2020/09/30 by Thomas B. Smith, Maja C. Cassidy, David J. Reilly +2 · 31 citations
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Coupling (piping) #MAJORANA #Majorana equation #Quantum computer #Quantum optics and atomic interactions #Qubit #Topological Materials and Phenomena #Transmon #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/prxquantum.1.020313
published in PRX Quantum 1(2) (American Physical Society)
openalex created_date 2020/09/08 · openalex publication_date 2020/11/10 · arxiv created 2020/11/11 · arxiv updated 2020/11/12 · openalex updated_date 2026/08/05
We analyze a readout scheme for Majorana qubits based on dispersive coupling to a resonator. We consider two variants of Majorana qubits: the Majorana transmon and the Majorana box qubit. In both cases, the qubit-resonator interaction can produce sizeable dispersive shifts in the megahertz range for reasonable system parameters, allowing for submicrosecond readout with high fidelity. For Majorana transmons, the light-matter interaction used for readout manifestly conserves Majorana parity, which leads to a notion of quantum nondemolition (QND) readout that is stronger than for conventional charge qubits. In contrast, Majorana box qubits only recover an approximately QND readout mechanism in the dispersive limit where the resonator detuning is large. We also compare dispersive readout to longitudinal readout for the Majorana box qubit. We show that the latter gives faster and higher fidelity readout for reasonable parameters, while having the additional advantage of being manifestly QND, and so may prove to be a better readout mechanism for these systems.