Fundamental Limits of Classical and Quantum Imaging
Physical Review Letters 109, 123601 (2012)
Quantum imaging promises increased imaging performance over classical protocols. However, there are a number of aspects of quantum imaging that are not well understood. In particular, it has so far been unknown how to compare classical and quantum imaging procedures. Here, we consider classical and quantum imaging in a single theoretical framework and present the fundamental limit on the resolution in the form of Cramér-Rao bounds for classical and quantum imaging. The resolution can be estimated from the image itself. We present a utility function that allows us to compare imaging protocols in a wide range of applications.