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Junjie Liu and Hanlin Nie
Fri Oct 13 2023 18:00:00 (16 hours)
# 1.
Author(s): Junjie Liu and Hanlin Nie
The authors establish universal Landauer-like inequalities derived from the first law of thermodynamics, offering a robust framework for constraining the energetic costs of quantum processes in diverse environments. The study applies these general inequalities to two illustrative scenarios: a dissipative quantum state preparation setup and a quantum information erasure model.
[Phys. Rev. A 108, L040203] Published Fri Oct 13, 2023
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Sixia Yu, Ya-Li Mao, Chang Niu, Hu Chen, Zheng-Da Li, and Jingyun Fan
Fri Oct 13 2023 18:00:00 (16 hours)
# 2.
Author(s): Sixia Yu, Ya-Li Mao, Chang Niu, Hu Chen, Zheng-Da Li, and Jingyun Fan
We establish rigorously in this work a measurement uncertainty relation (MUR) for three unbiased qubit observables, which was previously shown to hold true under some presumptions. The triplet MUR states that the uncertainty, which is quantified by the total statistical distance between the target o…
[Phys. Rev. A 108, 042208] Published Fri Oct 13, 2023
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Ya-Li Mao, Hu Chen, Chang Niu, Zheng-Da Li, Sixia Yu, and Jingyun Fan
Fri Oct 13 2023 18:00:00 (16 hours)
# 3.
Author(s): Ya-Li Mao, Hu Chen, Chang Niu, Zheng-Da Li, Sixia Yu, and Jingyun Fan
Heisenberg-type measurement uncertainty relations (MURs) of two quantum observables are essential for contemporary research in quantum foundations and quantum information science. Going beyond, here we report the first experimental study of MUR of three quantum observables. We establish rigorously M…
[Phys. Rev. Lett. 131, 150203] Published Fri Oct 13, 2023
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Francesco Vissani
Fri Oct 13 2023 09:42:43 (1 day)
# 4.
We retrace the first steps towards understanding neutrinos, particles predicted by Pauli in 1930 to avoid a supposed violation of time-translation symmetry. Despite the tendency to reduce the whole story to his intuition and the skill of Reines & Cowan, according to history great strides were made in thirties thanks to precious intellectual tools that combined ideas and mathematics. I refer primarily to the contribution of Fermi, who proposed in 1933 a theory in which matter particles can appear and disappear, prototypical of those at the basis of today’s particle physics. This theory, despite its limitations, led physicists towards the observation of neutrinos, paved the way for further developments – e.g., it anticipated the characteristic of crossing symmetry – and had an impressive scientific legacy. We reconstruct the chain of arguments in the most accessible terms for a modern reader, emphasising the role of theoretical physics and reflecting on some alternative assessments of Fermi’s contribution. A few technical remarks are collected in the appendix.
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Jochen Szangolies
Fri Oct 13 2023 09:42:42 (1 day)
# 5.
The Frauchiger-Renner argument aims to show that `quantum theory cannot consistently describe the use of itself’: in many-party settings where agents are themselves subject to quantum experiments, agents may make predictions that contradict observations. Here, we introduce a simplified setting using only three agents, that is independent of the initial quantum state, thus eliminating in particular any need for entanglement, and furthermore does not need to invoke any final measurement and resulting collapse. Nevertheless, the predictions and observations made by the agents cannot be integrated into a single, consistent account. We propose that the existence of this sort of \emph{Rashomon effect}, i.e. the impossibility of uniting different perspectives, is due to failing to account for the limits put on the information available about any given system as encapsulated in the notion of an \emph{epistemic horizon}.
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Sam Leutheusser and Hong Liu
Thu Oct 12 2023 18:00:00 (1 day)
# 6.
Author(s): Sam Leutheusser and Hong Liu
In a series of two papers, the authors explore the holographic duality between an eternal AdS black hole in the bulk and two copies of the boundary CFT in the thermal field double state. They provide an explicit construction in the boundary theory of an evolution operator for a bulk in-falling observer, thus making manifest the boundary emergence of the black hole horizons, the interiors, and the associated causal structure. They also elucidate that the emergence of the sharp bulk event horizon is related to the infinite N limit of the boundary theory.
