Abstract
The 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.
Original language | English |
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Pages (from-to) | 940-943 |
Number of pages | 4 |
Journal | Science |
Volume | 301 |
Issue number | 5635 |
DOIs | |
Publication status | Published - 15 Aug 2003 |