Weekly Papers on Quantum Foundations (15)

The quantum gravity seeds for laws of nature 

from physics.hist-ph by Vincent Lam, Daniele OritiFri Apr 19 2024 10:13:01 (1 day)# 1.

arXiv:2404.12248v1 Announce Type: new Abstract: We discuss the challenges that the standard (Humean and non-Humean) accounts of laws face within the framework of quantum gravity where space and time may not be fundamental. This paper identifies core (meta)physical features that cut across a number of quantum gravity approaches and formalisms and that provide seeds for articulating updated conceptions that could account for QG laws not involving any spatio-temporal notions. To this aim, we will in particular highlight the constitutive roles of quantum entanglement, quantum transition amplitudes and quantum causal histories. These features also stress the fruitful overlap between quantum gravity and quantum information theory.

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Area laws from classical entropies 

from quant-ph by Tobias HaasFri Apr 19 2024 10:12:44 (1 day)# 2.

arXiv:2404.12320v1 Announce Type: new Abstract: The area law-like scaling of local quantum entropies is the central characteristic of the entanglement inherent in quantum fields, many-body systems, and spacetime. Whilst the area law is primarily associated with the entanglement structure of the underlying quantum state, we here show that it equally manifests in classical entropies over measurement distributions when vacuum contributions dictated by the uncertainty principle are subtracted. Using the examples of the Gaussian ground and thermal states, but also the non-Gaussian particle state of a relativistic scalar field, we present analytical and numerical area laws for the entropies of various distributions and unveil how quantities of widespread interest such as the central charge and the (local) temperature are encoded in classical observables. With our approach, quantum entropies are no longer necessary to probe quantum phenomena, thereby rendering area laws and other quantum features directly accessible to theoretical models of high complexity as well as state-of-the-art experiments.

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Is Wave Function Collapse Necessary? Explaining Quantum Nondemolition Measurement of a Spin Qubit within Linear Evolution 

from PRL by Harry E. Dyte, George Gillard, Santanu Manna, Saimon F. Covre da Silva, Armando Rastelli, and Evgeny A. ChekhovichFri Apr 19 2024 06:00:00 (1 day)# 3.

Author(s): Harry E. Dyte, George Gillard, Santanu Manna, Saimon F. Covre da Silva, Armando Rastelli, and Evgeny A. Chekhovich

The measurement problem dates back to the dawn of quantum mechanics. Here, we measure a quantum dot electron spin qubit through off-resonant coupling with a highly redundant ancilla, consisting of thousands of nuclear spins. Large redundancy allows for single-shot measurement with high fidelity ≈99.…

[Phys. Rev. Lett. 132, 160804] Published Fri Apr 19, 2024

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Non-Spatial Matters: On the Possibility of Non-Spatial Material Objects 

from philsciThu Apr 18 2024 06:40:22 (2 days)# 4.

Davis, Cruz (2024) Non-Spatial Matters: On the Possibility of Non-Spatial Material Objects. UNSPECIFIED.

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The emergence of spacetime: what role for functionalism? 

from philsciThu Apr 18 2024 06:39:21 (2 days)# 5.

Margoni, Emilia and Oriti, Daniele (2024) The emergence of spacetime: what role for functionalism? [Preprint]

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Gauge theory is about the geometry of internal spaces 

from physics.hist-ph by Henrique GomesWed Apr 17 2024 12:35:15 (2 days)# 6.

arXiv:2404.10461v1 Announce Type: cross Abstract: In general relativity, the strong equivalence principle is underpinned by a geometrical interpretation of fields on spacetime: all fields and bodies probe the same geometry. This geometric interpretation implies that the parallel transport of all spacetime tensors and spinors is dictated by a single affine connection. Can something similar be said about gauge theory? Agreed, in gauge theory different symmetry groups rule the interactions of different types of charges, so we cannot expect to find the same kind of universality found in the gravitational case. Nonetheless, the parallel transport of all the fields that are charged under the same symmetry group is dictated by a single ‘gauge connection’, and they all transform jointly under a gauge transformation. Is this kind of ‘restricted universality’ as geometrically underpinned as in general relativity? Here I argue that it is. The key difference is that the gauge geometry concerns ‘internal’, as opposed to ‘external’, spaces. The gauge symmetry of the standard model is thus understood as merely the automorphism group of an internal geometric structure — $C^3\otimes C^2\otimes C^1$ endowed with an orientation and canonical inner product — in the same way as spacetime symmetries (such as Poincare transformations), are understood as the automorphism group of an external geometric structure (respectively, a Minkowski metric). And the Ehresmann connection can then be understood as determining parallelism for this internal geometry.

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The Black Hole Idealization Paradox 

from philsciTue Apr 16 2024 23:51:23 (3 days)# 7.

Ryder, Dominic J. (2024) The Black Hole Idealization Paradox. [Preprint]

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On Coordinates and Spacetime Structure 

from philsciTue Apr 16 2024 23:50:25 (3 days)# 8.

Barrett, Thomas William and Manchak, JB (2024) On Coordinates and Spacetime Structure. [Preprint]

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Physical Theory and Physical Possibility 

from philsciTue Apr 16 2024 23:48:01 (3 days)# 9.

Baron, Samuel and Le Bihan, Baptiste and Read, James (2024) Physical Theory and Physical Possibility. [Preprint]

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Quantization and the Preservation of Structure across Theory Change 

from philsciTue Apr 16 2024 23:44:53 (3 days)# 10.

Feintzeig, Benjamin (2024) Quantization and the Preservation of Structure across Theory Change. [Preprint]

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Timeless order 

from nature-physicsMon Apr 15 2024 20:00:00 (4 days)# 11.

Nature Physics, Published online: 16 April 2024; doi:10.1038/s41567-024-02488-yEighty years on from the publication of Erwin Schrödinger’s interdisciplinary analysis on the origin of order in living organisms — What is Life? — we look at how physicists and biologists are approaching the topic today.

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Creative and geometric times in physics, mathematics, logic, and philosophy 

from philsciSun Apr 14 2024 17:10:12 (5 days)# 12.

Del Santo, Flavio and Gisin, Nicolas (2024) Creative and geometric times in physics, mathematics, logic, and philosophy. [Preprint]

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A New Approach to Understanding Quantum Mechanics: Illustrated Using a Pedagogical Model over Z2 

from philsciSun Apr 14 2024 17:10:07 (5 days)# 13.

Ellerman, David (2024) A New Approach to Understanding Quantum Mechanics: Illustrated Using a Pedagogical Model over Z2. Applied Math, 4 (2). 468-494..

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