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Frontiers in Optics

Quantum engineering for spatial control of entangled two-photon states

Juan P. Torres, Silvia Carrasco, Clara I. Osorio, Lluís Torner

Published Jan 1, 2004• 0 citations
Publisher

Abstract

We put forward several techniques to engineer the spatial structure of entangled two-photon states in spontaneous parametric down-conversion, namely the direct manipulation of the pump beam, quasi-phase-matching engineering and the use of highly non-collinear configurations.
DOI
10.1364/fio.2004.fmc4

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The ability to engineer the properties of quantum optical states is essential for quantum information processing applications. Here, we demonstrate tunable control of spatial correlations between photon pairs produced by spontaneous parametric down-conversion. By shaping the spatial pump beam profile in a type-I collinear configuration, we tailor the spatial structure of coincidences between photon pairs entangled in high dimensions, without effect on intensity. The results highlight fundamental aspects of spatial coherence and hold potential for the development of quantum technologies based on high-dimensional spatial entanglement.
The ability to engineer the properties of quantum optical states is essential for quantum information processing applications. Here, we demonstrate tunable control of spatial correlations between photon pairs produced by spontaneous parametric down-conversion, and measure them using an electron multiplying charge coupled device (EMCCD) camera. By shaping the spatial pump beam profile in a type-I collinear configuration, we tailor the spatial structure of coincidences between photon pairs entangled in high dimensions without effect on intensity. The results highlight fundamental aspects of spatial coherence and hold potential for the development of quantum technologies based on high-dimensional spatial entanglement.