Simultaneous quantum state measurements using array detection
M. Beck, Physical Review Letters, 84, 5748-5751 (2000)
Abstract
I propose a method for measuring the quantum state of an optical field that occupies
a mode having a complicated spatial structure.
The technique uses array detectors and a single, plane-wave local
oscillator beam. The advantage of using
array detectors is that the local oscillator is not mode matched to the
field being measured, yet the deleterious effects of this mismatch on the
effective detection efficiency are greatly reduced compared to using single
detectors. Indeed, when the spatial
mode of the signal field is describable by a real function, the effective
mode-matching efficiency is unity.