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arxiv: 2507.13582 · v1 · pith:JOOOQP2Pnew · submitted 2025-07-18 · ⚛️ physics.hist-ph · hep-ex· hep-ph· quant-ph

Historical origins of quantum entanglement in particle physics

Yu Shi This is my paper

Pith reviewed 2026-05-19 04:58 UTC · model grok-4.3

classification ⚛️ physics.hist-ph hep-exhep-phquant-ph
keywords quantum entanglementEPR paradoxhistory of particle physicsWu-Shaknov experimentkaon pairsBell inequalityselection rules
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The pith

Bohm and Aharonov recognized in 1957 that the 1949 Wu-Shaknov experiment realized the first spatially separated EPR correlation.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper traces the early history of quantum entanglement in particle physics through primary sources and calculations from the late 1940s and 1950s. It establishes that Bohm and Aharonov in 1957 identified the Wu-Shaknov experiment as the first controlled realization of spatially separated entanglement, correcting an earlier proposal by Wheeler. The work further shows that Goldhaber, Lee and Yang in 1958 wrote the first entangled states for kaon pairs, extending the concept beyond photons to internal degrees of freedom in high-energy particles.

Core claim

The central claim is that the 1949 Wu-Shaknov experiment, with theoretical backing from Ward, Price, Snyder, Pasternack and Hornbostel, provided the first explicit experimental realization of the Einstein-Podolsky-Rosen correlation in a controlled particle-physics setting, as noted by Bohm and Aharonov in 1957, while Goldhaber, Lee and Yang introduced the first entangled kaon-pair states in 1958.

What carries the argument

Chronological reconstruction of primary calculations and publications from 1949 to 1960 that link the Wu-Shaknov setup to EPR correlations and extend entanglement to neutral kaon pairs via selection rules and two-state descriptions.

If this is right

  • The Wu-Shaknov data already contained measurable EPR correlations before Bell's inequality was formulated.
  • Goldhaber-Lee-Yang kaon-pair states supplied the first example of entanglement in internal degrees of freedom of unstable particles.
  • Post-1964 attempts to test Bell inequalities with particle experiments were directly motivated by these earlier realizations.
  • Lee and Yang's 1960 unpublished discussion already explored observable consequences of neutral-kaon entanglement.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Similar re-examination of other pre-1960 particle experiments could uncover additional early instances of recognized quantum correlations.
  • The timeline suggests entanglement ideas entered high-energy physics through selection-rule calculations rather than through abstract foundational debates alone.
  • Modern kaon experiments might benefit from revisiting the 1958 entangled-state formalism for fresh tests of quantum mechanics.

Load-bearing premise

That the 1957 Bohm-Aharonov analysis together with the cited calculations and 1958 Goldhaber-Lee-Yang work fully and accurately represent the historical record without earlier explicit identifications.

What would settle it

Finding a publication or private note before 1957 that explicitly states the Wu-Shaknov experiment realizes spatially separated EPR entanglement would disprove the claim that this recognition first occurred in 1957.

Figures

Figures reproduced from arXiv: 2507.13582 by Yu Shi.

Figure 1
Figure 1. Figure 1: FIG. 1. From electron-positron annihilation, two photons are created moving to opposite direc [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
read the original abstract

In this paper, the historical origins of quantum entanglement in particle physics are systematically and thoroughly investigated. 1957, Bohm and Aharonov noted that the Einstein-Podolsky-Rosen correlation had been experimentally realised in the 1949 experiment of Chien-Shiung Wu and Shaknov. This was the first time in history that spatially separated quantum entanglement was explicitly realised in a controlled experiment. Wheeler first proposed such an experiment as a test of quantum electrodynamics, but his calculation was in error; the correct theoretical calculations came from Ward and Price, as well as from Snyder, Pasternack and Hornbostel, and the result was in accordance with Yang's 1949 selection rule. After the publication of Bell's inequality in 1964, it was considered whether it could be tested by using the Wu-Shaknov experiment. This gave an impetus to the field, and a new experiment was done by Wu's group, though it was not successful as a test of Bell inequality violation. In 1957, Tsung-Dao Lee, Reinhard Oehme and Chen Ning Yang established the quantum mechanical description of the kaons and found that the neutral kaon is a two-state system. In 1958, based on an approach similar to Yang's 1949 selection rule, Goldhaber, Lee and Yang were the first to write down the entangled states of kaon pairs, in which a single kaon can be charged or neutral. This gave, for the first time, quantum entanglement of internal degrees of freedom of high-energy particles other than photons. In 1960, as unpublished work, Lee and Yang discussed the consequences of quantum entanglement of neutral kaon pairs. We also describe several physicists in the past, especially Ward. A Chinese version of this paper was published in early 2023.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript reconstructs the historical origins of quantum entanglement concepts in particle physics. It claims that Bohm and Aharonov in 1957 first explicitly identified the 1949 Wu-Shaknov positronium annihilation experiment as realizing EPR correlations (spatially separated entanglement), following Wheeler's QED-test proposal and corrections by Ward, Price, Snyder et al. that aligned with Yang's 1949 selection rule. It further traces post-1964 Bell-inequality considerations leading to a new Wu-group experiment, the 1957 Lee-Oehme-Yang two-state description of neutral kaons, the 1958 Goldhaber-Lee-Yang entangled kaon-pair states, and unpublished 1960 Lee-Yang work on neutral-kaon entanglement consequences, while noting contributions from physicists such as Ward.

