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Bulletin of the American Physical Society

Integrated Technologies for Chip-Scale Trapped-Ion Quantum Control

Robert McConnell, Suraj Bramhavar, Colin Bruzewicz, Dave Kharas, William Loh, Karan K. Mehta, Jason J. Plant, Jonathon A. Sedlacek, Cheryl M. Sorace-Agaskar, Jules Stuart, John Chiaverini, Rajeev J. Ram, Jeremy Sage

Published Jun 6, 2017• 0 citations
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Quantum computers based on trapped ions have approached the point of executing interesting near-term algorithms, but scaling beyond tens of ion qubits will require either increasingly large experiments or integration of control technology. This article presents the design and implementation of a cryogenically compatible dc voltage source incorporated into the substrate beneath the electrodes of an ion trap. An analog switch enables the integrated circuit to reach noise levels similar to those in much larger commercial electronics. These results herald the application of similar designs in future experiments focused on creating scalable or deployable quantum systems.
Recent advances in quantum technologies rely on precise control and integration of quantum objects, and technological breakthroughs are anticipated for further scaling up to realize practical applications. Trapped-ion quantum technology is a promising candidate to realize them, while its scalability depends on the development of intra-node scaling up, reproducibility of quantum nodes, and photonic interconnection among them. Utilization of integrated photonics instead of free-space optics is a crucial step toward mass production of trapped-ion quantum nodes and manifests itself as useful for laser delivery for various quantum operations and photon detection. However, the whole architecture of the scalable photonic circuits for them is left unexplored. In this work, we discuss photonic routing architectures for trapped-ion quantum devices, in which lasers of multiple wavelengths are delivered to multiple trapping zones within a single chip. We analyze two methods of configuring nanophotonic waveguides and compare them in terms of loss of total laser power. This work opens up a new landscape of photonic architecture for trapped-ion quantum technologies, which broadens the scope of integrated photonics for quantum technologies.