  Rapid ongoing progress in quantum information science makes this an apt time
for a Solvay Conference focused on The Physics of Quantum Information. Here I
review four intertwined themes encompassed by this topic: Quantum computer
science, quantum hardware, quantum matter, and quantum gravity. Though the time
scale for broad practical impact of quantum computation is still uncertain, in
the near future we can expect noteworthy progress toward scalable
fault-tolerant quantum computing, and discoveries enabled by programmable
quantum simulators. In the longer term, controlling highly complex quantum
matter will open the door to profound scientific advances and powerful new
technologies.

Quantum Physics;Strongly Correlated Electrons;High Energy Physics - Theory