1,727,921 research outputs found
The Glauber-Sudarshan and Kirkwood-Rihaczec functions
Get PDFIt is shown how to write the Kirkwood-Rihaczec quasiprobability distribution as an expectation value of the vacuum state. We do this, by writing the position eigenstates as a ”displacment” of the vacumm. We also give a relation between the Glauber-Sudarshan and Kirkwood-Rihaczec quasiprobability distributions
The Legacy of George Sudarshan
No full textGeorge 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
Representation of Minorities in Research: A View from the Community
Get PDFAUTHOR AFFILIATION: Sudarshan Pyakurel, Arogya Institute and Bhutanese Nepali Community of Central Ohio, United States, [email protected] media can be accessed here:
http://streaming.osu.edu/knowledgebank/PREA/PREA_Session13C_Pyakurel_20190326.mp
Off-resonant quantum Zeno and anti-Zeno effects on entanglement
Get PDFWe examine the appearance of Zeno and anti-Zeno effects (Misra and Sudarshan 1977 J. Math. Phys. 18 756; Kofman and Kurizki 2000 Nature 405 546; Kofman and Kurizki 1996 Phys. Rev. A 54 3750; Facchi et al 2001 Phys. Rev. Lett. 86 2699) in the entanglement dynamics of two qubits off-resonantly coupled to the same lossy cavity when the unitary evolution of the system is interrupted by repeated projective measurements. We describe in detail these quantum effects by comparing the measurement-induced coarse-grained dynamics to the entanglement evolution in the absence of measurements in several scenarios (Francica et al 2009 Phys. Rev. A 79 032310). In particular, we examine the strong and weak coupling regimes, the role of the relative coupling strengths between the two qubits and the reservoir and the effect of the detuning from the main cavity frequency. We show that the anti-Zeno effect can occur in the entanglement dynamics when the qubit frequencies are detuned from the main reservoir frequency. Furthermore, we find that Zeno and anti-Zeno effects can even appear sequentially many times as a function of the interval between the measurements. Finally, we show that, in the off-resonant regime, we can preserve the entanglement using the quantum Zeno effect more efficiently than in the resonant limit (Maniscalco et al 2008 Phys. Rev. Lett. 100 090503), even if, in this case, no sub-radiant state exists
Remembering George Sudarshan
No full textIn these brief notes we want to render homage to the memory of E.C.G. Sudarshan, adding it to the many contributions devoted to preserve his memory from a personal point of view
Pharmacological Potential of Polyherbal Formulation, Sudarshan Churna – A Review
Get PDFThe Sudarshan Churna is a valuable Ayurvedic preparation, which was usedtraditionally as antimalarial, antipyretic, antiviral and antidiabetic agent. It has been givenfrom ancient time by Vaidyas to cure all types of fever including bone fever, fever due tocommon cold, viral fever etc. In Sudarshan Churna, Swertia Chirata is present in 50% oftotal quantity, remaining other ingredients is in equal proportion in remaining 50% of totalchurna. The pharmacological activities are proven on Sudarshan Churna by differentresearcher are antipyretic activity, antimicrobial activity. This review helps the researcher toexplode this formulation for more pharmacological activity and its safely use
Influence of Selective Post-Deposition Laser Treatment on Tribological and Wear Properties of Cold Sprayed Titanium Coatings
No full textThe focus of this study is to assess the influence of a selective post-deposition laser treatment on the tribological and wear behavior of a titanium coating layer on aluminum. Titanium grade 2 powders were deposited onto an aluminum alloy AA2024-T3 sheet, by means of cold gas dynamic spray process. A selective laser post-treating was carried out by using a 220 W diode laser to enhanced wear properties of coatings. Tribo-tests were executed to analyze the tribological behavior of materials in contact with an alternative moving counterpart under a controlled normal load. Tribo-tests were performed on untreated aluminum sheets, titanium grade 2 sheet, as-sprayed titanium powders and laser-treated coating layer to compare the wear properties of different materials and the effectiveness of treatment. The results obtained proved the effectiveness of the laser treatment in improving the wear performances of the coating, in terms of both friction coefficient and mass lost. The laser treatment promotes a change of the wear mechanism, switching from a severe adhesive wear, resulting in the Galling phenomenon, to an abrasive wear
Sudarshan Seneviratne: Bibliography
No full textSudarshan Seneviratne (1949-2024), a pioneer scholar in Sri Lankan history, archaeology, and heritage research, has made significant contributions through his prolific publication record and seminars in both Sri Lankan and international settings. His focus on a broad spectrum of problem-oriented and issue-related multidisciplinary topics within the fields of history, archaeology, and heritage studies have been disseminated in English, and also translated into Sinhala and Tamil. This document compiles the extensively referenced work of Seneviratne into a comprehensive bibliography
George Sudarshan: Perspectives and Legacy
Get PDFGeorge Sudarshan has been hailed as a titan in physics and as one who has made some of the most significant contributions in several areas of physics. This article is an attempt to highlight the seminal contributions he has made in physics and the significant developments that arose from his work.Quanta 2021; 10: 75–104
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