[Phys. Rev. D 108, 086020] Published Thu Oct 12, 2023
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Thu Oct 12 2023 02:24:08 (2 days)
# 7.
Suárez, Mauricio and Sánchez-Gómez, Pedro J. (2023) Chemical Reactivity: The Propensity View. [Preprint]
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Thu Oct 12 2023 02:23:05 (2 days)
# 8.
Wallace, David (2023) Philosophy of Quantum Mechanics. [Preprint]
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Thu Oct 12 2023 02:21:03 (2 days)
# 9.
Kastner, Ruth (2023) The Arrow of Time is Alive and Well but Forbidden Under the Received View of Physics. [Preprint]
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Charles Day
Wed Oct 11 2023 18:00:00 (2 days)
# 10.
Author(s): Charles Day
Two different experiments on two different transition metals reveal that a current of electron orbital angular momentum flows in response to an electric field.
[Physics 16, s143] Published Wed Oct 11, 2023
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Ivan Šupić, Jean-Daniel Bancal, and Nicolas Brunner
Wed Oct 11 2023 18:00:00 (2 days)
# 11.
Author(s): Ivan Šupić, Jean-Daniel Bancal, and Nicolas Brunner
It is well known that the effect of quantum nonlocality, as witnessed by violation of a Bell inequality, can be observed even when relaxing the assumption of measurement independence, i.e., allowing for the source to be partially correlated with the choices of measurement settings; however, what is …
[Phys. Rev. A 108, 042207] Published Wed Oct 11, 2023
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Mathias Van Den Bossche, Philippe Grangier
Wed Oct 11 2023 10:09:19 (3 days)
# 12.
We argue that a clear view on quantum mechanics is obtained by considering that the unicity of the macroscopic world is a fundamental postulate of physics, rather than an issue that must be mathematically justified or demonstrated. This postulate allows a framework in which quantum mechanics can be constructed, in a complete mathematically consistent way. This is made possible by using general operator algebras to extend the mathematical description of the physical world towards macroscopic systems. Such an approach goes beyond the usual type I operator algebras used in standard textbook quantum mechanics. This avoids a major pitfall, which is the temptation to make the usual type I formalism ‘universal’. This may also provide a meta-framework for both classical and quantum physics, shedding a new light on ancient conceptual antagonisms, and clarifying the status of quantum objects. Beyond exploring remote corners of quantum physics, we expect these ideas to be helpful to better understand and develop quantum technologies.
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Hirokazu Maruoka
Wed Oct 11 2023 10:09:18 (3 days)
# 13.
In this paper, it is demonstrated that there is a parallelism between the relational interpretation of Rovelli and the interpretation of soft matter based on intermediate asymptotics. The general interpretation of physics strongly assumes the duality of the observer and the world, and the uniqueness of the world though the relational interpretation suggested different conclusions: {\ it no properties, no interaction}, and {\ it facts are relative}. These conclusions are seemingly counterintuitive, though this work shows that similar conclusions are found in the interpretation of soft matter based on the concept of intermediate asymptotics. The interpretation of soft matter based on intermediate asymptotics also concludes that the properties are not determined without the scale. This is due to the conclusion of intermediate asymptotics that any formalization and its interpretation are localized by the scale. It is demonstrated that the similarity between the two interpretations originated from its monism of relations. This logical structure is also compared with the works in other disciplines. This work reports the insight that the relational interpretation can be a general and fundamental concept, not the one applicable to special cases.
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Herve Zwirn
Wed Oct 11 2023 10:09:17 (3 days)
# 14.
A classification of different interpretations of the quantum formalism is examined and the concept of perspectival interpretation is presented. A perspectival interpretation implies that the truth is relative to the observer. The degree to which QBism and Convivial Solipsism are perspectival is examined and Convivial Solipsim is shown to be perspectival at a higher degree than QBism or at least than the QBism founders version.
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Marian Kupczynski
Wed Oct 11 2023 10:09:15 (3 days)
# 15.
In 1976, I met John Bell several times in CERN and we talked about a possible violation of optical theorem, purity tests, EPR paradox, Bell inequalities and their violation. I review our discussions, and explain how they were related to my earlier research. I also reproduce handwritten notes, which I gave to Bell during our first meeting and a handwritten letter he sent to me in 1982. We have never met again, but I have continued to discuss BI-CHSH inequalities and their violation in several papers. The research stimulated by Bell papers and experiments performed to check his inequalities led to several important applications of quantum entanglement in quantum information and quantum technologies. Unfortunately, it led also to extraordinary metaphysical claims and speculations about quantum nonlocality and retro-causality, which in our opinion John Bell would not endorse today. BI-CHSH inequalities are violated in physics and in cognitive science, but it neither proved the completeness of quantum mechanics nor its nonlocality. Quantum computing advantage is not due to some magical instantaneous influences between distant physical systems. Therefore one has to be cautious in drawing far-reaching philosophical conclusions from Bell inequalities.
