Refine your search
Collections
Co-Authors
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Dattagupta, Sushanta
- Coherence Versus Decoherence - A few Illustrative Examples
Abstract Views :262 |
PDF Views:84
Authors
Affiliations
1 Visva-Bharati, Santiniketan 731 235, India and Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560 064, IN
1 Visva-Bharati, Santiniketan 731 235, India and Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru 560 064, IN
Source
Current Science, Vol 109, No 11 (2015), Pagination: 1951-1957Abstract
The interplay of coherence and decoherence is a vexing issue in contemporary condensed matter physics, quantum optics and quantum information theory. We present an overview of this important topical subject, in terms of three different paradigms, in which the 'noisy' effect of the environment on small quantum subsystems is analysed.Keywords
Coherence, Decoherence, Dissipative Diamagnetism, Qubit.Full Text
References
- Imry, Y., Introduction to Mesoscopic Physics, Oxford University Press, 1997.
- Merzbacher, E., Quantum Mechanics, John Wiley, 1961.
- Messiah, A., Quantum Mechanics, North-Holland, 1969, vol. II.
- For a comprehensive review on the spin boson model, see: Leggett, A. J., Chakravarty, S., Dorsey, A. T., Fisher, M. P. A., Garg, A. and Zwerger, W., Dynamics of the dissipative two-state system. Rev. Mod. Phys., 1987, 59(1), 1–85.
- Van Vleck, J. H., The Theory of Electric and Magnetic Susceptibilities, Oxford University Press, 1932.
- Landau, L., Diamagnetsimus der metalle. Z. Phys., 1930, 64(9–10), 629–637.
- Caldeira, A. O. and Leggett, A. J., Influence of dissipation on quantum tunneling in macroscopic systems. Phys. Rev. Lett., 1981, 46(4), 211–214; Caldeira, A. O. and Leggett, A. J., Path integral approach to quantum Brownian motion. Physica A, 1983, 121A(3), 587–616; Caldeira, A. O. and Leggett, A. J., Quantum tunnelling in a dissipative system. Ann. Phys., 1984, 149(2), 374– 456.
- Weiss, U., Quantum Dissipative Systems, World Scientific, 1999.
- Grabert, H., Schramm, P. and Ingold, G. -L., Quantum Brownian motion: the functional integral approach. Phys. Rep., 1988, 168(3), 115–207.
- Bandyopadhyay, M. and Dattagupta, S., Dissipative diamagnetism – a case study for equilibrium and nonequilibrium statistical mechanics. J. Stat. Phys., 2006, 123(6), 1273–1284; Kumar, J., Sreeram, P. A. and Dattagupta, S., Low-temperature thermodynamics in the context of dissipative diamagnetism. Phys. Rev. E, 2009, 79(2), 021130-1 to 021130-7.
- Ford, G. W., Kac, M. and Mazur, P., Statistical mechanics of assemblies of coupled oscillators. J. Math. Phys., 1965, 6(4), 504– 515; Ford, G. W., Lewis, J. T. and O’Connell, R. F., The quantum Langevin equation. Phys. Rev. A, 1988, 37(11), 4419–4428.
- Li, X. L., Ford, G. W. and O’Connell, R. F., Magnetic-field effects on the motion of a charged particle in a heat bath. Phys. Rev. A, 1990, 41(10), 5287–5289; Li, X. L., Ford, G. W. and O’Connell, R. F., Charged oscillator in a heat bath in the presence of a magnetic field. Phys. Rev. A, 1990, 42(8), 4519–4527.
- Bandyopadhyay, M. and Dattagupta, S., Landau–Drude diamagnetism: fluctuation, dissipation and decoherence. J. Phys.: Condens. Matter, 2006, 18(44), 10029–10041.
- Dattagupta, S., Jayannavar, A. M. and Kumar, N., Landau diamagnetism revisited. Curr. Sci., 2001, 80(7), 861–863.
- Dattagupta, S. and Singh, J., Landau diamagnetism in a dissipative and confined system. Phys. Rev. Lett., 1997, 79(6), 961–965; see also: Dattagupta, S. and Puri, S., Dissipative Phenomena in Condensed Matter, Springer, 2004.
- Nielsen, M. A. and Chuang, I. L., Quantum Computation and Quantum Information, Cambridge University Press, 2000.
- Dattagupta, S., Diffusion: Formalism and Applications, Taylor & Francis, 2014.
- Aharony, A., Gurvitz, S., Entin-Wohlman, O. and Dattagupta, S., Retrieving qubit information despite decoherence. Phys. Rev. B, 2010, 82(24), 245417-1 to 245417-10.
- Gangopadhyay, G., Kumar, M. S. and Dattagupta, S., On dissipationless decoherence. J. Phys. A: Math. Gen., 2001, 34(27), 5485– 5495.
- Grinstein, G. and Mazenko, G. (eds), Directions in Condensed Matter Physics, World Scientific, 1986.
- Datta, S., Electronic Transport in Mesoscopic Systems, Cambridge University Press, 1977.
- Bennett, C. H., Quantum information and computation. Phys. Today, 1995, 48(10), 24–30.
- Zeilinger, A., The quantum centennial. Nature, 2000, 408(6813), 639–641; Zeilinger, A., Quantum entangled bits step closer to IT. Science, 2000, 289(5478), 405–406.
- Feynman, R. P. and Vernon Jr, F. L., The theory of a general quantum system interacting with a linear dissipative system. Ann. Phys., 1963, 24, 118–173; Feynman, R. P., Statistical Mechanics, Addison-Wesley, 1972.
