Dr. Emily Mount Profile

Dr. Emily Mount

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Proceedings Article | 24 February 2012 Paper

UV laser beam switching system for Yb trapped ion quantum information processing

David Scherer, Joel Hensley, Krishnan Parameswaran, Douglas Bamford, Emily Mount, Stephen Crain, Jungsang Kim

Proceedings Volume 8272, 827219 (2012) https://doi.org/10.1117/12.906780

KEYWORDS: Microelectromechanical systems, Ions, Ultraviolet radiation, Mirrors, Crystals, Switching, Switches, Quantum communications, Quantum computing, Computing systems

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Qubits based on trapped ions are being investigated as a promising platform for scalable quantum information processing. One challenge associated with the scalability of such a multi-qubit trapped ion system is the need for an ultraviolet (UV) laser beam switching and control system to independently modulate and address large qubit arrays. In this work, we propose and experimentally demonstrate a novel architecture for a laser beam control system for trapped ion quantum computing based on fast electro-optic amplitude switching and high-fidelity electromechanical beam shuttering using a microelectromechanical systems (MEMS) deflector coupled into a single-mode optical fiber. We achieve a rise/fall time of 5 ns, power extinction of -31 dB, and pulse width repeatability of > 99.95% using an electrooptic switch based on a β-BaB₂O₄ (BBO) Pockels cell. A tilting MEMS mirror fabricated using a commercial foundry was used to steer UV light into a single-mode optical fiber, resulting in an electromechanical beam shutter that demonstrated a power extinction of -52 dB and a switching time of 2 μs. The combination of these two technologies allows for high-fidelity power extinction using a platform that does not suffer from temperature-induced beam steering due to changes in modulation duty cycle. The overall system is capable of UV laser beam switching to create the resolved sideband Raman cooling pulses, algorithm pulses, and read-out pulses required for quantum computing applications.

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