• DOI:10.1126/SCIENCE.1086489
• Corpus ID: 16450066

A Quantum Laser Pointer

@article{Treps2003AQL,
  title={A Quantum Laser Pointer},
  author={Nicolas Treps and Nicolai B. Grosse and Warwick Paul Bowen and Claude Fabre and Hans-A. Bachor and Ping Koy Lam},
  journal={Science},
  year={2003},
  volume={301},
  pages={940 - 943}
}

• N. Treps, N. Grosse, +3 authors P. Lam
• Published 15 August 2003
• Physics
• Science

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.