13 citations · 17 across the 7 of their papers we have counts for
8 papers
Algebraic Characterization of Biphoton Spatial-Mode Entanglement in Higher-Order Laguerre--Gaussian-Pumped SPDC
Takumi Jinushi, Hirokazu Kobayashi
High-dimensional spatial entanglement generated via spontaneous parametric down-conversion (SPDC) provides a powerful resource for quantum information processing, yet its mode stru…
Quantum Gouy phase singularities in a propagating biphoton state
Takumi Jinushi, Hirokazu Kobayashi
Phase singularities are topological defects around which the phase winds by an integer multiple of . In entangled multiphoton states, they can emerge nonlocally in the joint wa…
Comparative analysis of wavenumber response in phase contrast and spiral phase imaging systems for plasma diagnostics
Jigme Zangpo, Hirokazu Kobayashi, Haruki Kawaguchi +1
Phase contrast imaging (PCI) has been used for decades to study plasma density fluctuations, but its wavenumber response is constrained by the phase plate groove width and beam…
Phase-edge imaging using q-plate shifts for faster and simpler microscopy
Jigme Zangpo, Hirokazu Kobayashi, Ryo Yasuhara
We present a simplified method for isolating the edges of a phase object from the edges of an amplitude object using a 4f system with an off-axis q-plate. Instead of the four off-a…
Optical response of edge modes in time-reversal symmetric topological superconductors
Hirokazu Kobayashi, Han Bi, James Jun He +1
Topological superconductors and Majorana edge modes at their boundaries have been theoretically predicted. However, their experimental observation remains controversial. Recent the…
Single-pixel edge enhancement of object via convolutional filtering with localized vortex phase
Jigme Zangpo, Hirokazu Kobayashi
Microscopy is an essential tool in imaging research, and the edge-enhanced microscope by using the vortex filter is of particular interest as an optical information processing that…
Isolation of phase edges using off-axis q-plate filters
Jigme Zangpo, Hirokazu Kobayashi
Edge-enhanced microscopes with q-plate have been attracted more attention to enhance the edges of phase-amplitude objects in biological sample due to their capability for all-direc…
Edge-Enhanced Microscopy of Comlplex Object using Scalar and Vectorial Vortex Filtering
Jigme Zangpo, Tomohiro Kawabe, Hirokazu Kobayashi
Recently, system containing a q-plate has been used to perform edge detection and enhancement of amplitude and phase objects. However, only few studies have concentrated on ed…