Entangling a series of trapped ions by moving cavity bus

TL;DR

This paper proposes a method to entangle multiple trapped ions using a moving optical cavity, enabling deterministic generation of multi-ion entangled states with precise control over interactions.

Contribution

It introduces a novel cavity bus approach for entangling ions by moving a cavity to sequentially interact with each ion, allowing deterministic multi-ion entanglement.

Findings

Deterministic generation of 10-ion W state.

Precise control of ion-cavity interaction strengths and durations.

Feasibility analysis supports experimental implementation.

Abstract

Entangling multiple qubits is one of the central tasks for quantum information processings. Here, we propose an approach to entangle a number of cold ions (individually trapped in a string of microtraps) by a moved cavity. The cavity is pushed to include the ions one by one with an uniform velocity, and thus the information stored in former ions could be transferred to the latter ones by such a moving cavity bus. Since the positions of the trapped ions are precisely located, the strengths and durations of the ion-cavity interactions can be exactly controlled. As a consequence, by properly setting the relevant parameters typical multi-ion entangled states, e.g., $W$ state for 10 ions, could be deterministically generated. The feasibility of the proposal is also discussed.