@quant_phys

Nuts and bolts of quantum mechanics

 London, UK
quantphys.com
Joined March 2020
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Quantum Physics Corner
@quant_physOct 13
Magnetic tuning of quantum backflow: Schrödinger vs Pauli system doi.org/10.1103/3jq6-ql82

Magnetic tuning of quantum backflow: Schr\"odinger vs Pauli system

Probability backflow is investigated for charged spin-$1/2$ particles in a uniform magnetic field within the lowest-Landau-level approximation. While single-mode Landau states exhibit only weak and...

journals.aps.org
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Quantum Physics Corner
@quant_physSep 29
How many photons can a molecule scatter before its coherence is lost? arxiv.org/abs/2609.33475

How many photons can a molecule scatter before its coherence is lost?

Molecular qubits held in conservative optical traps may lose coherence when they scatter photons from the trapping lasers. The rate for this process has two parts, one equal to the mean Raman...

arxiv.org
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Quantum Physics Corner
@quant_physSep 22
Quantum scattering by intersecting δ-potential barriers: from Gaudin's kaleidoscope to quantum Galperin billiards arxiv.org/abs/2609.23406

Quantum scattering by intersecting δ-potential barriers: from...

We develop a general framework for the scattering of a plane wave by a class of Gaudin kaleidoscope models: straight $δ$-potential barriers intersecting at a common point. The projected...

arxiv.org
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Quantum Physics Corner
@quant_physSep 21
Entanglement without quantum mechanics: Operational constraints on the quantum signature doi.org/10.1103/xdz9-x3zj

Entanglement without quantum mechanics: Operational constraints on the quantum signature

Quantum entanglement is defined as nonseparability of density operators, yet experimental phase-space statistics alone cannot distinguish classical from quantum sources, so classical data can be used...

journals.aps.org
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Quantum Physics Corner
@quant_physSep 18
Suzuki-Trotter Decompositions and other Methods for Quantum Time Evolution arxiv.org/abs/2609.19184

Suzuki-Trotter Decompositions and other Methods for Quantum Time Evolution

(Suzuki-)Trotter decompositions, splitting methods, (Lie) product formulae... The most common numerical methods for the time evolution of quantum systems come with many names. And they are used...

arxiv.org
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Quantum Physics Corner
@quant_physSep 15
Open Quantum Systems arxiv.org/abs/2609.13863

Open Quantum Systems

Open quantum systems describe quantum systems that interact unavoidably with their environments. These notes introduce the physical origins of decoherence and dissipation in realistic settings,...

arxiv.org
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Quantum Physics Corner
@quant_physSep 14
Quantum neural network equipped with backpropagation on a qudit processor arxiv.org/abs/2609.12500

Quantum neural network equipped with backpropagation on a qudit processor

Quantum neural networks (QNNs), one of the fundamental algorithms in quantum machine learning, have been widely used in classification and identification tasks. However, the capabilities of QNNs...

arxiv.org
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Quantum Physics Corner
@quant_physSep 11
Quantum States Cannot Hide Their Origin physics.aps.org/articles/v19…

Quantum States Cannot Hide Their Origin

Theorists find a persistent signature of a chaotic quantum system’s initial state, implying a memory effect—called a quantum birthmark—that resists thermodynamic equilibration.

physics.aps.org
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Quantum Physics Corner retweeted
Steven Strogatz
@stevenstrogatzSep 8
While walking to work, I just had a chat with ChatGPT to make sure I understood what the claimed singular solution to Navier-Stokes would mean *physically.* Here's a tweet thread it generated for me. Hope you find it helpful. (I rewrote it a bit to clarify what's surprising.)
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Quantum Physics Corner
@quant_physSep 7
How physicists disagree on the meaning of entropy doi.org/10.1119/1.3536633

How physicists disagree on the meaning of entropy

Discussions of the foundations of statistical mechanics, how they lead to thermodynamics, and the appropriate definition of entropy have occasioned many disagre

pubs.aip.org
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Quantum Physics Corner
@quant_physAug 26
Quantum observables over time for information recovery doi.org/10.1103/schg-nl3m

Quantum observables over time for information recovery

We introduce the concept of quantum observables over time (QOOT), an operator that jointly describes two observables at two distinct time points, as a dual of the quantum state over time formalism....

journals.aps.org
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Quantum Physics Corner
@quant_physAug 25
What do position and time mean in the quantum wavefunction? arxiv.org/abs/2608.23032

What do position and time mean in the quantum wavefunction?

The notation $ψ(x,t)$ is among the first pieces of quantum mechanics that students learn. It is also among the easiest to over-interpret. Because $x$ and $t$ occur as arguments of the same...

arxiv.org
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Quantum Physics Corner
@quant_physAug 24
Conservation Laws in the Many-Worlds Interpretation of Quantum Mechanics doi.org/10.1093/978019892927…

Conservation Laws in the Many-Worlds Interpretation of Quantum Mechanics

Abstract. Although the basic approach of the many-worlds interpretation is that the ontology of our universe is a unitarily evolving highly entangled wavef

academic.oup.com
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Quantum Physics Corner
@quant_physAug 23
Quantum Hacking Coming Sooner than Expected physics.aps.org/articles/v19…

Quantum Hacking Coming Sooner than Expected

New estimates suggest that some crypto-security systems may soon become vulnerable to quantum-powered break-ins.

physics.aps.org
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Quantum Physics Corner
@quant_physAug 21
Teleporting More Quantum States at Once physics.aps.org/articles/v19…

Teleporting More Quantum States at Once

Researchers have demonstrated the quantum teleportation of a 100-pixel image by a method that could help to scale up quantum networks.

physics.aps.org
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Quantum Physics Corner
@quant_physAug 21
[...] my guess for the outcome of the active search for a satisfactory understanding of quantum mechanics, is that some different “big picture” will arise, which is not “many worlds,” but which still upholds Hugh Everett’s conviction that paranormal influences will not overrule the Schrödinger equation. — Charles W. Misner
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Quantum Physics Corner
@quant_physAug 18
Quantum Wave-Particle Duality in Free-Electron--Free-Electron Entanglement arxiv.org/abs/2608.16292

Quantum Wave-Particle Duality in Free-Electron--Free-Electron Entanglement

Point-particle descriptions of electron-electron interaction omit the coherent longitudinal extent of a free-electron quantum wave packet (QEW). A relativistic two-electron wave-packet theory...

arxiv.org
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Quantum Physics Corner
@quant_physAug 17
Maximizing Nonclassicality of Massive Objects via Quantum Zeno Effect arxiv.org/abs/2608.13942

Maximizing Nonclassicality of Massive Objects via Quantum Zeno Effect

For testing quantum mechanics in the macroscopic domain, a major challenge is to devise effective means for enhancing the observable nonclassical signatures despite the ubiquitous presence of...

arxiv.org
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Quantum Physics Corner
@quant_physAug 11
The original Wigner's friend scenarios doi.org/10.1119/5.0303052

The original Wigner's friend scenarios

Editor's Note: Philosophical questions about the foundations of quantum mechanics continue to surface today. The Wigner's friend paradox imagines an observer in

pubs.aip.org
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Quantum Physics Corner
@quant_physJul 27
Ballistic electron transport described by a generalized Schrödinger equation doi.org/10.1088/1751-8121/ae…

Ballistic electron transport described by a generalized Schrödinger equation

Ballistic electron transport described by a generalized Schrödinger equation, Aliffi, Giulia Elena, Nastasi, Giovanni, Romano, Vittorio

iopscience.iop.org
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