Adaptable Route to Fast Coherent State Transport via Bang-Bang-Bang Protocols

Ya-Tang Yu

Hsin-Lien Lee

Ting HsuGuin-Dar Lin

Ying-Cheng Chen

H. H. Jen

Date of Publication

June 8, 2026

Centers

Trapped-Ion Quantum Computing Laboratory

Publication Information

Phys. Rev. Lett. 136, 230802

Table of Contents

Fast coherent state transport is essential to quantum computation and quantum information processing. While an adiabatic transport of atomic qubits guarantees a high fidelity of the state preparation, it requires a long timescale that defies efficient quantum operations. Here, we propose an adaptable and fast bang-bang-bang protocol, utilizing a combination of forward- and backward-moving trap potentials, to expedite the coherent state transport. We further showcase the advantage of applying squeezed coherent state evolution under a deeper potential followed by a weaker one, where a design of symmetric squeezing potential transports promotes an even shorter timescale for genuine state preparation. Our protocols outperform conventional forward-moving-only methods, providing new insights and opportunities for rapid state transport and preparation, ultimately advancing the capabilities of quantum control and quantum operations.