Quantum interference induced magnon blockade and antibunching in a hybrid quantum system

TL;DR

This paper investigates quantum interference effects in a hybrid ferromagnet-superconductor system, demonstrating magnon blockade and antibunching phenomena that can be tuned for potential single magnon source applications.

Contribution

It introduces a scheme for magnon blockade via quantum interference in a hybrid system, highlighting control mechanisms for antibunching through coupling and detuning adjustments.

Findings

Magnon antibunching can be achieved and tuned in the system.

Destructive interference restricts simultaneous magnon excitations.

The scheme is promising for single magnon device development.

Abstract

In this work, we study the phenomena of quantum interference assisted magnon blockade and magnon antibunching in a weakly interacting hybrid ferromagnet-superconductor system. The magnon excitations in two yttrium iron garnet spheres are indirectly coupled to a superconducting qubit through microwave cavity modes of two mutually perpendicular cavities. We find that when one of the magnon mode is driven by a weak optical field, the destructive interference between more than two distinct transition pathways restricts simultaneous excitation of two magnons. We analyze the magnon correlations in the driven magnon mode for the case of zero detunings as well as finite detunings of the magnon modes and the qubit. We show that the magnon antibunching can be tuned by changing the magnon-qubit coupling strength ratio and the driving detuning. Our work proposes a possible scheme which have significant role in the construction of single magnon generating devices.