Readout method for Kitaev chain qubit devices

Qubits encoded in the parity of pairs of Majorana zero modes are believed to offer a promising platform towards fault-tolerant quantum computing. Recently, the single-shot readout of a pair of Majorana zero modes has been demonstrated in a minimal Kitaev chain [1]. Here, we integrate the same readout technique into a qubit architecture consisting of two Kitaev chains. Utilizing time-domain measurements, we demonstrate the ability to distinguish the different qubit states and to detect leakage out of the computational subspace. 

 

 

1. van Loo, N., Zatelli, F., Steffensen, G. O., Roovers, B., Wang, G., Van Caekenberghe, T., ... & Kouwenhoven, L. P. (2025). Single-shot parity readout of a minimal Kitaev chain. arXiv preprint arXiv:2507.01606