Majorana Qubit Readout Using Longitudinal Qubit-Resonator Interaction

TL;DR

This paper introduces a quantum non-demolition readout method for Majorana qubits using a longitudinal interaction modulated by microwave control, enabling high-fidelity measurement and multi-qubit operations.

Contribution

It presents a novel protocol for Majorana qubit readout based on parametric modulation of a longitudinal interaction, leveraging topological properties for exponential accuracy.

Findings

Interaction can be modulated via microwave gate-voltage or flux control.

The readout is quantum non-demolition to exponential accuracy.

Method extends to multi-qubit measurements and long-range entangling gates.

Abstract

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.