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Phys Rev Lett. 2008 Feb 15;100(6):060504. Epub 2008 Feb 14.

Manipulating biphotonic qutrits.

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1
Department of Physics and Centre for Quantum Computer Technology, University of Queensland, Brisbane, Australia.

Abstract

Quantum information carriers with higher dimension than the canonical qubit offer significant advantages. However, manipulating such systems is extremely difficult. We show how measurement-induced nonlinearities can dramatically extend the range of possible transforms on biphotonic qutrits-three-level quantum systems formed by the polarization of two photons in the same spatiotemporal mode. We fully characterize the biphoton-photon entanglement that underpins our technique, thereby realizing the first instance of qubit-qutrit entanglement. We discuss an extension of our technique to generate qutrit-qutrit entanglement and to manipulate any bosonic encoding of quantum information.

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