Dissipation-induced nonreciprocal magnon blockade in a magnon-based hybrid system

Abstract

We propose an experimentally realizable nonreciprocal magnonic device at the single-magnon level by exploiting magnon blockade in a magnon-based hybrid system. The coherent qubit-magnon coupling, mediated by virtual photons in a microwave cavity, leads to the energy-level anharmonicity of the composite modes. In contrast, the corresponding dissipative counterpart, induced by traveling microwaves in a waveguide, yields inhomogeneous broadenings of the energy levels. As a result, the cooperative effects of these two kinds of interactions give rise to the emergence of the directiondependent magnon blockade. We show that this can be demonstrated by studying the equal-time second-order correlation function of the magnon mode. Our study opens an avenue to engineer nonreciprocal magnonic devices in the quantum regime involving only a small number of magnons.

Cyclic quantum state sharing with a nine-qubit entangled state

“…Quantum entanglement plays an essentially central in the ongoing field of quantum information processing [1,2]. It has been applied to different quantum systems, such as magnetic systems [3][4][5], opto-mechanical systems [6][7][8][9], solidstate spins systems [10][11][12][13]. On the other hand, quantum secret sharing (QSS), an important branch of quantum communication, is the quantum counterpart of classical secret sharing.…”