

It is shown that the complex phase of the Feynman propagator is a solution of the quantum Hamilton Jacobi equation

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Bruno Alexandre, João Magueijo

Thu Oct 06 2022 08:59:20 (2 days)

# 6.

We re-examine the Hartle-Hawking wave function from the point of view of a quantum theory which starts from the connection representation and allows for off-shell non-constancy of $\Lambda$ (as in unimodular theory), with a concomitant dual relational time variable. By translating its structures to the metric representation we find a non-trivial inner product rendering wave packets of Hartle-Hawking waves normalizable and the time evolution unitary; however, the implied probability measure differs significantly from the naive $|\psi|^2$. In contrast with the (monochromatic) Hartle-Hawking wave function, these packets form travelling waves with a probability peak describing de Sitter space, except near the bounce, where the incident and reflected waves interfere, transiently recreating the usual standing wave. Away from the bounce the packets get sharper both in metric and connection space, an apparent contradiction with Heisenberg’s principle allowed by the fact that the metric is not Hermitian, even though its eigenvalues are real. Near the bounce, the evanescent wave not only penetrates into the classically forbidden region but also extends into the $a^2<0$ Euclidean domain. We work out the propagators for this theory and relate them to the standard ones. The $a=0$ point (aka the “nothing”) is unremarkable, and in any case a wave function peaked therein is typically non-normalizable and/or implies a nonsensical probability for $\Lambda$ (which the Universe would preserve forever). Within this theory it makes more sense to adopt a Gaussian state in an appropriate function of $\Lambda$, and use the probability associated with the evanescent wave present near the time of the bounce as a measure of the likelihood of creation of a pair of time-symmetric semiclassical Universes.

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Onur Pusuluk

Thu Oct 06 2022 08:59:15 (2 days)

# 7.

In this paper, we argue that quantum superposition in a nonorthogonal system can be contained either between the basis states or locally inside their overlaps. The portion of quantum superposition contained within overlaps is associated with a kind of quantum indistinguishability which can also generate quantum correlations. We demonstrate that the notion of biorthogonality provides a unified framework for inter-basis quantum superposition and quantum indistinguishability which we will call \textit{genuine} quantum superposition. We also introduce faithful measures of quantum indistinguishability and genuine quantum superposition. This enables us to suggest that genuine quantum superposition is the fundamental notion of nonclassicality from which the quantum coherence and correlations can originate. Finally, we discuss the possible applications and extensions of our theory.

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Nature Physics

by

Arnau Rios

Thu Oct 06 2022 08:00:00 (2 days)

# 8.

Nature Physics, Published online: 06 October 2022; doi:10.1038/s41567-022-01782-x

Bayesian history matching is a statistical tool used to calibrate complex numerical models. Now, it has been applied to first-principles simulations of several nuclei, including 208Pb, whose properties are linked to the interior of neutron stars.

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Nature Physics

Thu Oct 06 2022 08:00:00 (2 days)

# 9.

Nature Physics, Published online: 06 October 2022; doi:10.1038/s41567-022-01765-y

The formation of bubbles at liquid–liquid interfaces is challenging to explain because gas pockets cannot be stabilized by cracks on solid impurities. Experiments show that a difference in the gas solubilities of two immiscible liquids provides a gas reservoir, which allows gas to accumulate at the interface, leading to bubble formation.

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Thu Oct 06 2022 05:32:25 (2 days)

# 10.

El Skaf, Rawad and Palacios, Patricia (2022) What Can we Learn (and not Learn) from Thought Experiments in Black Hole Thermodynamics? [Preprint]

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PRL: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

by

Lewis Wooltorton, Peter Brown, and Roger Colbeck

Wed Oct 05 2022 18:00:00 (2 days)

# 11.

Author(s): Lewis Wooltorton, Peter Brown, and Roger Colbeck

Two parties sharing entangled quantum systems can generate correlations that cannot be produced using only shared classical resources. These nonlocal correlations are a fundamental feature of quantum theory but also have practical applications. For instance, they can be used for device-independent r…

[Phys. Rev. Lett. 129, 150403] Published Wed Oct 05, 2022

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Wed Oct 05 2022 01:23:49 (3 days)

# 12.

Stoica, Ovidiu Cristinel (2022) Does quantum mechanics require “conspiracy”? [Preprint]

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Tue Oct 04 2022 02:31:22 (4 days)

# 13.

Gao, Shan (2022) On the Initial State of the Universe. [Preprint]

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PhilSci-Archive: No conditions. Results ordered -Date Deposited.

Tue Oct 04 2022 02:29:26 (4 days)

# 14.

Hubert, Mario (2022) What If Light Doesn’t Exist? The British Journal for the Philosophy of Science. ISSN 1464-3537

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PRL: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

by

Lorenzo Buffoni, Stefano Gherardini, Emmanuel Zambrini Cruzeiro, and Yasser Omar

Mon Oct 03 2022 18:00:00 (4 days)

# 15.

Author(s): Lorenzo Buffoni, Stefano Gherardini, Emmanuel Zambrini Cruzeiro, and Yasser Omar

The third law of thermodynamics, also known as the Nernst unattainability principle, puts a fundamental bound on how close a system, whether classical or quantum, can be cooled to a temperature near to absolute zero. On the other hand, a fundamental assumption of quantum computing is to start each c…

[Phys. Rev. Lett. 129, 150602] Published Mon Oct 03, 2022

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by

Charles T. Sebens

Mon Oct 03 2022 09:03:01 (5 days)

# 16.

In electrostatics, we can use either potential energy or field energy to ensure conservation of energy. In electrodynamics, the former option is unavailable. To ensure conservation of energy, we must attribute energy to the electromagnetic field and, in particular, to electromagnetic radiation. If we adopt the standard energy density for the electromagnetic field, then potential energy seems to disappear. However, a closer look at electrodynamics shows that this conclusion actually depends on the kind of matter being considered. Although we cannot get by without attributing energy to the electromagnetic field, matter may still have electromagnetic potential energy. Indeed, if we take the matter to be represented by the Dirac field (in a classical precursor to quantum electrodynamics), then it will possess potential energy (as can be seen by examining the symmetric energy-momentum tensor of the Dirac field). Thus, potential energy reappears. Upon field quantization, the potential energy of the Dirac field becomes an interaction term in the Hamiltonian operator of quantum electrodynamics.