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Francisco Caruso, Vitor Oguri, Felipe Silveira
Wed Oct 11 2023 10:09:14 (3 days)
# 16.
The hydrogen atom is supposed to be described by a generalization of Schr\”{o}dinger equation, in which the Hamiltonian depends on an iterated Laplacian and a Coulomb-like potential $r^{-\beta}$. Starting from previously obtained solutions for this equation using the $1/N$ expansion method, it is shown that new light can be shed on the problem of understanding the dimensionality of the world as proposed by Paul Ehrenfest. A surprisingly new result is obtained. Indeed, for the first time, we can understand that not only the sign of energy but also the value of the ground state energy of hydrogen atom is related to the threefold nature of space.
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Mark Buchanan
Wed Oct 11 2023 08:00:00 (3 days)
# 17.
Nature Physics, Published online: 11 October 2023; doi:10.1038/s41567-023-02236-8
The temptation of irrationality
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Wed Oct 11 2023 08:00:00 (3 days)
# 18.
Nature Physics, Published online: 11 October 2023; doi:10.1038/s41567-023-02264-4
The Ig Nobel Prize celebrates research that makes us first laugh and then think. We look at some of this year’s not so ignoble highlights.
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Wed Oct 11 2023 07:49:13 (3 days)
# 19.
Franklin, Alexander (2022) Incoherent? No, Just Decoherent: How Quantum Many Worlds Emerge. [Preprint]
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Wed Oct 11 2023 07:48:04 (3 days)
# 20.
Chen, Lu and Read, James (2023) Is the metric signature really electromagnetic in origin? [Preprint]
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Wed Oct 11 2023 07:47:34 (3 days)
# 21.
Lehmkuhl, Dennis and Röken, Christian and Doboszewski, Juliusz (2023) On Penrose’s Analogy between Curved Spacetime Regions and Optical Lenses. [Preprint]
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Wed Oct 11 2023 07:46:08 (3 days)
# 22.
Kastner, Ruth and Schlatter, Andreas (2023) Entropy cost of “Erasure” in Physically Irreversible Processes. [Preprint]
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Wed Oct 11 2023 07:42:50 (3 days)
# 23.
Cuffaro, Michael E. (2023) The Measurement Problem Is a Feature, Not a Bug–Schematising the Observer and the Concept of an Open System on an Informational, or (Neo-)Bohrian, Approach. [Preprint]
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Sun Oct 08 2023 04:31:38 (6 days)
# 24.
Filomeno, Aldo (2023) How bad is the postulation of a low entropy initial state of the universe?
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Sun Oct 08 2023 04:26:39 (6 days)
# 25.
Weinstein, Galina (2023) Navigating the Conjectural Labyrinth of the Black Hole Information Paradox. [Preprint]
Physics > General Physics
[Submitted on 7 Oct 2023]
Does the Mott problem extend to Geiger counters?
The Mott problem is a simpler version of the quantum measurement problem that asks: Is there a microscopic physical mechanism – based (explicitly or implicitly) only on Schroedinger’s equation – that explains why a single alpha particle emitted in a spherically symmetric s-wave nuclear decay produces a manifestly non-spherically-symmetric single track in a cloud chamber? I attempt here to generalize earlier work that formulated such a mechanism. The key ingredient there was identification of sites at which the cross section for ionization by a passing charged particle is near singular at ionization threshold. This near singularity arose from a Penning-like process involving molecular polarization in sub-critical vapor clusters. Here, I argue that the same Mott problem question should be asked about Geiger counters. I then define a simple experiment to determine if ionization physics similar to the cloud chamber case takes place in the mica window of a Geiger counter and explains the collimation of wavefunctions that are spherically symmetric outside the counter into linear tracks inside. The experiment measures the count rate from a radioactive point source as a function of source-window separation. I have performed a proof of concept of this experiment; results are reported here and support the near-singular-ionization picture. These results are significant in their own right, but also because they may shed light on physical mechanisms underlying the full quantum measurement problem. I illustrate this for the Stern-Gerlach experiment and a particular realization of superconducting qubits. I conclude by detailing further work required to flesh out these results more rigorously.
