We show that an electrostatic qubit located near a Bose-Einstein condensate trapped in a symmetric double-well potential can be used to measure the duration the qubit has spent in one of its quantum states. The stronq, medium and weak measurement regimes are analysed and a new type of Zeno effect is discussed. The analogy between the residence and the traversal (tunnelling) times is highlighted.
@article{arxiv.0812.4072,
title = {Qubit residence time measurements with a Bose-Einstein condensate},
author = {D. Sokolovski},
journal= {arXiv preprint arXiv:0812.4072},
year = {2015}
}