  The Quantum Scientific Computing Open User Testbed (QSCOUT) is a trapped-ion
quantum computer testbed realized at Sandia National Laboratories on behalf of
the Department of Energy's Office of Science and its Advanced Scientific
Computing (ASCR) program. Here we describe Jaqal, for Just another quantum
assembly language, the programming language we invented to specify programs
executed on QSCOUT. Jaqal is useful beyond QSCOUT---it can support mutliple
hardware targets because it offloads gate names and their pulse-sequence
definitions to external files. We describe the capabilities of the Jaqal
language, our approach in designing it, and the reasons for its creation. To
learn more about QSCOUT, Jaqal, or JaqalPaq, the metaprogramming Python package
we developed for Jaqal, please visit https://qscout.sandia.gov,
https://gitlab.com/jaqal, or send an e-mail to<EMAIL_ADDRESS>