Entanglement of Orbital Angular Momentum States of Photons

Details Entanglement of Orbital Angular Momentum States of Photons Entanglement of Orbital Angular Momentum States of Photons

2001-04-13

arxiv.org/abs/quant-ph/0104070v3

Nature, Vol.412, 3123-316 (2001)

Physics

Quantum Physics

4 figures

Scientific paper

10.1038/35085529

So far experimental confirmation of entanglement has been restricted to qubits, i.e. two-state quantum systems including recent realization of three- and four-qubit entanglements. Yet, an ever increasing body of theoretical work calls for entanglement in quantum system of higher dimensions. Here we report the first realization of multi-dimensional entanglement exploiting the orbital angular momentum of photons, which are states of the electromagnetic field with phase singularities (doughnut modes). The properties of such states could be of importance for the efforts in the field of quantum computation and quantum communication. For example, quantum cryptography with higher alphabets could enable one to increase the information flux through the communication channels.

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