Adaptive optical phase estimation using time-symmetric quantum smoothing.

  title={Adaptive optical phase estimation using time-symmetric quantum smoothing.},
  author={T. A. Wheatley and Dominic W. Berry and Hidehiro Yonezawa and Daisuke Nakane and Hajime Arao and Damian Pope and Timothy C. Ralph and H. M. Wiseman and Akira Furusawa and Elanor Harriet Huntington},
  journal={Physical review letters},
  volume={104 9},
Quantum parameter estimation has many applications, from gravitational wave detection to quantum key distribution. The most commonly used technique for this type of estimation is quantum filtering, using only past observations. We present the first experimental demonstration of quantum smoothing, a time-symmetric technique that uses past and future… CONTINUE READING