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

Gabriel, Christian; Aiello, Andrea; Berg-Johansen, Stefan; Marquardt, Christoph; Leuchs, Gerd

doi:10.1140/epjd/e2012-20735-y

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…This was supported strongly by Ghose and Samal [21] in 2001. An early experimental report by Lee and Thomas [22] came in 2002 and other experimental and theoretical treatments appeared in the following decade [8,9,[23][24][25][26][27][28][29][30]. Interest in the issues raised by classical entanglement continues to grow.…”

Section: Coherence and Entanglementmentioning

confidence: 99%

Correlation, coherence and context

Eberly

2016

Laser Phys.

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The modern theory of coherence is based on correlation functions. A generic example could be written ⟨ ( ) ( )⟩ * V t V t 1 2 , denoting an average of products of the values of a signal V(t) at two specified times. Here we infer that t is a degree of freedom that the signal depends on. Typically, physical variables depend on more than one degree of freedom, and recognition of this has prompted attention to some interesting questions for the correlation functions and the several coherences that can be attributed to the same optical field. We examine some of the questions arising from the standpoint of experimental contexts. Degree of polarizability and degree of entanglement (classical non-separability) can serve as starting points for quantitative assignments.

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Section: Coherence and Entanglementmentioning

confidence: 99%

Correlation, coherence and context

Eberly

2016

Laser Phys.

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“…Experimental tools for squeezing and entangling spin and orbital degrees of freedom were developed in Refs. [33,34].…”

Section: Introductionmentioning

confidence: 99%

Quantum and classical separability of spin-orbit laser modes

2014

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In this work we investigate the quantum noise properties of polarization vortices in connection with an intensity based Clauser-Horne-Shimony-Holt inequality for their spin-orbit separability. We evaluate the inequality for different input quantum states and the corresponding intensity fluctuations. The roles played by coherence and photon number squeezing provide a suitable framework for characterizing pure state spin-orbit entanglement. Structural inseparability of the spin-orbit mode requires coherence, an issue concerning either classical or quantum descriptions. In both cases, it can be witnessed by violation of this intensity based CHSH inequality. However, in the quantum domain, entanglement requires both coherence and reduced photon number fluctuations.Comment: 7 pages, 3 figure

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“…where the wavelength and designated mode are fixed, or with special-purpose liquid crystal devices [37], which allow more flexibility in the choice of wavelength and mode parameters. Another approach uses programmable adaptive optics, for which, although capable in principle of generating any mode, squeezing has so far only been demonstrated in 1D with Hermite-Gauss HG n0 modes [38].…”

Section: Existing Experimental Approachesmentioning

confidence: 99%

Single-mode squeezing in arbitrary spatial modes

Semmler¹,

Berg-Johansen²,

Chille³

et al. 2016

Opt. Express

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Abstract:As the generation of squeezed states of light has become a standard technique in laboratories, attention is increasingly directed towards adapting the optical parameters of squeezed beams to the specific requirements of individual applications. It is known that imaging, metrology, and quantum information may benefit from using squeezed light with a tailored transverse spatial mode. However, experiments have so far been limited to generating only a few squeezed spatial modes within a given setup. Here, we present the generation of single-mode squeezing in Laguerre-Gauss and Bessel-Gauss modes, as well as an arbitrary intensity pattern, all from a single setup using a spatial light modulator (SLM). The degree of squeezing obtained is limited mainly by the initial squeezing and diffractive losses introduced by the SLM, while no excess noise from the SLM is detectable at the measured sideband. The experiment illustrates the single-mode concept in quantum optics and demonstrates the viability of current SLMs as flexible tools for the spatial reshaping of squeezed light.

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

Cited by 9 publications

References 33 publications

Correlation, coherence and context

Correlation, coherence and context

Quantum and classical separability of spin-orbit laser modes

Single-mode squeezing in arbitrary spatial modes

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