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Tools for detecting entanglement between different degrees of freedom in quadrature squeezed cylindrically polarized modes

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons201066

Gabriel,  C.
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons200999

Aiello,  A.
Optical Quantum Information Theory, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons201015

Berg-Johansen,  S.
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons201126

Marquardt,  Ch
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons201115

Leuchs,  G.
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Gabriel, C., Aiello, A., Berg-Johansen, S., Marquardt, C., & Leuchs, G. (2012). Tools for detecting entanglement between different degrees of freedom in quadrature squeezed cylindrically polarized modes. EUROPEAN PHYSICAL JOURNAL D, 66(7): 172. doi:10.1140/epjd/e2012-20735-y.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-68B9-3
Abstract
Quadrature squeezed cylindrically polarized modes contain entanglement not only in the polarization and spatial electric field variables but also between these two degrees of freedom [C. Gabriel et al., Phys. Rev. Lett. 106, 060502 (2011)]. In this paper we present tools to generate and detect this entanglement. Experimentally we demonstrate the generation of quadrature squeezing in cylindrically polarized modes by mode transforming a squeezed Gaussian mode. Specifically, -1.2dB +/- 0.1 dB of amplitude squeezing are achieved in the radially and azimuthally polarized mode. Furthermore, theoretically it is shown how the entanglement contained within these modes can be measured and how strong the quantum correlations are, depending on the measurement scheme.