Temporal magnon-qubit Mach-Zehnder interferometer

TL;DR

This paper proposes a novel temporal magnon-qubit Mach-Zehnder interferometer that uses pulsed magnetic fields to entangle microwave qubits with magnonic states, enabling the study of magnon decoherence at the quantum level.

Contribution

It introduces a new interferometric scheme utilizing pulsed magnetic fields as a magnon-qubit beam splitter for quantum state analysis.

Findings

Allows independent measurement of two magnon decoherence rates

Enables study of single magnon decoherence mechanisms

Provides a platform for quantum magnonic applications

Abstract

A temporal magnon-qubit Mach-Zehnder (MZ) interferometer is proposed. The interferometer is based on controllable entanglement of a microwave qubit and a magnonic state, achieved by application of a pulsed magnetic field playing the role of a magnon-qubit temporal "beam splitter". Analogous to a typical MZ interferometer, the generated interference pattern of the final qubit population carries information about the magnon dynamics. One important application of the proposed scheme is the study of single magnon decoherence. Interestingly, this scheme allows one to independently determine rates of two possible decoherence channels. This may help enable single magnon state applications and answer fundamental questions of quasi-particle decoherence at single quantum levels.