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ReportsA Quantum Laser PointerThe measurement sensitivity of the pointing direction of a laser beam is ultimately limited by the quantum nature of light. To reduce this limit, we have experimentally produced a quantum laser pointer, a beam of light whose direction is measured with a precision greater than that possible for a usual laser beam. The laser pointer is generated by combining three different beams in three orthogonal transverse modes, two of them in a squeezed-vacuum state and one in an intense coherent field. The result provides a demonstration of multichannel spatial squeezing, along with its application to the improvement of beam positioning sensitivity and, more generally, to imaging.
1 Australian Research Council Centre of Excellence for Quantum-Atom Optics, the Australian National University, Canberra ACT 0200, Australia. * To whom correspondence should be addressed. E-mail: nicolas.treps{at}spectro.jussieu.fr
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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