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Description
Single ion addressing provides a critical computational advantage for trapped-ion registers used for large-scale quantum simulation and computation [1][2]. Several schemes are currently used including arrays of mechanically positioned micro-optic fibers [3], holographic diffraction patterns produced by arrays of micromirrors [4], and beam splitting by AODs driven by multi-tone rf frequencies [5]. The last technique offers simplicity of experimental setup and electronic control of beam position via arbitrary injection of rf tones applied to the AODs.
Presented here is a system for single-ion addressing by multi-tone RF driven AODs with a single high-intensity 411 nm beam delivered through a high NA lens on 171Yb+ ions. This scheme offers the ability to arbitrarily select ions in a large quantum register to exhibit an AC Stark shift on the hyperfine energy splitting of the electronic ground state, providing reliable isolation from global interactions [6]. Further, this system enables single-qubit-addressable high-fidelity readout via electron shelving in the 2D5/2 and 2F7/2 electronic states [7].
References
[1] Hempel, Cornelius. Digital quantum simulation, Schrödinger cat state spectroscopy and setting up a linear ion trap. Diss. 2014.
[2] NAÈgerl, H. Ch, et al. "Laser addressing of individual ions in a linear ion trap." Physical Review A 60.1 (1999): 145.
[3] Crain, S., et al. "Individual addressing of trapped 171Yb+ ion qubits using a microelectromechanical systems-based beam steering system." Applied Physics Letters 105.18 (2014): 181115.
[4] Shih, CY., Motlakunta, S., Kotibhaskar, N. et al. Reprogrammable and high-precision holographic optical addressing of trapped ions for scalable quantum control. npj Quantum Inf 7, 57 (2021)
[5] Pogorelov, Ivan, et al. "Compact ion-trap quantum computing demonstrator." PRX Quantum 2.2 (2021): 020343.
[6] Pernthaler, Lukas Falko. Single Ion Addressing of up to 50 Ions. Diss. University of Innsbruck, 2019.
[7] Edmunds, C. L., et al. "Scalable hyperfine qubit state detection via electron shelving in the 2 D 5/2 and 2 F 7/2 manifolds in 171 Yb+." Physical Review A 104.1 (2021): 012606.
