19 citations · 43 across the 14 of their papers we have counts for
14 papers
Non-monotonic dependence of OAM Schmidt spectrum on crystal thickness
Harshal Jain, Suman Karan, Radhika Prasad +1
The orbital angular momentum (OAM) of photons provides a high-dimensional resource for quantum information protocols. The dimensionality of OAM-entangled states generated via spont…
Measuring the complete set of spatial Schmidt modes of entangled two-photon fields
Radhika Prasad, Nilakshi Senapati, Abhinandan Bhattacharjee +2
Spontaneous parametric down-conversion (SPDC) is the most widely-used source of high-dimensional entangled two-photon states, and the entanglement in the spatial degree of freedom…
OAM-mode sorting with a wavefront twister
Suman Karan, Swati Chaudhary, Harshwardhan Wanare +1
We propose an OAM sorter based on a novel optical element that we refer to as a wavefront twister. It is a generalization of the conventional wavefront rotators such as the Dove pr…
Polarization-preserving wavefront rotator
Suman Karan, Aman Srivastava, Pratham Sachin Todkar +1
A K-mirror rotates the wavefront of an incident optical field. However, the rotation always introduces polarization changes in the transmitted field. This is a serious concern for…
Observation of OAM non-conservation in entangled photon generation
Suman Karan, Anand K. Jha
Orbital angular momentum (OAM)-entangled states produced by spontaneous parametric down-conversion (SPDC) are considered ideal for realizing high-dimensional entangled states, whic…
An experimental technique for measuring radial coherence
Radhika Prasad, Nilakshi Senapati, Suman Karan +4
Coherence refers to correlations between field vibrations at two separate points in degrees of freedom such as space, time, and polarisation. In the context of space, coherence the…
Broadband uniform-efficiency OAM-mode detector
Suman Karan, Martin P. Van Exter, Anand K. Jha
The high-dimensional basis of orbital angular momentum (OAM) has several added and unique advantages for photonics quantum technologies compared to the polarization basis, which is…
Structured position-momentum entangled two-photon fields
Radhika Prasad, Sanjana Wanare, Suman Karan +3
Structured optical fields have led to several ground-breaking techniques in classical imaging and microscopy. At the same time, in the quantum domain, position-momentum entangled p…
A wavefront rotator with near-zero mean polarization change
Suman Karan, Nilakshi Senapati, Anand K. Jha
A K-mirror is a device that rotates the wavefront of an incident optical field. It has recently gained prominence over Dove prism, another commonly used wavefront rotator, due to t…
Quantifying polarization changes induced by rotating Dove prisms and K-mirrors
Suman Karan, Ruchi, Pranay Mohta +1
Dove prisms and K-mirrors are devices extensively used for rotating the wavefront of an optical field. These devices have several applications, including measurement of orbital ang…
Postselection-free controlled generation of a high-dimensional orbital-angular-momentum entangled state
Suman Karan, Radhika Prasad, Anand K. Jha
High-dimensional entangled states in orbital angular momentum (OAM) basis offer several unique advantages for quantum information applications. However, for the optimal performance…
Propagation-induced entanglement revival
Abhinandan Bhattacharjee, Mritunjay K. Joshi, Suman Karan +2
The practical implementation of free-space quantum information tasks requires entanglement to be sustained over long distances and in the presence of turbulent and noisy environmen…
Measurement of pure states of light in the orbital-angular-momentum basis using nine multipixel image acquisitions
Girish Kulkarni, Suman Karan, Anand K. Jha
The existing techniques for measuring high-dimensional pure states of light in the orbital angular momentum (OAM) basis either involve a large number of single-pixel data acquisiti…
Phase matching in -barium borate crystals for spontaneous parametric down-conversion
Suman Karan, Shaurya Aarav, Homanga Bharadhwaj +5
Spontaneous parametric down-conversion (SPDC) is the most widely used process for generating entangled photon pairs. In SPDC, a pump photon interacts with a nonlinear optical cryst…