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Optics InfoBase Conference Papers

Joint polarization and spatial-mode entanglement of photons

Julio T. Barreiro, Nicholas A. Peters, Paul G. Kwiat, Nathan K. Langford, Andrew G. White

Published Jan 1, 2006• 0 citations
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Abstract

Simultaneous multidimensional entanglement can improve quantum communi-cation protocols, measurements and fundamental studies. Using photons from parametric downconversion, we demonstrate a source of joint polarization and spatial-mode entangle-ment, and characterize the state by tomographic reconstruction.

Related papers

Joint polarization and spatial-mode entanglement of photons

Julio T. Barreiro, Nicholas A. Peters, Paul G. Kwiat

Simultaneous multidimensional entanglement can improve quantum communication protocols, measurements and fundamental studies. Using photons from parametric downconversion, we demonstrate a source of joint polarization and spatial-mode entanglement, and characterize the state by tomographic reconstruction.

Quantum Electronics and Laser Science Conference•Dec 10, 2005•0 citations

JointPolarization andSpatial-Mode Entanglement ofPhotons

Julio T. Barreiro

Simultaneous multidimensional entanglement canimprove quantumcommuni- cation protocols, measurements andfundamental studies. Usingphotons fromparametric downconversion, wedemonstrate asource ofjoint polarization andspatial-mode entangle- ment,andcharacterize thestate bytomographic reconstruction. @2005Optical Society ofAmerica OCIScodes:(270.1670) Coherent optical effects; (090.1760) Computer holography

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We have discovered theoretically and confirmed experimentally that a vast improvement over the traditional (type-I) downconversion sources (in which both correlated photons have the same polarization) is possible by using type-II downconversion (in which the correlated photons are orthogonally polarized).1 In previous systems it was necessary to use a number of very carefully aligned extra optical elements, beam splitters, mirrors, etc., to obtain and measure the quantum-mechanical entangled states required for many fundamental experiments.2,3

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Hyper-entangled photons

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We experimentally demonstrate the first quantum system entangled in every degree of freedom (hyper-entangled). Using pairs of photons produced in spontaneous parametric downconversion, we verify entanglement by observing a Bell-type inequality violation in each degree of freedom: polarization, spatial mode and time-energy. We also produce and characterize maximally hyper-entangled states and novel states simultaneously exhibiting both quantum and classical correlations. Finally, we report the tomography of a 2x2x3x3 system (36-dimensional Hilbert space), which we believe is the first reported entangled system of this size to be so characterized.

Frontiers in Optics•Jan 1, 2005•0 citations
We have discovered theoretically and confirmed experimentally that a vast improvement over the traditional (type-I) downconversion sources (in which both correlated photons have the same polarization) is possible by using type-II downconversion (in which the correlated photons are orthogonally polarized).1 In previous systems it was necessary to use a number of very carefully aligned extra optical elements, beam splitters, mirrors, etc., to obtain and measure the quantum-mechanical entangled states required for many fundamental experiments.2,3
We experimentally demonstrate the first quantum system entangled in every degree of freedom (hyper-entangled). Using pairs of photons produced in spontaneous parametric downconversion, we verify entanglement by observing a Bell-type inequality violation in each degree of freedom: polarization, spatial mode and time-energy. We also produce and characterize maximally hyper-entangled states and novel states simultaneously exhibiting both quantum and classical correlations. Finally, we report the tomography of a 2x2x3x3 system (36-dimensional Hilbert space), which we believe is the first reported entangled system of this size to be so characterized.