Work

Motion-insensitive time-optimal control of optical qubits

Year: 2025

Type: article

Abstract: We derive new, fundamental insights into the dynamics of an optical qubit, revealing how this is influenced by the motion of the trapped particle. Leveraging these new insights, we show that photon-recoil heating can be suppressed at relatively high Rabi frequencies by modulating the phase of the driving laser field in time. This technique enables single-qubit gates that are up to 20 times faster than current state-of-the-art approaches while maintaining the same fidelity. Remarkably, even when photon recoil is eliminated (i.e. when occupation of Fock states is preserved), we find that the gate infidelity does not vanish, but is rather limited by a fundamental mechanism, which we identify as thermal motion-induced entanglement. To overcome this limitation and the effect of recoil, we derive motion-insensitive control pulses that enable the execution of fast, very high-fidelity gates with optical qubits.

Source: Quantum Science and Technology

DOI: 10.1088/2058-9565/add61c

Authors: Léo Van Damme, Zhao Zhang, Amit Devra, Steffen J Glaser, Andrea Alberti

Institutions: Munich Center for Quantum Science and Technology, Technical University of Munich, Max Planck Institute of Quantum Optics, Ludwig-Maximilians-Universität München

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,895

Funders: Deutsche Forschungsgemeinschaft, Bundesministerium für Bildung und Forschung, Munich Center for Quantum Science and Technology