Chiral Transfer and Preparation of Mechanical Bell States

Abstract

Generating maximally entangled Bell states is a long‐standing goal for practical quantum information processing. Mechanical resonators, as macroscopic bosonic modes with long coherence times and rich nonlinear resources, have recently been endowed with a powerful squeezing resource: two‐phonon drive can be leveraged to deterministically encode qubits in the lowest squeezed–Fock states. Here, we show that this squeezed–Fock encoding not only defines a robust qubit subspace, but also provides an inherently tunable platform for generating Bell states. In this work, we propose a system of two coupled mechanical resonators. By simply modulating the squeezing parameter, the effective detuning and dissipation of a mechanical qubit can be simultaneously and precisely controlled, allowing the coupled system to dynamically evolve near exceptional points in parameter space. In post‐selection protocol, we demonstrate that this enables chiral transfer between Bell states, as well as the preparation of Bell states from separable initial states, both achieving a conditional fidelity of 0.99 with no‐jump success probability of . Our work establishes mechanical squeezed–Fock qubits as a promising platform for exceptional‐point‐based quantum control, and opens a path toward on‐chip generation and chiral manipulation of macroscopic entanglement.