## Lattice Quantum Chromodynamics

Lattice Quantum Chromodynamics (Lattice QCD) simulates
the interaction between quarks and gluons using Monte Carlo
methods based on the theory of Quantum Chromodynamics.
Lattice QCD has been successfully applied to study the QCD
phase transition, CP violation, hadron structure and various
other important topics in theoretical nuclear and high
energy physics.

Lattice QCD calculations have been performed on the
world’s fastest supercomputers, from the in-house QCDSP and
QCDOC supercomputers at BNL, to Mira – the BlueGene/Q
supercomputer at Argonne National Laboratory. With the
growing computing power, the amount of data Lattice QCD
generates is also exploding.

Some of these data can be recycled for new calculations
when new ideas come along and can be shared with researchers
without access to a large amount of computing power to speed
up their calculations. However, data storage and retrieval
have been difficult, since the amount of reusable data
generated is quickly approaching the petabyte scale.

The goal for Lattice QCD in the Center for Data-Driven
Discovery is to archive these intermediate data, including
the gluon field configurations, the quark propagators and
the Dirac eigenvectors, and have an efficient retrieval
mechanism so that these costly data can be easily shared
with the community.