Correlation between the States of Polarization of the Two Quanta of Annihilation Radiation

Bleuler, E.; Bradt, H.

doi:10.1103/physrev.73.1398

Cited by 48 publications

(15 citation statements)

References 2 publications

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“…Ward now attempted to generalize Schwinger's result on the electron self-energy in an external electromagnetic field to first order in α/2π to all orders. In this he was successful, although he warned (3) that ‘it must nevertheless be repeated, and the forthcoming pages will underline this fact, that these results have only a rather formal interest. The detailed calculation of particular processes remains as difficult as ever’.…”

Section: Quantum Electrodynamics and The Ward Identitymentioning

confidence: 97%

“…Ward's full calculation (3) (equation [2]) showed that the differential cross section for the process in terms of the scattering angles θ 1 and θ 2 of photons 1 and 2 and azimuthal angles ϕ 1 and ϕ 2 of their polarizations is proportional to Hanna (1948) in Cambridge and Bleuler & Bradt (1948) in Purdue then published the results of their experiments. Taking account of the specific geometry used, the result of the Purdue experiment for the asymmetry ratio was e ⊥ /e = 1.94 ± 0.37, compared with the theoretical value of e ⊥ /e = 1.7.…”

Section: Oxford and Quantum Entanglementmentioning

confidence: 99%

“…That was ‘my first lesson in quantum mechanics and in a sense my last since the rest is mere technique’ (14). More exactly, Ward realized in his thesis (3) that the wave function of photon 1 and photon 2 had to be symmetric under interchange as they satisfied Bose–Einstein statistics, and therefore the overall wave function is falsefalse|1,2> =false(falsefalse|α,β> − falsefalse|β,α>false)false(|k,−k> − |−k,k>false). …”

Section: Oxford and Quantum Entanglementmentioning

confidence: 99%

“…Ward's full calculation (3) (equation [2]) showed that the differential cross section for the process in terms of the scattering angles θ 1 and θ 2 of photons 1 and 2 and azimuthal angles φ 1 and φ 2 of their polarizations is proportional to falsefalse{(1−cosθ1)3+2falsefalse}falsefalse{(1−cosθ2)3+2falsefalse}(2−cosθ1)3(2−cosθ2)3−sin2θ1sin2θ2(2−cosθ1)2(2−cosθ2)2cos⁡2false(φ1−φ2false). …”

Section: Oxford and Quantum Entanglementmentioning

confidence: 99%

“…Hanna (1948) in Cambridge and Bleuler & Bradt (1948) in Purdue then published the results of their experiments. Taking account of the specific geometry used, the result of the Purdue experiment for the asymmetry ratio was enormal⊥/e∥=1.94±0.37, compared with the theoretical value of enormal⊥/e∥=1.7. This was very satisfactory, although Hanna's result did not agree so well with the theory.…”

Section: Oxford and Quantum Entanglementmentioning

confidence: 99%

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John Clive Ward. 1 August 1924—6 May 2000

Dombey

2021

Biogr. Mems Fell. R. Soc.

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John Clive Ward was a theoretical physicist who made important contributions to two of the principal subjects in twentieth-century elementary particle physics: namely, quantum electrodynamics (QED) and electroweak theory. He was an early proponent of the importance of gauge theories in quantum field theory and their use in demonstrating the renormalization of those theories: that is, to remove apparent infinities in calculations. He showed that gauge invariance implies the equality of two seemingly different renormalized quantities in QED, a relationship now called the Ward Identity. This identity can be generalized to more general gauge theories in particle physics and remains a fundamental tool in these theories, which dominate particle theory at the present time. He collaborated with Abdus Salam on the use of gauge theories in strong interactions and in electroweak theory. He also made significant contributions to statistical physics. In 1955 he was recruited by the UK Atomic Weapons Research Establishment at Aldermaston to head the Green Granite section of the theoretical group, which had the task of rederiving the thermonuclear weapon concepts developed by Ulam and Teller in the United States. He spent the years from 1966 to his retirement in 1984 at Macquarie University in Australia.

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Section: Quantum Electrodynamics and The Ward Identitymentioning

confidence: 97%

Section: Oxford and Quantum Entanglementmentioning

confidence: 99%

Section: Oxford and Quantum Entanglementmentioning

confidence: 99%

“…Ward's full calculation (3) (equation [2]) showed that the differential cross section for the process in terms of the scattering angles θ 1 and θ 2 of photons 1 and 2 and azimuthal angles φ 1 and φ 2 of their polarizations is proportional to falsefalse{(1−cosθ1)3+2falsefalse}falsefalse{(1−cosθ2)3+2falsefalse}(2−cosθ1)3(2−cosθ2)3−sin2θ1sin2θ2(2−cosθ1)2(2−cosθ2)2cos⁡2false(φ1−φ2false). …”

Section: Oxford and Quantum Entanglementmentioning

confidence: 99%