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  • Bose-Einstein condensation in an electro-pneumatically transformed quadrupole-Ioffe magnetic trap 
    Kumar, Sunil; Sarkar, Sumit; VERMA, GUNJAN; VISHWAKARMA, CHETAN; Noaman, Md; RAPOL, UMAKANT D. (IOP Publishing, 2015-02)
    We report a novel approach for preparing a Bose–Einstein condensate (BEC) of 87Rb atoms using an electro-pneumatically driven transfer of atoms into a quadrupole-Ioffe magnetic trap (QUIC trap). More than 5 × ${{10}^{8}}$ ...
  • A compact atomic beam based system for Doppler-free laser spectroscopy of strontium atoms 
    VERMA, GUNJAN; VISHWAKARMA, CHETAN; DHARMADHIKARI, CHANDRAKANT V.; RAPOL, UMAKANT D. (AIP Publishing, 2017-02)
    We report the construction of a simple, light weight, and compact atomic beam spectroscopy cell for strontium atoms. The cell is built using glass blowing technique and includes a simple titanium sublimation pump for the ...
  • Nonexponential Decoherence and Subdiffusion in Atom-Optics Kicked Rotor 
    Sarkar, Sumit; Paul, Sanku; VISHWAKARMA, CHETAN; Kumar, Sunil; VERMA, GUNJAN; Sainath, M.; RAPOL, UMAKANT D.; SANTHANAM, M. S. (American Physical Society, 2017-04)
    Quantum systems lose coherence upon interaction with the environment and tend towards classical states. Quantum coherence is known to exponentially decay in time so that macroscopic quantum superpositions are generally ...
  • Diffraction of an atom laser in the Raman-Nath regime 
    Sarkar, Sumit; MANGAONKAR, JAY; VISHWAKARMA, CHETAN; RAPOL, UMAKANT D. (American Physical Society, 2018-10)
    An atom interferometer is a ubiquitous tool for measuringfundamental constants and inertial sensing. While it has been extremely useful in measuring inertial rotations, the fine-structure constant, gravity gradients, and ...
  • A simple atomic beam oven with a metal thermal break 
    VISHWAKARMA, CHETAN; MANGAONKAR, JAY; PATEL, KUSHAL; VERMA, GUNJAN; SARKAR, SUMIT; RAPOL, UMAKANT D. (AIP Publishing, 2019-05)
    We report the design and construction of a simple, easy to machine high temperature oven for generating an atomic beam in laser cooling experiments. This design eliminates the problem of thermal isolation of the oven region ...
  • Nonmonotonic diffusion rates in an atom-optics Levy kicked rotor 
    Paul, Sanku; SARKAR, SUMIT; VISHWAKARMA, CHETAN; MANGAONKAR, JAY; SANTHANAM, M. S.; RAPOL, UMAKANT D. (American Physical Society, 2019-12)
    The dynamics of chaotic Hamiltonian systems such as the kicked rotor continues to guide our understanding of transport and localization processes. The localized states of the quantum kicked rotor decay due to decoherence ...
  • Effects of finite momentum width on the reversal dynamics in a BEC based atom optics delta-kicked rotor 
    MANGAONKAR, JAY; VISHWAKARMA, CHETAN; MAURYA, S. SAGAR; SARKAR, SUMIT; MacLennan, Jamie L.; DUTTA, PRANAB; RAPOL, UMAKANT D. (IOP Publishing, 2020-12)
    This experimental work demonstrates the importance of finite-width effects in the evolution of a quantum system, where the results deviate considerably from the plane wave approximation even for an initial state with a ...

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