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Author (up) Yonezawa, H.; Nakane, D.; Wheatley, T.A.; Iwasawa, K.; Takeda, S.; Arao, H.; Ohki, K.; Tsumura, K.; Berry, D.W.; Ralph, T.C.; Wiseman, H.M.; Huntington, E.H.; Furusawa, A. openurl 
  Title Quantum-Enhanced Optical-Phase Tracking Type Journal Article
  Year 2012 Publication SCIENCE Abbreviated Journal Science  
  Volume 337 Issue 6101 Pages 1514-1517  
  Keywords  
  Abstract Tracking a randomly varying optical phase is a key task in metrology, with applications in optical communication. The best precision for optical-phase tracking has until now been limited by the quantum vacuum fluctuations of coherent light. Here, we surpass this coherent-state limit by using a continuous-wave beam in a phase-squeezed quantum state. Unlike in previous squeezing-enhanced metrology, restricted to phases with very small variation, the best tracking precision (for a fixed light intensity) is achieved for a finite degree of squeezing because of Heisenberg's uncertainty principle. By optimizing the squeezing, we track the phase with a mean square error 15 +/- 4% below the coherent-state limit.  
  Address [Wiseman, Howard M.] Griffith Univ, Ctr Quantum Dynam, Brisbane, Qld 4111, Australia, Email: h.wiseman@griffith.edu.au;  
  Corporate Author Thesis  
  Publisher AMER ASSOC ADVANCEMENT SCIENCE Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0036-8075 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000308912900045 Approved no  
  Call Number IQC @ it @ Serial 2877  
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