Universal unitary gate for single-photon spin-orbit four-dimensional states
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Karimi, Ebrahim
Piccirillo, Bruno
Marrucci, Lorenzo
Santamato, Enrico
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Abstract
The recently demonstrated possibility of entangling opposite values of the orbital angular momentum (OAM) of a photon with its spin enables the realization of nontrivial one-photon spin-orbit four-dimensional states for quantum information purposes. Hitherto, however, an optical device that can able to perform arbitrary unitary transformations on such spin-orbit photon states has not been proposed yet. In this work we show how to realize such a "universal unitary gate" device, based only on the existing optical technology, and describe its operation. Besides the quantum information field, the proposed device may find applications wherever an efficient and convenient manipulation of the combined OAM and spin of light is required.
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Physical Review A (Atomic, Molecular and Optical Physics)
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80
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© 2009 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
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Subject
Mathematical sciences
Physical sciences
Quantum information, computation and communication
Quantum optics and quantum optomechanics
Chemical sciences