P
Philip R. Johnson
Researcher at American University
Publications - 74
Citations - 2258
Philip R. Johnson is an academic researcher from American University. The author has contributed to research in topics: Quantum field theory & Josephson effect. The author has an hindex of 21, co-authored 71 publications receiving 2122 citations. Previous affiliations of Philip R. Johnson include University of Washington & University of Cambridge.
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Journal ArticleDOI
Entangled macroscopic quantum States in two superconducting qubits.
Andrew J. Berkley,Huizhong Xu,Roberto Ramos,M. A. Gubrud,Frederick W. Strauch,Philip R. Johnson,J. R. Anderson,Alex J. Dragt,Christopher Lobb,Frederick C. Wellstood +9 more
TL;DR: Microwave spectroscopy in the 4 to 6 gigahertzrange at 20 millikelvin reveals energy levels that agree well with theoretical results for entangled states.
Journal ArticleDOI
Quantum logic gates for coupled superconducting phase qubits.
Frederick W. Strauch,Philip R. Johnson,Alex J. Dragt,Christopher Lobb,J. R. Anderson,Frederick C. Wellstood +5 more
TL;DR: Based on a quantum analysis of two capacitively coupled current-biased Josephson junctions, two fundamental two-qubit quantum logic gates are proposed, each of these gates, when supplemented by single-qu bit operations, is sufficient for universal quantum computation.
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Effects of Narratives, Openness to Dialogic Communication, and Credibility on Engagement in Crisis Communication Through Organizational Blogs
TL;DR: Data suggest that the openness to dialogic communication is essential to creating and enhancing audience engagement in crisis communication, which, in turn, leads to positive postcrisis perceptions.
Uses and Gratifications of Twitter: An Examination of User Motives and Satisfaction of Twitter Use
Philip R. Johnson,Sung-Un Yang +1 more
Journal ArticleDOI
Stochastic theory of relativistic particles moving in a quantum field: Scalar Abraham-Lorentz-Dirac-Langevin equation, radiation reaction, and vacuum fluctuations
Philip R. Johnson,Bei-Lok Hu +1 more
TL;DR: In this article, the authors apply the particlecentric world-line quantization formulation to the quantum field theory of scalar QED and derive a time-dependent (scalar) Abraham-Lorentz-Dirac (ALD) equation and show that it is the correct semiclassical limit for nonlinear particle-field systems without the need of making the dipole or nonrelativistic approximations.