Dispersive optical systems for scalable Raman driving of hyperfine qubits

• URL: http://arxiv.org/abs/2110.14645v1
• Date: Wed, 27 Oct 2021 18:00:00 GMT
• Title: Dispersive optical systems for scalable Raman driving of hyperfine qubits
• Authors: Harry Levine, Dolev Bluvstein, Alexander Keesling, Tout T. Wang, Sepehr Ebadi, Giulia Semeghini, Ahmed Omran, Markus Greiner, Vladan Vuleti\'c, and Mikhail D. Lukin
• Abstract summary: We introduce a new method for generating amplitude modulation by phase modulating a laser. This approach is passively stable, offers high efficiency, and is compatible with high-power laser sources. We benchmark this new approach by globally driving an array of $sim 300$ neutral $87$Rb atomic qubits trapped in optical tweezers.
• Score: 45.82374977939355
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Hyperfine atomic states are among the most promising candidates for qubit encoding in quantum information processing. In atomic systems, hyperfine transitions are typically driven through a two-photon Raman process by a laser field which is amplitude modulated at the hyperfine qubit frequency. Here, we introduce a new method for generating amplitude modulation by phase modulating a laser and reflecting it from a highly dispersive optical element known as a chirped Bragg grating (CBG). This approach is passively stable, offers high efficiency, and is compatible with high-power laser sources, enabling large Rabi frequencies and improved quantum coherence. We benchmark this new approach by globally driving an array of $\sim 300$ neutral $^{87}$Rb atomic qubits trapped in optical tweezers, and obtain Rabi frequencies of 2 MHz with photon-scattering error rates of $< 2 \times 10^{-4}$ per $\pi$-pulse. This robust approach can be directly integrated with local addressing optics in both neutral atom and trapped ion systems to facilitate high-fidelity single-qubit operations for quantum information processing.

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