- Engine
Abstract Views :456 |
PDF Views:78
Authors
Affiliations
1 Bose Institute, Kankurgachi, Kolkata 700 054, IN
1 Bose Institute, Kankurgachi, Kolkata 700 054, IN
Source
Current Science, Vol 114, No 06 (2018), Pagination: 1149-1150Abstract
The word ‘engine’ implies locomotion. Indeed trains powered by engines occupy a special place in our lives. They evoke romanticism of poetry, novels and Bollywood films, including some memorable songs that have been tuned with the whistling sound of engines. Time magazine once carried a cover story on Indian trains laden with delightful anecdotes. It narrates how job discussions, interview preparations, marriage negotiations, political wheeling and dealings, business transactions, etc. are all carried out inside railway compartments. The noted mathematician, historian and philologist D. D. Kosambi receiving mail from the Postal Department, on his regular sojourn in the ‘Deccan Queen’ between Poona and Bombay, is now a legend.Full Text
- Ageing of Academic Institutions
Abstract Views :254 |
PDF Views:81
Authors
Affiliations
1 Uniworld City, ‘Heights’ 6, No. 002, New Town, Kolkata 700 160, IN
1 Uniworld City, ‘Heights’ 6, No. 002, New Town, Kolkata 700 160, IN
Source
Current Science, Vol 117, No 3 (2019), Pagination: 347-348Abstract
Ageing is a natural phenomenon, for example, of the human body wherein it is accelerated due to malnutrition, unclean ‘environment’, etc. In Radioactivity, ‘ageing’ is quantified by ‘half-life’ – the time by which an element ‘decays’ to half its initial ‘value’. (The quotes here underscore that these adages are to be understood as metaphors.) Here I focus on the ageing of academic institutions of India – universities, institutes of science education and technology, and a slew of research organizations, aided and administered by the central government – of which I have first-hand knowledge.Full Text
- On Interdisciplinarity
Abstract Views :258 |
PDF Views:78
Authors
Affiliations
1 INSA Senior Scientist, Bose Institute, Kolkata 700 054, IN
1 INSA Senior Scientist, Bose Institute, Kolkata 700 054, IN
Source
Current Science, Vol 118, No 9 (2020), Pagination: 1331-1332Abstract
‘Interdisciplinary’ is a buzzword today. What is its significance, which areas are interdisciplinary, and how the practice in India is, are issues that need analysis and introspection (Balaram, P., Curr. Sci., 2012, 102, 1345– 1346). I offer my limited views as an illustrative summary of the underlying challenges. I feel the two areas of sciences on which interdisciplinarity rests are chemistry and physics. Mathematics is not included here, being outside the realm of experimentation, though it is an essential tool for interdisciplinary research.Full Text
- Higher Education Scenario – Some Observations
Abstract Views :241 |
PDF Views:80
Authors
Affiliations
1 Bose Institute, Kolkata 700 054, IN
1 Bose Institute, Kolkata 700 054, IN
Source
Current Science, Vol 119, No 10 (2020), Pagination: 1610-1610Abstract
No Abstract.Full Text
- Can Graphene be used to Teach Quantum Mechanics?
Abstract Views :249 |
PDF Views:73
Authors
Affiliations
1 Bose Institute, Kolkata 700 054, IN
1 Bose Institute, Kolkata 700 054, IN
Source
Current Science, Vol 119, No 4 (2020), Pagination: 593-597Abstract
Graphene is a wonder material of the future with remarkable attributes of immense technological significance. It is an allotrope of carbon (C) in the structure of a single layer of C atoms, each on the vertex of a hexagonal (honeycomb) lattice. Graphene displays extraordinary properties: (i) mechanical strength – it is one hundred times stronger than the strongest steel; (ii) unusual transport – it is a highly efficient conductor of both heat and electricity; (iii) magnetism – it has a large and nonlinear diamagnetism facilitating levitation; (iv) catalysis – a single layer of graphene is hundred times more chemically reactive than thicker sheets; (v) bio-materials – it is an extremely sensitive bio-sensor, just to name a few. It is not surprising then that graphene has captured the imagination and inquisition of today’s internet-savvy high-school and undergraduate students. Yet, it is fascinating to note that all the material characteristics of graphene are the outcome of basic quantum mechanical principles – non-relativistic as well as relativistic. Quantum mechanics is generally considered to be an abstruse topic being far removed from the day-to-day reality of the ‘classical’ world. Given the curiosity that graphene has generated amongst the youth, is it possible to channelize this excitement to arouse heightened awareness of the subject of quantum mechanics? It is this aspect of ‘science education’ that we will explore in this note and offer a curriculum of bringing the rich laboratory of graphene to the realm of blackboard teaching of quantum mechanics. We will see that we can build up the story by starting from fundamental quantum chemistry that is taught to today’s class XI students and construct, step-by-step, a pathway to modern ideas of quantum condensed matter.Full Text
- Bikash Chandra Sinha (1945–2023)
Abstract Views :46 |
PDF Views:37
Authors
Affiliations
1 ‘Shantineer’, Santiniketan, Birbhum 731 235, IN
1 ‘Shantineer’, Santiniketan, Birbhum 731 235, IN
Source
Current Science, Vol 125, No 5 (2023), Pagination: 570-572Abstract
No Abstract.Keywords
No Keywords.Full Text