Robust control and optimal Rydberg states for neutral atom two-qubit gates

Mohan, Madhav; Keijzer, Robert de; Kokkelmans, Sjjmf Servaas

doi:10.48550/arxiv.2212.10159

Cited by 1 publication

(1 citation statement)

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“…The enhanced performance results from the dynamical phase compensations in the symmetric gate protocols with an optimized laser field detuning [23], which can be further improved by optimizing pulse shapes [26,27,29]. This shows the capability of controllable laser fields with tunable amplitudes and detunings, and the opportunities provided by these optimized laser pulses to achieve an even higher fidelity two-qubit gates [31]. Meanwhile, a practical experimental implementation [25] prefers a scheme with straightforward and tractable operating parameters, which can hugely reduce the complexity and the uncontrollable systematic errors in experiments.…”

Section: Introductionmentioning

confidence: 99%

High-fidelity Rydberg controlled-Z gates with optimized pulses

Chang,

Wang,

Jen

et al. 2023

New J. Phys.

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High-fidelity controlled-Z (CZ ) gates are essential and mandatory to build a large-scale quantum computer. In neutral atoms, the strong dipole–dipole interactions between their Rydberg states make them one of the pioneering platforms to implement CZ gates. Here we numerically investigate the optimized pulses to generate a high-fidelity Rydberg C Z gate in a three-level ladder-type atomic system. By tuning the temporal shapes of Gaussian or segmented pulses, the populations on the intermediate excited states are shown to be suppressed within the symmetric gate operation protocol, which leads to a C Z gate with a high Bell fidelity up to 99.92 % . These optimized pulses are robust to thermal fluctuations and the excitation field variations. Our results promise a high-fidelity and fast gate operation under amenable and controllable experimental parameters, which goes beyond the adiabatic operation regime under a finite blockade strength.

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