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E.C.G. Sudarshan: The Vedantin Physicist

Dinithi Garusinghe

Published Jan 1, 2018• 0 citations
OpenAlex

Abstract

ECG Sudarshan passed away on Monday, May 16, 2018 at the age of 86 in Texas, USA. He was the most brilliant theoretical physicist of Indian origin of the century. His research spanned a wide range of topics like Particle Physics, Quantum Optics, Quantum Field Theory, Quantum Information Theory, Gauge Theories and Classical Mechanics and in each of them he could make unique contributions. He has been credited with numerous important inventions in the field of Theoretical Physics including Optical Coherence, Sudarshan-Glauber Representation, V-A Theory, Tachyons, Quantum Zeno Effect, Open Quantum System, Spin-statistics Theorem, Non-invariance Groups, Positive Maps of Density Matrices, Quantum Computation etc. His contributions include also on subjects like Orientalia, cultural studies, philosophy and religion. This is a brief account of his life and works in remembrance.

Related papers

The Legacy of George Sudarshan

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George Sudarshan was an eclectic thinker, and one of the most profound physicists of the last century. We review here a small part of his oeuvre, focusing on his pioneering contributions to the quantum Zeno effect, quantum channels (the Kraus–Sudarshan representation) and quantum semigroups (the Gorini–Kossakowski–Lindblad–Sudarshan equation). These topics are of crucial importance in the booming field of quantum mechanics and applications.

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A homage to E.C.G.Sudarshan: Superluminal objects and waves (An updated overview of the relevant experiments)

Erasmo Recami

This writing has been prepared on the occasion of the 75th birthday of E.C.George Sudarshan, who (besides the originator of the V-A theory for weak-forces, of quantum optics --the quantum representation of coherent light--, of dynamical maps for open quantum systems, of the Zeno effect, etc.) was a pioneer, already in the sisties, also of the theory of the so-called "tachyons". This paper wishes to be a homage to E.C.G.Sudarshan, in connection with the last-mentioned pioneering work of his. After a brief theoretical introduction (based on the standard postulates of Special Relativity, and therefore extending it --or rather non-restricting it-- without any violations: for example, without any violations of the so-called Einstein causality), the main aim of this article is an updated presentation of the status-of-the-art of the "superluminal" experiments. In particular, we devote such a review to the phenomena met in tunneling through quantum (and classical) barriers [e.g., referring to the Genelalized Hartman Effect]; and in connection with the "Localized (nondiffracting) Solutions" of the wave equantions [e.g., of Maxwell equations]: especially of the "X-shaped" ones. The interested reader is provided with an extended Bibliography.

arXiv:0804.1502•Apr 9, 2008•3 citations

Sudarshan Memorial Lecture

Parthasarathy, R

In this invited talk, I discuss four important contributions of E.C.G. Sudarshan, among many. They are the V-A theory of weak interaction, Sudarshan - Glauber representation, tachyons and the quantum zeno effect.

arXiv:1907.11423•Jul 26, 2019•0 citations

A sincere tribute to E.C.G Sudarshan's phenomenal contribution toward quantum theory of optical coherence

Arindam Kumar Chatterjee, Anik Rudra, Soham Chakraborty

The diagonal representation and optical equivalence theorem are the E. C. G. Sudarshan's mid 20th century adventures in non-classical optics. It basically deals with a quantum mechanical description of photons to explain the quantum properties of light. Inspired by Sudarshan's pioneering work we try to explain the every minute mathematical details of his paper "Equivalence of semi-classical and quantum mechanical descriptions of statistical light beams". In this article we are going to go through some of the basics in developing quantum optics, then land up in E.C.G's original work and try to present it as rigorous as possible. We show some of its important applications in various classes of physics problems.

arXiv:1812.03854•Nov 21, 2018•0 citations

Superluminal waves and objects: An up-dated overview of the relevant experiments

Erasmo Recami

After a brief theoretical introduction (based on the standard postulates of Special Relativity, and therefore extending it --or rather non-restricting it-- without any violations: in particular without any violations of the so-called Einstein causality), the main aim of this article is an updated presentation of the status-of-the-art of the superluminal experiments. In particular, we devote such an article to the phenomena met in tunneling through quantum (and classical) barriers [e.g., referring to the Genelalized Hartman Effect]; and in connection with the Localized (nondiffracting) Solutions of the wave equations [e.g., of Maxwell equations]: especially of the X-shaped ones. The interested reader is provided with an extended Bibliography. This paper was written as a homage to E.C.G. Sudarshan, in connection with his pioneering work on the so-called tachyons. Actually, E.C.George Sudarshan, besides the originator of the V-A theory for weak-forces, of quantum optics --the quantum representation of coherent light--, of dynamical maps for open quantum systems, of the Zeno effect, etc., was a pioneer, in the sisties, also of the theory of Tachyons.

