Angular degrees of freedom in twin-beam parametric down-conversion

2012 ◽  
Vol 101 (12) ◽  
pp. 121114 ◽  
Author(s):  
Martin Levenius ◽  
Valdas Pasiskevicius ◽  
Katia Gallo
Keyword(s):  
Degrees Of Freedom ◽  
Parametric Down Conversion ◽  
Twin Beam ◽  
Down Conversion

scholarly journals Quantum enhanced imaging of nonuniform refractive profiles

2019 ◽  
Vol 17 (08) ◽  
pp. 1941010 ◽  
Author(s):  
Giuseppe Ortolano ◽  
Ivano Ruo-Berchera ◽  
Enrico Predazzi
Keyword(s):  
The Other ◽  
Quantum Metrology ◽  
Experimental Demonstration ◽  
Similar Model ◽  
Spatial Profile ◽  
Parametric Down Conversion ◽  
Twin Beam ◽  
Down Conversion ◽  
Multimode Beams ◽  
Enhanced Imaging

In this work, quantum metrology techniques are applied to the imaging of objects with a nonuniform refractive spatial profile. A sensible improvement on the classical accuracy is shown to be found when the “Twin Beam (TWB) State” is used. In particular, exploiting the multimode spatial correlation, naturally produced in the Parametric Down Conversion (PDC) process, allows a 2D reconstruction of complex spatial profiles, thus enabling an enhanced imaging. The idea is to use one of the spatially multimode beams to probe the sample and the other as a reference to reduce the noise. A similar model can also be used to describe wave front distortion measurements. The model is meant to be followed by a first experimental demonstration of such enhanced measurement scheme.

Azimuthal spectrum after parametric down-conversion with radial degrees of freedom

2014 ◽  
Author(s):  
Yingwen Zhang ◽  
Filippus S. Roux ◽  
Melanie McLaren ◽  
Andrew Forbes
Keyword(s):  
Degrees Of Freedom ◽  
Parametric Down Conversion ◽  
Down Conversion

EFFICIENT POLARIZATION ENTANGLEMENT GENERATION FROM SPATIALLY CORRELATED PHOTONS

2009 ◽  
Vol 07 (04) ◽  
pp. 795-800
Author(s):  
BIN GU ◽  
CHUAN-QI LI ◽  
YU-LIN CHEN
Keyword(s):  
Degrees Of Freedom ◽  
Beam Splitter ◽  
Practical Application ◽  
Entanglement Generation ◽  
Spatially Correlated ◽  
Parametric Down Conversion ◽  
Down Conversion ◽  
Polarizing Beam Splitter

We present an efficient protocol for polarization entanglement generation from spatially correlated photons in spontaneous parametric down-conversion. Compare with the protocol proposed by Shimuzu et al. (Phys. Rev. A77 032338), only one polarizing beam splitter is used in this protocol, which makes it simpler and more convenient in a practical application. By increasing the number of the slits, we provide a way for generation of a hyperentangled state in both the spatial and polarization degrees of freedom.

Generation of Optical—Terahertz Biphotons and Detection of Their Terahertz Component under Frequency-Nondegenerate Parametric Down-Conversion

JETP Letters ◽  
2020 ◽  
Vol 112 (5) ◽  
pp. 269-273
Author(s):  
V. D. Sultanov ◽  
K. A. Kuznetsov ◽  
A. A. Leontyev ◽  
G. Kh. Kitaeva
Keyword(s):  
Parametric Down Conversion ◽  
Down Conversion
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