302 citations · 3k across the 71 of their papers we have counts for
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Intrinsic degree of coherence of classical and quantum states
Abu S Musa Patoary, Girish Kulkarni, Anand K. Jha
In the context of the 2-dimensional (2D) polarization states of light, the degree of polarization P2 is equal to the maximum value of the degree of coherence over all possible base…
Angular Schmidt spectrum of entangled photons: derivation of an exact formula and experimental characterization for non-collinear phase matching
Girish Kulkarni, Lavanya Taneja, Shaurya Aarav +1
We derive an exact formula for the angular Schmidt spectrum of the orbital angular momentum (OAM)-entangled states produced by parametric down-conversion (PDC). We show that our fo…
Self-shielding of hydrogen in the IGM during the epoch of reionization
Jonathan Chardin, Girish Kulkarni, Martin G. Haehnelt
We investigate self-shielding of intergalactic hydrogen against ionizing radiation in radiative transfer simulations of cosmic reionization carefully calibrated with Lyman alpha fo…
Measurement of the small-scale structure of the intergalactic medium using close quasar pairs
Alberto Rorai, Joseph F. Hennawi, Jose Oñorbe +6
The distribution of diffuse gas in the intergalactic medium (IGM) imprints a series of hydrogen absorption lines on the spectra of distant background quasars known as the Lyman-…
Transfer of temporal coherence in parametric down-conversion
Girish Kulkarni, Prashant Kumar, Anand K. Jha
We show that in parametric down-conversion the coherence properties of a temporally partially coherent pump field get entirely transferred to the down-converted entangled two-photo…
Large 21 cm signals from AGN-dominated reionization
Girish Kulkarni, Tirthankar Roy Choudhury, Ewald Puchwein +1
We present here predictions for the spatial distribution of 21 cm brightness temperature fluctuations from high-dynamic-range simulations for AGN-dominated reionization histories t…