Every imaging system has a resolution limit, typically defined by Rayleigh's criterion. Given a
fixed number of photons, the amount of information one can gain from an image about the
separation between two sources falls to zero as the separation drops below this limit, an
effect dubbed “Rayleigh's curse.” Recently, in a quantum-information–inspired proposal,
Tsang and co-workers found that there is, in principle, infinitely more information present in
the full electromagnetic field in the image plane than in the intensity alone, and suggested …

Any imaging device such as a microscope or telescope has a resolution limit, a minimum
separation it can resolve between two objects or sources; this limit is typically defined by"
Rayleigh's criterion", although in recent years there have been a number of high-profile
techniques demonstrating that Rayleigh's limit can be surpassed under particular sets of
conditions. Quantum information and quantum metrology have given us new ways to
approach measurement; a new proposal inspired by these ideas has now re-examined the …