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Physics

Neutral-Atom Quantum Computers Are Back in the Race

Anonymous

Published Oct 22, 2019• 0 citations
Publisher
DOI
10.1103/physics.12.s120

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Ultracold neutral atoms have emerged as a leading platform for scalable quantum simulation, but can they be similarly used for gate-based quantum computation? In this talk, I will present an overview of major accomplishments in academia that have spurred multiple different startups to enter the quantum computing race, focusing on the use of neutral atoms as a scalable qubit platform. With these proof of principle demonstrations in mind, I will describe Atom Computing's first prototype system and recently announced use of a unique qubit to achieve bare coherence times in excess of 20 seconds. Utilizing qubit states that are broadly insensitive to the environment they are trapped in, this system is quickly becoming a testbed for how to build programmatic control into neutral atom systems that rivals other leading quantum computing platforms.

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Neutral atom quantum computers (NAQCs) are among the most promising computational platforms for quantum computing. Controlling and measuring individual atoms and their states, which often requires multiple imaging and image-analysis procedures, is typically the most time-consuming task during computation and contributes significantly to overall cycle times. To resolve this challenge, we propose a highly-parallel atom-detection accelerator for tweezer-based NAQCs. Our design builds on an existing state-reconstruction method and combines an algorithm-level optimization with a Field Programmable Gate Array (FPGA) implementation to maximize parallelism and reduce the run time of the image-analysis process. We identify and overcome several challenges for an FPGA implementation, such as introducing a prefetching mechanism to improve scalability and customizing bus transfers to support large bandwidths. Tested on a Xilinx UltraScale+ FPGA, our design can analyze a 256x256-pixel fluorescence image in just 115mus, achieving 34.9x and 6.3x speedups over the original and optimized CPU baseline, respectively. Moreover, our accelerator can maintain consistent resource utilization across various atom array sizes, contributing to the ongoing efforts toward scalable and fully integrated FPGA-based control systems for NAQCs.
Ultracold neutral atoms have emerged as a leading platform for scalable quantum simulation, but can they be similarly used for gate-based quantum computation? In this talk, I will present an overview of major accomplishments in academia that have spurred multiple different startups to enter the quantum computing race, focusing on the use of neutral atoms as a scalable qubit platform. With these proof of principle demonstrations in mind, I will describe Atom Computing's first prototype system and recently announced use of a unique qubit to achieve bare coherence times in excess of 20 seconds. Utilizing qubit states that are broadly insensitive to the environment they are trapped in, this system is quickly becoming a testbed for how to build programmatic control into neutral atom systems that rivals other leading quantum computing platforms.