Low cross-talk optical addressing of trapped-ion qubits using a novel integrated photonic chip.

Autor: Sotirova AS; University of Oxford, Department of Physics, Oxford, OX1 3PU, UK. ana.sotirova@physics.ox.ac.uk., Sun B; University of Oxford, Department of Engineering Science, Oxford, OX1 3PJ, UK. b.s.shawnsuen@gmail.com., Leppard JD; University of Oxford, Department of Physics, Oxford, OX1 3PU, UK., Wang A; University of Oxford, Department of Engineering Science, Oxford, OX1 3PJ, UK., Wang M; University of Oxford, Department of Engineering Science, Oxford, OX1 3PJ, UK., Vazquez-Brennan A; University of Oxford, Department of Physics, Oxford, OX1 3PU, UK., Nadlinger DP; University of Oxford, Department of Physics, Oxford, OX1 3PU, UK., Moser S; Institute of Biomedical Physics, Medical University of Innsbruck, Müllerstraße 44, 6020, Innsbruck, Austria., Jesacher A; Institute of Biomedical Physics, Medical University of Innsbruck, Müllerstraße 44, 6020, Innsbruck, Austria., He C; University of Oxford, Department of Engineering Science, Oxford, OX1 3PJ, UK., Pokorny F; University of Oxford, Department of Physics, Oxford, OX1 3PU, UK., Booth MJ; University of Oxford, Department of Engineering Science, Oxford, OX1 3PJ, UK. martin.booth@eng.ox.ac.uk., Ballance CJ; University of Oxford, Department of Physics, Oxford, OX1 3PU, UK. chris.ballance@physics.ox.ac.uk.
Jazyk: angličtina
Zdroj: Light, science & applications [Light Sci Appl] 2024 Aug 20; Vol. 13 (1), pp. 199. Date of Electronic Publication: 2024 Aug 20.
DOI: 10.1038/s41377-024-01542-x
Abstrakt: Individual optical addressing in chains of trapped atomic ions requires the generation of many small, closely spaced beams with low cross-talk. Furthermore, implementing parallel operations necessitates phase, frequency, and amplitude control of each individual beam. Here, we present a scalable method for achieving all of these capabilities using a high-performance integrated photonic chip coupled to a network of optical fibre components. The chip design results in very low cross-talk between neighbouring channels even at the micrometre-scale spacing by implementing a very high refractive index contrast between the channel core and cladding. Furthermore, the photonic chip manufacturing procedure is highly flexible, allowing for the creation of devices with an arbitrary number of channels as well as non-uniform channel spacing at the chip output. We present the system used to integrate the chip within our ion trap apparatus and characterise the performance of the full individual addressing setup using a single trapped ion as a light-field sensor. Our measurements showed intensity cross-talk below ~10 -3 across the chip, with minimum observed cross-talk as low as ~10 -5 .
(© 2024. The Author(s).)
Databáze: MEDLINE
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