Sudhir Ranjan Jain (born 16 May 1963) is an Indian theoretical physicist[1][2][3] at the Bhabha Atomic Research Centre, Mumbai, known for his contributions in complex quantum systems and Nonlinear dynamics. He was a scientist at the nuclear physics division of Bhabha Atomic Research Centre, a professor at Homi Bhabha National Institute and is an adjunct professor and member of the Academic Board at the Centre for Excellence in Basic Sciences. He has authored Mechanics, Waves and Thermodynamics: An Example-based Approach and A Primer on Fluid Mechanics with Applications.[4][5] His doctoral advisor was Prof. Suresh V. Lawande,[6] who was a student of Edward Teller.[7]
He is known for his work on many-body systems, especially for Jain-Khare models[16][17][18] which gave exact quantum solutions with connections to random matrix theory, leading to exact eigenfunctions for a class of chaotic systems. The bosonised version of the Jain-Khare model exhibits Bose Einstein condensation.[16]
His notable works include his work on Pseudo Hermitian Random Matrix theory,[19] relation of Random Matrix theory to anyon gases,[20] theorems and statistics for integrable billiards and nodal domains,[21][22][23] quantum modes built on chaotic motion,[24]Poincaré recurrence theorem in Kac's ring.[25] His work in neutrino physics pioneered in calculation of geometric phases in neutrinos.[26][27]
Among other contributions, Jain made significant developments towards the exact semiclassical treatment of deuteron[28] which he further extended to nuclear three body problem of triton.[29] He developed an exact semiclassical trace formula to calculate level densities of spherical nuclei with no adjustable parameters.[30]
He has also worked on quantum computation and quantum information science. In particular, his work with his collaborators has led to an understanding of controlling quantum jump by realising "Dehmelt-like" shelving by employing quantum Zeno effect.[31] His work has contributed a non-topological code with highest encoding rate [32] and established protection of qubits using ideas from classical and quantum nonlinear science [33][34][35]
He was scientific secretary of the XXth Solvay Conference on Femtochemistry.[36] He was also the convenor of International conference on complex quantum systems in 2017,[37] 2020 and 2023.[38]
↑ Pseudo-Hermitian random matrix theory, S. C. L. Srivastava, Sudhir R. Jain, Fortchritte der Physik 61, 276 (2013)
↑ From random matrix theory to statistical mechanics - anyon gas, D. Alonso and Sudhir R. Jain, Phys. Lett. B387, 812 (1996)
↑ A nodal domain theorem for integrable billiards in two dimensions, Rhine Samajdar and Sudhir R. Jain, Ann. Phys. 351, 1 (2014)
↑ Nodal portraits of quantum billiards: Domains, lines, and statistics, Sudhir R. Jain and Rhine Samajdar, Rev. Mod. Phys. 89, 045005 (2017).
↑ Grémaud, Benoît, and Sudhir R. Jain. Spacing distributions for rhombus billiards. Journal of Physics A: Mathematical and General 31.37 (1998): L637.
↑ Quantum modes built on chaotic motion - analytically exact results, Sudhir R. Jain, B. Gremaud, A. Khare, Phys. Rev. E 66, 016216 (2002).
↑ Kac's ring: entropy and Poincare recurrence, C. Aravind and Sudhir R. Jain, Physica A 391, 3702 (2012).
↑ Geometric phase for neutrino propagation in magnetic field, Sandeep Joshi and Sudhir R. Jain, Phys. Lett. B 754, 135 (2016)
↑ Noncyclic geometric phases and helicity transitions for neutrino oscillations in magnetic field,Sandeep Joshi and Sudhir R. Jain, Phys. Rev. D 96, 096004 (2017).
↑ Semiclassical deuteron, Sudhir R. Jain, J. Phys. G 30, 157 (2004).
↑ Semiclassical triton, Nishchal R. Dwivedi, Harjeet Kaur, and Sudhir R. Jain, Eur. Phys. J. A 54, 49 (2018)
↑ Semiclassical theory of melting of shell effects in nuclei with temperature, Harjeet Kaur and Sudhir R. Jain, J. Phys. G 42, 115103 (2015)
↑ Komal Kumari, Garima Rajpoot, Sandeep Joshi, S. R. Jain, Ann. Phys. 450, 169222 (2023))
↑ Green-Kubo formula for electrical conductivity of a driven 0-π qubit, Garima Rajpoot, Komal Kumari, Sandeep Joshi, and Sudhir R. Jain, Theor. & Math. Phys. 213, 1727 (2022)
↑ Page xi, Chemical Reactions and their Control on the Femtosecond Time Scale: XXth Solvay Conference on Chemistry. Vol. 220. John Wiley & Sons
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