•Jan 1, 2010•3 citations

About Roy Glauber

Břetislav Friedrich, Daniel Kleppner, Dudley R. Herschbach

Abstract We recount the life, work, and legacy of the theoretical physicist Roy Glauber (1925–2018). Admitted to Harvard at age 16, called upon to participate in the Manhattan Project at age eighteen, and appointed to the Harvard Physics faculty at age 29, Glauber is credited with seminal contributions to three separate fields of physics: nuclear scattering, statistical physics, and foundational work in quantum optics, which earned him the 2005 Nobel Prize in Physics. Over decades, Glauber was also a dedicated teacher of high‐school, college, and graduate students. His pedagogical gifts are reflected in his lucid papers that read as if they were written yesterday. Key points perspective on the life, work, and legacy of the 2005 Physics Nobel laureate Roy Glauber (1925–2018) impact of Glauber's contributions on large swaths of physics, from nuclear to optical to condensed matter Glauber's work in quantum optics has nurtured burgeoning areas of quantum science and engineering

Natural Sciences•Apr 10, 2023•1 citation
ECG Sudarshan passed away on Monday, May 16, 2018 at the age of 86 in Texas, USA. He was the most brilliant theoretical physicist of Indian origin of the century. His research spanned a wide range of topics like Particle Physics, Quantum Optics, Quantum Field Theory, Quantum Information Theory, Gauge Theories and Classical Mechanics and in each of them he could make unique contributions. He has been credited with numerous important inventions in the field of Theoretical Physics including Optical Coherence, Sudarshan-Glauber Representation, V-A Theory, Tachyons, Quantum Zeno Effect, Open Quantum System, Spin-statistics Theorem, Non-invariance Groups, Positive Maps of Density Matrices, Quantum Computation etc. His contributions include also on subjects like Orientalia, cultural studies, philosophy and religion. This is a brief account of his life and works in remembrance.
This writing has been prepared on the occasion of the 75th birthday of E.C.George Sudarshan, who (besides the originator of the V-A theory for weak-forces, of quantum optics --the quantum representation of coherent light--, of dynamical maps for open quantum systems, of the Zeno effect, etc.) was a pioneer, already in the sisties, also of the theory of the so-called "tachyons". This paper wishes to be a homage to E.C.G.Sudarshan, in connection with the last-mentioned pioneering work of his. After a brief theoretical introduction (based on the standard postulates of Special Relativity, and therefore extending it --or rather non-restricting it-- without any violations: for example, without any violations of the so-called Einstein causality), the main aim of this article is an updated presentation of the status-of-the-art of the "superluminal" experiments. In particular, we devote such a review to the phenomena met in tunneling through quantum (and classical) barriers [e.g., referring to the Genelalized Hartman Effect]; and in connection with the "Localized (nondiffracting) Solutions" of the wave equantions [e.g., of Maxwell equations]: especially of the "X-shaped" ones. The interested reader is provided with an extended Bibliography.
The diagonal representation and optical equivalence theorem are the E. C. G. Sudarshan's mid 20th century adventures in non-classical optics. It basically deals with a quantum mechanical description of photons to explain the quantum properties of light. Inspired by Sudarshan's pioneering work we try to explain the every minute mathematical details of his paper "Equivalence of semi-classical and quantum mechanical descriptions of statistical light beams". In this article we are going to go through some of the basics in developing quantum optics, then land up in E.C.G's original work and try to present it as rigorous as possible. We show some of its important applications in various classes of physics problems.
After a brief theoretical introduction (based on the standard postulates of Special Relativity, and therefore extending it --or rather non-restricting it-- without any violations: in particular without any violations of the so-called Einstein causality), the main aim of this article is an updated presentation of the status-of-the-art of the superluminal experiments. In particular, we devote such an article to the phenomena met in tunneling through quantum (and classical) barriers [e.g., referring to the Genelalized Hartman Effect]; and in connection with the Localized (nondiffracting) Solutions of the wave equations [e.g., of Maxwell equations]: especially of the X-shaped ones. The interested reader is provided with an extended Bibliography. This paper was written as a homage to E.C.G. Sudarshan, in connection with his pioneering work on the so-called tachyons. Actually, E.C.George Sudarshan, besides the originator of the V-A theory for weak-forces, of quantum optics --the quantum representation of coherent light--, of dynamical maps for open quantum systems, of the Zeno effect, etc., was a pioneer, in the sisties, also of the theory of Tachyons.
Abstract We recount the life, work, and legacy of the theoretical physicist Roy Glauber (1925–2018). Admitted to Harvard at age 16, called upon to participate in the Manhattan Project at age eighteen, and appointed to the Harvard Physics faculty at age 29, Glauber is credited with seminal contributions to three separate fields of physics: nuclear scattering, statistical physics, and foundational work in quantum optics, which earned him the 2005 Nobel Prize in Physics. Over decades, Glauber was also a dedicated teacher of high‐school, college, and graduate students. His pedagogical gifts are reflected in his lucid papers that read as if they were written yesterday. Key points perspective on the life, work, and legacy of the 2005 Physics Nobel laureate Roy Glauber (1925–2018) impact of Glauber's contributions on large swaths of physics, from nuclear to optical to condensed matter Glauber's work in quantum optics has nurtured burgeoning areas of quantum science and engineering