Spinor matterwave control with nanosecond spin-dependent kicks

• URL: http://arxiv.org/abs/2202.09709v4
• Date: Fri, 26 May 2023 08:09:57 GMT
• Title: Spinor matterwave control with nanosecond spin-dependent kicks
• Authors: Liyang Qiu, Lingjing Ji, Jiangyong Hu, Yizun He, Yuzhuo Wang, Saijun Wu
• Abstract summary: Quantum technology relies on rapid control of atomic matterwaves with hyperfine Raman transitions. These transitions are accompanied by uncompensated dynamic phases and coherent spin-leakages. We program an adiabatic pulse sequence to overcome these limitations.
• Score: 0.8155575318208631
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Significant aspects of advanced quantum technology today rely on rapid control of atomic matterwaves with hyperfine Raman transitions. Unfortunately, efficient Raman excitations are usually accompanied by uncompensated dynamic phases and coherent spin-leakages, preventing accurate and repetitive transfer of recoil momentum to large samples. We provide systematic study to demonstrate that the limitations can be substantially overcame by dynamically programming an adiabatic pulse sequence. Experimentally, counter-propagating frequency-chirped pulses are programmed on an optical delay line to parallelly drive five $\Delta m=0$ hyperfine Raman transitions of $^{85}$Rb atoms for spin-dependent kick (SDK) within $\tau=40$~nanoseconds, with an $f_{\rm SDK}\approx 97.6\%$ inferred fidelity. Aided by numerical modeling, we demonstrate that by alternating the chirps of successive pulses in a balanced fashion, accumulation of non-adiabatic errors including the spin-leakages can be managed, while the dynamic phases can be robustly cancelled. Operating on a phase-stable delay line, the method supports precise, fast, and flexible control of spinor matterwave with efficient Raman excitations.

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