Publications
Some highlights
In any given degree of freedom (DOF), pump coherence is necessary for generating entanglement in that particular DOF. But does a lack of coherence in one DOF prevent entanglement generation in other DOFs? The answer is no. Here, we show the generation of polarization-entangled photons from spatiotemporally highly incoherent light.
C. Li, B. Braverman, G. Kulkarni, R. W. Boyd
Phys. Rev. A 107, L041701 (2023)[PDF]
In 1935, E. Schrodinger referred to quantum entanglement as “not one but rather the characteristic trait of quantum mechanics, the one that enforces its complete departure from classical lines of thought.” At present, most fundamental quantum optics experiments and practical quantum technologies use SPDC for generating entangled states. We show that SPDC-related effects that rely only on intensity measurements can be modeled using classical lines of thought.
G. Kulkarni, J. Rioux, B. Braverman, M. V. Chekhova, R. W. Boyd
Phys. Rev. Research 4, 033098 (2022)[PDF]
How can one measure an unknown light field that is some coherent superposition of different OAM states? We show that by interfering the field with a rotated copy of itself and recording the interference patterns for a few judiciously chosen combinations of rotation angles and phase differences, one can reconstruct the state of the unknown field using a recursive algorithm.
G. Kulkarni, S. Karan, A. K. Jha
Phys. Rev. Applied 13, 054077 (2020)[PDF]
How can one measure an unknown light field that is some incoherent superposition of different OAM states? We show that by interfering the field with a flipped copy of itself and recording the constructive and destructive interference patterns, one can reconstruct the state of the unknown field. We then use this method to characterize the high-dimensional spatial entanglement generated in SPDC.
G. Kulkarni, R. Sahu, O. S. Magana-Loaiza, R. W. Boyd, A. K. Jha
Nature Communications 8 1054 (2017)[PDF]
List of publications
Rapid comprehensive characterization of biphoton spatial-polarization hyperentanglement
C. Li, G. Kulkarni, I. Soward, Y. Zhang, J. Upham, D. England, A. Nomerotski, E. Karimi, R. W. Boyd
arXiv:2502.03586[PDF]
Efficient characterization of spatial Schmidt modes of multiphoton entangled states produced from high-gain parametric down-conversion
M. Amooei, G. Kulkarni, J. Upham, R. W. Boyd
Phys. Rev. A 111, 023714 (2025)[PDF]
Experimental generation of polarization entanglement from spontaneous parametric down-conversion pumped by spatiotemporally highly incoherent light
C. Li, B. Braverman, G. Kulkarni, R. W. Boyd
Phys. Rev. A 107, L041701 (2023)[PDF]
Classical model of spontaneous parametric down-conversion
G. Kulkarni, J. Rioux, B. Braverman, M. V. Chekhova, R. W. Boyd
Phys. Rev. Research 4, 033098 (2022)[PDF]
Phase matching in β-barium borate crystals for spontaneous parametric down-conversion
S. Karan, S. Aarav, H. Bharadhwaj, L. Taneja, A. De, G. Kulkarni, N. Meher, A. K. Jha
Journal of Optics 22, 083501 (2020)[PDF]
Measurement of pure states of light in the orbital-angular-momentum basis using nine multipixel image acquisitions
G. Kulkarni, S. Karan, A. K. Jha
Phys. Rev. Applied 13, 054077 (2020)[PDF]
Intrinsic degree of coherence of two-qubit states and measures of two-particle quantum correlations
N. Meher, A. S. M. Patoary, G. Kulkarni, A. K. Jha
Journ. Opt. Soc. Am. B 37, 1224 (2020)[PDF]
Intrinsic degree of coherence of classical and quantum states
A. S. M. Patoary, G. Kulkarni, A. K. Jha
Journ. Opt. Soc. Am. B 36(10), 2765 (2019)[PDF]
Angular Schmidt spectrum of entangled photons derivation of an exact formula and experimental characterization for non-collinear phase matching
G. Kulkarni, L. Taneja, S. Aarav, A. K. Jha
Phys. Rev. A 97, 063846 (2018)[PDF]
Single-shot measurement of the orbital angular momentum spectrum of light
G. Kulkarni, R. Sahu, O. S. Magana-Loaiza, R. W. Boyd, A. K. Jha
Nature Communications 8 1054 (2017)[PDF]
Transfer of temporal coherence in parametric downconversion
G. Kulkarni, P. Kumar, A. K. Jha
J. Opt. Soc. Am. B 34(8), 1637-1643 (2017)[PDF]
Intrinsic upper bound on two-qubit polarization entanglement predetermined by pump polarization correlations in parametric down-conversion
G. Kulkarni, V. Subrahmanyam, A. K. Jha
Phys. Rev. A 93, 063842 (2016)[PDF]