Spatial multimode entanglement within one laser beam

Details Spatial multimode entanglement within one laser beam Spatial multimode entanglement within one laser beam

2008-12-26

arxiv.org/abs/0812.4686v1

Physics

Quantum Physics

7 pages, 3 figures

Scientific paper

Optical entanglement is a key requirement for many quantum communication protocols. Conventionally entanglement is formed between two distinct beams, with the quantum correlations being measured at separate locations. We show entanglement between the modes within one beam. Our technique is particularly elegant and a major advance towards practical systems with minimum complexity. We demonstrate three major experimental achievements: (i) only one source is required to produce squeezed light in two orthogonal spatial modes, (ii) the entanglement is formed through lenses and beam rotation, without the need of a beam splitter and (iii) the quantum correlations are measured directly and simultaneously using a multi pixel, quadrant detector.

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