Quantum Optics & Quantum Information Group

Physical Research Laboratory, Navrangpura, Ahmedabad-380009, INDIA.


         Photo of R. P. Singh R. P. Singh
Professor


Tel: +91 (79) 2631 4753
Fax: +91 (79) 2631 4460
e-mail: rpsingh AT prl.res.in


Current Research Interests

Generation of optical vortices, monochromatic as well as polychromatic and study of their properties like propagation through various optical systems, their interaction and coherence properties are the main areas of research in our experimental group. We are also involved in polarized light scattering keeping in mind its application to imaging.


Future research interests

Selected publications

2017

Quantum information with even and odd states of orbital angular momentum of light
Chithrbhanu P, Nijil Lal, Ali Anwar, Salla Gangi Reddy, and R. P. Singh
Physics Letters A 381, 1858-1865 (2017)

Topological structures in vector speckle fields
Vijay Kumar, Bruno Piccirillo, Salla Gangi Reddy, and R. P. Singh
Optics Letters 42(3), 466-469 (2017)

Selecting the pre-detection characteristics for fiber coupling of parametric down-converted biphoton modes
Ali Anwar, Chithrabhanu P, Salla Gangi Reddy, Nijil Lal and R. P. Singh
Optics Communications 382, 219-224 (2017)

2016

Entanglement propagation of quantum optical vortex state
Anindya Banerji, Ravindra Pratap Singh, Dhruba Banerjee and Abir Bandhopadhyay
Optics Communications 380, 492-498 (2016)

Generating a perfect quantum optical vortex
Anindya Banerji, Ravindra Pratap Singh, Dhruba Banerjee and Abir Bandhopadhyay
Physical Review A 94, 053838 (2016)

Pancharatnam phase in non-separable states of light
Chithrabhanu P, Salla Gangi Reddy, Nijil Lal, Ali Anwar, A. Aadhi and R. P. Singh
Journal of Optical Society of America B 33(10), 2093-2098 (2016)

Generating arbitrary cebits on the orbital angular momentum Poincare sphere
Chithrabhanu P, A. Aadhi, Salla Gangi Reddy, Shashi Prabhakar and R. P. Singh
International Journal of Quanutum Information 14, 1640032 (2016)

Salla Gangi Reddy, Chithrabhanu P, Pravin Vaity, A Aadhi, Shashi Prabhakar, and R. P. Singh
Journal of Optics 18, 055602 (2016)

A. Aadhi, N. Apurv Chaitanya, M. V. Jabir, Pravin Vaity, R. P. Singh, and G. K. Samanta
Scientific Reports (Nature) 6, 25245 (2016)

Salla Gangi Reddy, Shashi Prbhakar, P. Chithrabhanu, R. P. Singh, R. Simon
Applied Optics 55, 12 (2016)

A. Aadhi, Pravin Vaity, P. Chithrabhanu, Salla Gangi Reddy, Shashi Prabhakar, R. P. Singh
Applied Optics 55, 5 (2016)


2015
 
Accurate multipixel phase measurement with classical-light interferometry
Mandeep Singh, Kedar Khare, Anand Kumar Jha, Shashi Prabhakar, and R. P. Singh
Physical Review A 91, 021802(R) (2015)

Violation of Bell’s inequality for phase singular beams
Shashi Prabhakar, Salla Gangi Reddy, A Aadhi, Chithrabhanu P, G. K. Samanta, and R. P. Singh
Physical Review A 92, 023822 (2015)

Three particle hyper entanglement: Teleportation and quantum key distribution
Chithrabhanu P, Aadhi A, Salla Gangi Reddy, Shashi Prabhakar, G. K. Samanta, G. Paul, and R. P. Singh
Quantum Information Processing, 1-14 (2015)

Scattering of non-separable states of light
Chithrabhanu P, Salla Gangi Reddy, Ali Anwar, Aadhi A, Shashi Prabhakar, and R. P. Singh
Optics Communications 355, 301-305 (2015)

Divergence of the optical vortex beams
Salla Gangi Reddy, Chithrabhanu P, Ali Anwar, Shashi Prabhakar, J. Banerji, and R. P. Singh
Applied Optics 54, 6690-6693 (2015)
Salla Gangi Reddy, Chithrabhanu P, Shashi Prabhakar, Ali Anwar, and R. P. Singh
Applied Physics Letters 107, 021104 (2015)

A Aadhi, A Chaitanya N, MV Jabir, R. P. Singh, and G. K. Samanta
Optics Letters 40, 33-36 (2015)

Polarization properties of the Airy Beam
S Nomoto, A Aadhi, Shashi Prabhakar, R. P. Singh, R. Vyas, S. Singh
Optics Letters 40, 4516-4519 (2015)


2014
 
Type-I frequency-doubling characteristics of high-power, ultrafast fiber laser in thick BIBO crystal
A Chaitanya N, A Aadhi, R. P. Singh, and G. K. Samanta
Optics Letters 39, 5419-5422 (2014)

Spatial distribution of spontaneous parametric down-converted photons for higher order optical vortices
S. Prabhakar, S. G. Reddy, A Aadhi, A. Kumar, P Chithrabhanu, G. K. Samanta, and R. P. Singh
Optics Communications 326, 64-69 (2014)

