Entanglement for metrology with atomic ensembles

  title={Entanglement for metrology with atomic ensembles},
  author={Eugene Simon Polzik},
  journal={2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum electronics and Laser Science Conference},
Ultimate quantum fluctuations which limit the fundamental precision in metrology can be only reduced by entanglement of particles. In particular, squeezing of the fluctuations called the spin projection noise by means of generation of entanglement in an ensemble of atoms can improve the precision of spectroscopy and of atomic clocks. A powerful tool for generation of multiparticle entanglement is a quantum nondemolition measurement (QND). We will describe the fundamentals of QND measurement of… CONTINUE READING