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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 ...
  • Selective tuning of Hilbert spaces in states encoded with spatial modes of light 
    Anwar, Ali; Lal, Nijil; Prabhakar, Shashi; Singh, R. P. (IOP Publishing, 2020-11)
    Spatial modes of light directly give the most easily accessible degree of freedom that span an infinite dimensional Hilbert space. The higher dimensional spatial mode entanglement realized using spontaneous parametric down ...

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