Squeezing of Atomic Quantum Projection Noise

Patrick Joachim Windpassinger, Daniel Oblak, Ulrich Busk Hoff, Anne Marie Marthe Louchet, Jürgen Appel, Niels Kjærgaard, Eugene S. Polzik

Research output: Contribution to journalJournal articleResearchpeer-review


We provide a framework for understanding recent experiments on squeezing of a collective atomic pseudospin, induced by a homodyne measurement on off-resonant probe light interrogating the atoms. The detection of light decimates the atomic state distribution and we discuss the conditions under which the resulting reduced quantum fluctuations are metrologically relevant. In particular, we consider a dual probe scheme which benefits from a cancelation of classical common mode noise sources such that quantum fluctuations from light and atoms are the main contributions to the detected signal.
Original languageEnglish
JournalJournal of Modern Optics
Issue number18-19
Pages (from-to)1993–1998
Publication statusPublished - 2009
Externally publishedYes


  • Projection noise
  • Quantum noise squeezing
  • Quantum non-demolition measurement


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