Determination of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mfrac><mrow><mi>e</mi></mrow><mrow><mi>h</mi></mrow></mfrac></math></span>, Using Macroscopic Quantum Phase Coherence in Superconductors: Implications for Quantum Electrodynamics and the Fundamental Physical Constants

B. N. TAYLOR; W. H. PARKER; D. N. LANGENBERG

doi:10.1103/RevModPhys.41.375

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Determination of $\frac{e}{h}$ , Using Macroscopic Quantum Phase Coherence in Superconductors: Implications for Quantum Electrodynamics and the Fundamental Physical Constants

B. N. TAYLOR, W. H. PARKER^*, and D. N. LANGENBERG^†

B. N. TAYLOR

RCA Laboratories, Princeton, New Jersey 08540

W. H. PARKER^*

Department of Physics, University of California, Irvine, California 92650

D. N. LANGENBERG^†

Department of Physics and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104

^*Alfred P. Sloan Foundation Fellow.
^†Supported by the National Science Foundation and the Advanced Research Projects Agency.

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Rev. Mod. Phys. 41, 375 – Published 1 July, 1969Erratum Rev. Mod. Phys. 45, 109 (1973)

DOI: https://doi.org/10.1103/RevModPhys.41.375

Abstract

The implications of the new determination of $\frac{e}{h}$ using the ac Josephson effect in superconductors for both quantum electrodynamics (QED) and our knowledge of the fundamental physical constants are analyzed in detail. The implications for QED are investigated by first deriving a value of the fine structure constant $α$ from experimental input data which do not require the use of QED theory for their analysis. These include the Josephson-effect value of $\frac{e}{h}$ , the Faraday constant, the gyromagnetic ratio of the proton, the magnetic moment of the proton in units of the nuclear magneton, the ratio of the ampere as maintained by the United States National Bureau of Standards to the absolute ampere, and certain accurately known auxiliary constants. This is done by critically reevaluating all of the experimental data presently available on these quantities and applying the standard techniques of a least squares adjustment, including tests for imcompatibility. The value of $α$ so obtained is then used to evaluate the theoretical expressions for the Lamb shift and fine structure splitting in hydrogen, deuterium, and ionized helium, the hyperfine splitting in hydrogen, muonium, and positronium, and the anomalous magnetic moment of the electron and muon. These theoretical values are compared with critically reexamined experimental values, thus providing a test of QED in which a priori information from QED itself is not essential. The consequences of the new measurement of $\frac{e}{h}$ for our present knowledge of the fundamental physical constants are demonstrated by deriving new "best" values for the fundamental constants from a critically selected subset of all the available data. In addition to providing a consistent set of constants, this analysis focuses attention on areas in which there remain important questions which require clarification. The experimental and theoretical work necessary for the resolution of these questions is discussed, with emphasis on ways in which the study of quantum phase coherence effects in low temperature superfluid systems can make significant contributions.

Erratum

Erratum: Determination of $\frac{e}{h}$ , Using Macroscopic Quantum Phase Coherence in Superconductors: Implications for Quantum Electrodynamics and the Fundamental Physical Constants.

B. N. TAYLOR, W. H. PARKER, and D. N. LANGENBERG

Rev. Mod. Phys. 45, 109 (1973)

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Determination of $\frac{e}{h}$ , Using Macroscopic Quantum Phase Coherence in Superconductors: Implications for Quantum Electrodynamics and the Fundamental Physical Constants

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Erratum: Determination of $\frac{e}{h}$ , Using Macroscopic Quantum Phase Coherence in Superconductors: Implications for Quantum Electrodynamics and the Fundamental Physical Constants.

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Determination of eh, Using Macroscopic Quantum Phase Coherence in Superconductors: Implications for Quantum Electrodynamics and the Fundamental Physical Constants

Abstract

Erratum

Erratum: Determination of eh, Using Macroscopic Quantum Phase Coherence in Superconductors: Implications for Quantum Electrodynamics and the Fundamental Physical Constants.

References (376)

Determination of $\frac{e}{h}$ , Using Macroscopic Quantum Phase Coherence in Superconductors: Implications for Quantum Electrodynamics and the Fundamental Physical Constants

Erratum: Determination of $\frac{e}{h}$ , Using Macroscopic Quantum Phase Coherence in Superconductors: Implications for Quantum Electrodynamics and the Fundamental Physical Constants.