Abstract
We demonstrate experimentally a measurement scheme for the Stokes operators for the continuous-variable squeezed states of orbital angular momentum (OAM). An OAM squeezed state is generated by coupling a dim Hermite-Gauss HG01-mode quadrature-squeezed light beam with a bright HG10-mode coherent light beam on a 98/2 beam splitter. Using an asymmetric Mach–Zehnder interferometer with an extra Dove prism in one arm, we measured the three orbital Stokes operators of the OAM squeezed states with a self-homodyne detection and finally characterized their positions and noise on the orbital Poincaré sphere.
Highlights
Propagating light beams carry spin angular momenta (SAM) associated with the polarizations and orbital angular momenta (OAM) related to the spatial helical phase structures[1]
This scheme is more convenient to operate in experiments, and the set-up is broadly applicable to the first-order orbital angular momentum (OAM) states
To measure the three orbital Stokes operators, we propose a scheme based on the asymmetric Mach– Zehnder interferometer with a Dove prism in one arm
Summary
Propagating light beams carry spin angular momenta (SAM) associated with the polarizations and orbital angular momenta (OAM) related to the spatial helical phase structures[1]. In refs 13 and 15, the squeezing and entanglement of the orbital Stokes operators were inferred from the measured quadrature squeezing and entanglement of Hermite–Gauss and Laguerre–Gauss modes based on balanced homodyne detection with spatially tailored local oscillators.
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