8 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…