Abstract
It is widely recognized that the shot-noise, which limits the precision of standard interferometric measurements, can be overcome by employing non-classical states such as the so-called NOON state [1]. The enhanced precision comes however at the cost of increased susceptibility to interactions with the external environment, with the important example of photon loss, which may quickly render NOON states completely useless [2]. In a realistic scenario, phase sensitivity needs to be combined with robustness against decoherence.
© 2009 IEEE
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