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  • Effect of parameter mismatch on the dynamics of strongly coupled self sustained oscillators 
    Lal, Nijil; Parmananda, Punit; Das Gupta, Kantimay; Chakrabarty, Nilaj; Jain, Aditya (AIP Publishing, 2017-01)
    In this paper, we present an experimental setup and an associated mathematical model to study the synchronization of two self-sustained, strongly coupled, mechanical oscillators (metronomes). The effects of a small detuning ...
  • Investigation of propagation dynamics of truncated vector vortex beams 
    Srinivas, P.; Perumangatt, Chithrabhanu; Lal, Nijil; Singh, R. P.; Srinivasan, B. (Optical Society of America, 2018-06)
    In this Letter, we experimentally investigate the propagation dynamics of truncated vector vortex beams generated using a Sagnac interferometer. Upon focusing, the truncated vector vortex beam is found to regain its original ...
  • Observing sub-poissonian statistics of twisted single photons using oscilloscope 
    Lal, Nijil; Shajilal, Biveen; Anwar, Ali; Perumangatt, Chithrabhanu; Singh, R. P. (AIP Publishing, 2019-11)
    Heralded single photon sources (HSPSs) from spontaneous parametric down-conversion are widely used as single photon sources. We study the photon number statistics of an HSPS carrying orbital angular momentum in our laboratory ...
  • Pancharatnam phase in non-separable states of light 
    Lal, Nijil; Chithrabhanu, P.; Gangi Reddy, Salla; Anwar, Ali; Aadhi, A.; Singh, R. P. (Optical Society of America, 2016)
    We generate the non-separable state of polarization and orbital angular momentum using a laser beam. The generated state undergoes a cyclic polarization evolution which introduces a Pancharatnam geometric phase to the ...
  • Photon statistics of twisted heralded single photons 
    Lal, Nijil; Banerji, Anindya; Biswas, Ayan; Anwar, Ali; Singh, R. P. (Taylor & Francis, 2019-12)
    We study the correlation properties of single photons carrying orbital angular momentum (OAM) in a Hanbury Brown and Twiss (HBT) type experiment. We have characterized single photon sources obtained by pumping a nonlinear ...
  • Quantum information with even and odd states of orbital angular momentum of light 
    Perumangatt, Chithrabhanu; Lal, Nijil; Anwar, Ali; Reddy, Salla Gangi; Singh, R. P. (Elsevier, 2017-06)
    We address the possibility of using even/odd states of orbital angular momentum (OAM) of photons for the quantum information tasks. Single photon qubit states and two photon entangled states in even/odd basis of OAM are ...
  • Selecting the pre-detection characteristics for fiber coupling of parametric down-converted biphoton modes 
    Lal, Nijil; Anwar, Ali; Chithrabhanu, P.; Reddy, Salla Gangi (Elsevier, 2017-01)
    Photon modes have an important role in characterizing the quantum sources of light. The two main pre-detection factors affecting the biphoton mode coupling in SPDC are the pump beam focusing parameter and the crystal ...

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