A Aadhi, N Apurv Chaitanya, R. P. Singh, and G. K. Samanta
Optics Letters 39, 3410-3413 (2014)

Higher order optical vortices and formation of speckles
Salla Gangi Reddy, Shashi Prabhakar, Ashok Kumar, J. Banerji, and R. P. Singh
Optics Letters 39, 4364-4367 (2014)

Entanglement measure using Wigner function: Case of generalized vortex state formed by multiphoton subtraction
Anindya Banerji, R. P. Singh, and Abir Bandyopadhyay
Optics Letters 39, 4364-4367 (2014)

Salla Gangi Reddy, Shashi Prabhakar, A. Aadhi, A Kumar, M. Shah, R. P. Singh, and R. Simon
Journal of the Optical Society of America A 31, 610-615 (2014)


2013
 
Manifestation of coherence decay of optical vortices on scattering through photorefractive SBN crystal
Pravin Vaity, Ashok Kumar, and R. P. Singh
Journal of Optics 15, 025711 (2013)

Measuring the topological charge of an optical vortex by using a tilted convex lens
Pravin Vaity, J. Banerji, and R. P. Singh
Physics Letters A 39, 1154-1156 (2013)

Formation of optical vortices through superposition of two Gaussian beams
Pravin Vaity, A. Aadhi, and R. P. Singh
Applied Optics 52, 6652 (2013)

Experimental generation of ring-shaped beams with random sources
Salla G. Reddy, Ashok Kumar, Shashi Prabhakar, and R. P. Singh
Optics Letters 38, 4441-4444 (2013)

Annihilation of vortex dipoles in an oblate Bose-Einstein condensate
Shashi Prabhakar, R. P. Singh, Sandeep Gautam, and D. Angom
Jounal of Physics B 46, 125302 (2013)

Stability of higher order optical vortices produced by spatial light modulators
Ashok Kumar, Pravin Vaity, Jitendra Bhatt, and R. P. Singh
Journal of Modern Optics 60, 1-5 (2013)

Propagation of vortex beams through self-assembled photonic crystal
Sunita Kedia, Ashok Kumar, and R. P. Singh
Journal of Experimental Nanoscience 8, 249-253 (2013)

Displacement gain dependent fidelity in quantum teleportation using entangled two-mode squeezed light
D. K. Giri, R. P. Singh, and Abir Bandyopadhyay
Opt. Quant. Electron. , 1-11 (2013)

Quadrature uncertainty and information entropy of quantum elliptical vortex states
Anindya Banerji, P. K. Panigrahi, R. P. Singh, S. Chowdhury, and Abir Bandyopadhyay
Journal of Physics A 46, 225303 (2013)


2012
 
Topological charge dependent propagation of optical vortices under quadratic phase transformation
Pravin Vaity and R. P. Singh
Optics Letters 37>, 1301 (2012)

Generation of quadrupoles through instability of dark rings in photorefractive media
Pravin Vaity and R. P. Singh
Journal of the Optical Society of America B 29, 2099 (2012)

Hanbury Brown-Twiss-type experiments with optical vortices and observation of modulated intensity correlation on scattering from rotating ground glass
Ashok Kumar, J. Banerji, and R. P. Singh
Physical Review A 86, 013825 (2012)

Investigation of local structural properties of self-assembled photonic crystals by optical diffraction
Sunita Kedia, Ashok Kumar, and R. P. Singh
Applied Physics B 108, 903-907 (2012)


2011
 
Revealing the order of a vortex through its intensity record
Shashi Prabhakar, Ashok Kumar, J. Banerji, and R. P. Singh
Optics Letters 36, 4398-4400 (2011)

Self-healing property of optical ring lattice
Pravin Vaity, and R. P. Singh
Optics Letters 36, 2994-2996 (2011)

Making optical vortex and its copies using a single spatial light modulator
Ashok Kumar, Pravin Vaity, J. Banerji, and R. P. Singh
Physics Letters A 375, 3634-3640 (2011)

Information content of optical vortex field
Ashok Kumar, Shashi Prabhakar, Pravin Vaity, and R. P. Singh
Optics Letters 36, 1161-1163 (2011)

Crafting the core asymmetry to lift the degeneracy of optical vortices
Ashok Kumar, Pravin Vaity, and R. P. Singh
Optics Express 19, 6182-6190 (2011)

Entanglement of a quantum optical elliptic vortex
Abir Bandyopadhyay, Shashi Prabhakar, and R. P. Singh
Physics Letters A 375, 1926-1929 (2011)

    Review Articles
    1. R. P. Singh,
      Static and dynamic light scattering by aerosols in a controlled environment,
      Light Scattering Reviews 4, pp. 469-509 (2009).

    2. R. P. Singh, Ashok Kumar, and Jitendra Bhatt,
      Vortices of Light: Generation, Characterization and Applications,
      Progress in Nonlinear Optics Research, eds. Takahasi, M., Goto, H., Nova Science, NewYork, pp. 359-381 (2008).

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