Publications

Results 26–50 of 80

Search results

Jump to search filters

In situ detection of RF breakdown on microfabricated surface ion traps

Journal of Applied Physics

Wilson, Joshua M.; Tilles, Julia N.; Haltli, Raymond A.; Ou, Eric; Blain, Matthew G.; Clark, Susan M.; Revelle, Melissa R.

We report microfabricated surface ion traps are a principal component of many ion-based quantum information science platforms. The operational parameters of these devices are pushed to the edge of their physical capabilities as the experiments strive for increasing performance. When the applied radio-frequency (RF) voltage is increased excessively, the devices can experience damaging electric discharge events known as RF breakdown. We introduce two novel techniques for in situ detection of RF breakdown, which we implemented while characterizing the breakdown threshold of surface ion traps produced at Sandia National Laboratories. In these traps, breakdown did not always occur immediately after increasing the RF voltage, but often minutes or even hours later. This result is surprising in the context of the suggested mechanisms for RF breakdown in vacuum. Additionally, the extent of visible damage caused by breakdown events increased with the applied voltage. To minimize the probability for damage when RF power is first applied to a device, our results strongly suggest that the voltage should be ramped up over the course of several hours and monitored for breakdown.

More Details
TYPE Journal Article YEAR 2022
DOIOSTI

Batching Circuits to Reduce Compilation in Quantum Control Hardware

Proceedings - 2022 IEEE International Conference on Quantum Computing and Engineering, QCE 2022

Grinevich, Ashlyn D.; Lobser, Daniel L.; Yale, Christopher G.; Van Der Wall, Jay W.; Maupin, Oliver G.; Goldberg, Joshua D.; Chow, Matthew N.; Revelle, Melissa R.; Clark, Susan M.

At Sandia National Laboratories, QSCOUT (the Quantum Scientific Computing Open User Testbed) is an ion-trap based quantum computer built for the purpose of allowing users low-level access to quantum hardware. Commands are executed on the hardware using Jaqal (Just Another Quantum Assembly Language), a programming language designed in-house to support the unique capabilities of QSCOUT. In this work, we describe a batching implementation of our custom software that speeds the experimental run-time through the reduction of communication and upload times. Reducing the code upload time during experimental runs improves system performance by mitigating the effects of drift. We demonstrate this implementation through a set of quantum chemistry experiments using a variational quantum eigensolver (VQE). While developed specifically for this testbed, this idea finds application across many similar experimental platforms that seek greater hardware control or reduced overhead.

More Details
TYPE Conference Paper YEAR 2022
OSTIScopus

JAQAL Exemplars Highlight Slide

Clark, Susan M.

Simulated previous quantum chemistry experiments using JAQAL (Just Another Quantum Assembly Language), matching expected results. Lays the groundwork for QSCOUT (Quantum Scientific Computing Open User Testbed) users to conduct their own quantum experiments, and tests the capabilities of the JAQAL language.

More Details
TYPE Other Report YEAR 2021
DOIOSTI
Results 26–50 of 80
Results 26–50 of 80