Thursday, July 5, 2012

1201.3940 (Rafal Demkowicz-Dobrzanski et al.)

The elusive Heisenberg limit in quantum enhanced metrology    [PDF]

Rafal Demkowicz-Dobrzanski, Jan Kolodynski, Madalin Guta
We provide efficient and intuitive tools for deriving bounds on achievable precision in quantum enhanced metrology based on the geometry of quantum channels and semi-definite programming. We show that when decoherence is taken into account, the maximal possible quantum enhancement amounts generically to a constant factor rather than quadratic improvement. We apply these tools to derive bounds for models of decoherence relevant for metrological applications including: dephasing,depolarization, spontaneous emission and photon loss.
View original: http://arxiv.org/abs/1201.3940

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