Coherent coupling and non-destructive measurement of trapped-ion mechanical oscillators

Published

July 29, 2024

Author(s)

Panyu Hou, Jenny Wu, Stephen Erickson, Daniel Cole, Giorgio Zarantonello, Adam Brandt, Andrew C. Wilson, Daniel Slichter, Dietrich Leibfried

Abstract

Precise quantum control and measurement of several harmonic oscillators, such as the modes of the electromagnetic field in a cavity or of mechanical motion, are key for their use as quantum platforms. The motional modes of trapped ions can be individually controlled and have good coherence properties. However, achieving high-fidelity two-mode operations and non-destructive measurements of the motional state has been challenging. Here we demonstrate the coherent exchange of single motional quanta between spectrally separated harmonic motional modes of a trapped-ion crystal. The timing, strength, and phase of the coupling are controlled through an oscillating electric potential with suitable spatial variation. Coupling rates that are much larger than decoherence rates enable demonstrations of high-fidelity quantum state transfer and beam-splitter operations, entanglement of motional modes, and Hong–Ou–Mandel-type interference. Additionally, we use the motional coupling to enable repeated non-destructive projective measurement of a trapped-ion motional state. Our work enhances the suitability of trapped-ion motion for continuous-variable quantum computing and error correction and may provide opportunities to improve the performance of motional cooling and motion-mediated entangling interactions.

Citation

Nature Physics

Volume

20

Pub Type

Journals

Download Paper

https://doi.org/10.1038/s41567-024-02585-y

Local Download

Keywords

Coupled quantum harmonic oscillators, trapped ions, quantum information processing, bosonic error correction

Citation

Hou, P. , Wu, J. , Erickson, S. , Cole, D. , Zarantonello, G. , Brandt, A. , Wilson, A. , Slichter, D. and Leibfried, D. (2024), Coherent coupling and non-destructive measurement of trapped-ion mechanical oscillators, Nature Physics, [online], https://doi.org/10.1038/s41567-024-02585-y, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=934566 (Accessed April 24, 2025)