We present a method of measuring the quantum state of a harmonic oscillator through instantaneous probe-system selective interactions of the Jaynes-Cummings type. We prove that this scheme is robust to general decoherence mechanisms, allowing the possibility of measuring fast-decaying systems in the weak-coupling regime. This method could be applied to different setups: motional states of trapped ions, microwave fields in cavity/circuit QED, and even intra-cavity optical fields.
@article{arxiv.quant-ph/0606004,
title = {Noise-Free Measurement of Harmonic Oscillators with Instantaneous Interactions},
author = {M. Franca Santos and G. Giedke and E. Solano},
journal= {arXiv preprint arXiv:quant-ph/0606004},
year = {2015}
}
Comments
4 pages, no figure, published in Physical Review Letters