We propose a quantum non-demolition Majorana qubit readout protocol based on parametricmodulation of a longitudinal interaction between a pair of Majorana bound states and a resonator. The interaction can be modulated through microwave frequency gate-voltage or flux control of a tunable tunnel barrier. The qubit-resonator coupling is quantum non-demolition to exponential accuracy, a property inherited from the topological nature of the Majorana zero modes. The same mechanism as used for single-qubit readout can also be extended to perform multi-qubit measurements and be used to enact long range entangling gates.
Cite
@article{arxiv.1809.07776,
title = {Majorana Qubit Readout Using Longitudinal Qubit-Resonator Interaction},
author = {Arne L. Grimsmo and Thomas Smith},
journal= {arXiv preprint arXiv:1809.07776},
year = {2019}
}