Time-Domain Two-Magnon Interference Enabled by a Tunable Beamsplitter

TL;DR

This paper demonstrates a controllable two-magnon interference in the time domain using a tunable magnonic beamsplitter, enabling the creation of entangled magnonic states with potential applications in quantum metrology and computing.

Contribution

It introduces a hybrid cavity magnonic system with a tunable beamsplitter for two-magnon interference, a novel approach in magnonics and quantum information processing.

Findings

Realized a tunable magnonic beamsplitter in a hybrid system.

Generated a maximally entangled magnonic N00N state.

Showed potential for quantum metrological applications.

Abstract

This letter presents a model system for controllable two-magnon interference in the time domain. This two-magnon interference, i.e., a magnonic analog to the photonic Hong-Ou-Mandel effect, is supported by a tunable magnonic beamsplitter operation formed in a hybrid cavity magnonic system comprising a pair of mutually coupled magnon modes. By applying a time-dependent magnetic field, magnons can be excited independently in each mode and subsequently brought into interaction, shifting from independent to collective oscillations, to realize a controllable magnonic beamsplitter. When the beamsplitter operation is applied to an initially unentangled two-magnon state, a maximally entangled magnonic $N00N$ state with tunable phase sensitivity is produced. These findings suggest that two-magnon interference in hybrid cavity magnonic systems may enable novel quantum metrological devices to study fundamental magnon dynamics and contribute to developing hybrid magnonic quantum computing architectures.