An interferometric experiment is described that characterizes an optical cat state in a cavity mode. Our method describes how to measure the amplitude and phase of the different coherent states that make up the cat states. We show that using a recently proposed quantum nondemolition measurement technique, we can circumvent the problem of decoherence inherent in measurement involving superposition of coherent states.
@article{arxiv.1706.09448,
title = {Taming an Optical Schroedinger's cat - A quantum non-demolition approach},
author = {Marvellous Onuma-Kalu and Kae Nemoto and W. J. Munro and Robert B. Mann},
journal= {arXiv preprint arXiv:1706.09448},
year = {2017}
}