Significance. If the historical attributions hold, the paper supplies a coherent timeline that situates early particle-physics experiments and kaon theory within the broader development of entanglement ideas, bridging pre-Bell QED tests with later Bell-test motivations and extending entanglement discussions beyond photons to internal degrees of freedom of high-energy particles. It thereby fills a documented gap in the historiography of quantum mechanics in high-energy contexts and credits specific early calculations and selection rules.

major comments (2)
  1. [Abstract and introduction] Abstract and introduction: the central claim that the 1949 Wu-Shaknov experiment constituted the 'first time in history that spatially separated quantum entanglement was explicitly realised in a controlled experiment' rests on the 1957 Bohm-Aharonov note without direct quotation, side-by-side comparison to the 1949 primary sources, or explicit discussion of whether the entanglement framing was contemporaneous or retrospective; this interpretive step is load-bearing for the 'explicit' and 'first' qualifiers.
  2. [Abstract and introduction] The manuscript does not describe the methods used to verify archival sources or to assess potential gaps in the cited references (e.g., Wheeler's original proposal versus the corrected calculations by Ward et al.), which directly affects the reliability of the reconstructed sequence presented in the abstract and subsequent sections.
minor comments (2)
  1. [Abstract] The final sentence noting the prior Chinese version (early 2023) should include a full citation with journal or repository details for proper scholarly attribution.
  2. Figure or timeline clarity: if a chronological diagram of events is present, ensure all cited works (Ward, Price, Snyder et al., Goldhaber-Lee-Yang) are explicitly labeled with years and key contributions.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading of the manuscript and for the constructive comments, which help clarify the presentation of our historical reconstruction. We address each major comment below and indicate the revisions we will make.

read point-by-point responses

  1. Referee: [Abstract and introduction] Abstract and introduction: the central claim that the 1949 Wu-Shaknov experiment constituted the 'first time in history that spatially separated quantum entanglement was explicitly realised in a controlled experiment' rests on the 1957 Bohm-Aharonov note without direct quotation, side-by-side comparison to the 1949 primary sources, or explicit discussion of whether the entanglement framing was contemporaneous or retrospective; this interpretive step is load-bearing for the 'explicit' and 'first' qualifiers.

    Authors: We agree that the interpretive attribution requires stronger textual support. The manuscript bases the claim on the explicit statement in Bohm and Aharonov (1957) that the Wu-Shaknov experiment realized EPR correlations. In the revised version we will insert direct quotations from the 1957 note, juxtapose them with the relevant 1949 experimental and theoretical passages (including Yang's selection rule and the corrected calculations), and add a brief discussion noting that the entanglement framing was supplied retrospectively by Bohm and Aharonov while the original experiment was motivated as a QED test. These additions will appear in both the abstract and the introduction. revision: yes

  2. Referee: [Abstract and introduction] The manuscript does not describe the methods used to verify archival sources or to assess potential gaps in the cited references (e.g., Wheeler's original proposal versus the corrected calculations by Ward et al.), which directly affects the reliability of the reconstructed sequence presented in the abstract and subsequent sections.

    Authors: We accept that a short statement on source verification would improve transparency. The reconstruction draws on published primary literature rather than unpublished archives, and discrepancies such as Wheeler's initial error were identified by direct comparison with the subsequent corrections of Ward, Price, Snyder et al. In the revised manuscript we will add a concise paragraph in the introduction describing the literature-search approach, the cross-checking of calculations against Yang's 1949 rule, and the absence of contradictory contemporary sources that would alter the timeline. revision: yes

Circularity Check

0 steps flagged

No circularity: historical narrative rests on external citations without self-referential reduction

full rationale

The paper contains no equations, derivations, fitted parameters, or ansatzes. Its central claims consist of historical attributions (e.g., Bohm-Aharonov 1957 noting the 1949 Wu-Shaknov experiment, Yang 1949 selection rule, Goldhaber-Lee-Yang 1958 entangled kaon states) that are grounded in citations to independently published external works. These citations function as external benchmarks rather than self-citations whose content is presupposed by the present paper. No step reduces by construction to the paper's own inputs; the sequence of events is presented as a factual reconstruction supported by primary sources outside the manuscript. Per the evaluation criteria, this qualifies as a self-contained historical account with score 0.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

This is a historical review paper. No free parameters, mathematical axioms, or invented physical entities are introduced. The narrative rests on standard historical scholarship practices and the assumption that cited sources accurately reflect events.

axioms (1)
  • domain assumption Historical events, publications, and attributions are accurately represented based on available records and prior literature.
    The central timeline and claims of 'firsts' depend on the completeness and correctness of the author's selection and interpretation of historical documents.

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Reference graph

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