My research group experimentally studies controllable solid-state quantum systems in order to answer fundamental questions about how nature behaves, and to investigate technological applications of quantum physics such as quantum computing, quantum simulation, and quantum networks. To accomplish this, his group designs and fabricates chips in which it is possible to control and measure nature at the level of individual particles, such as electrons (which possess charge and spin) and photons. His group performs experiments on these chips under extreme conditions where quantum effects dominate, including at ultra-low temperatures and at high magnetic fields. His group also builds circuits on the chips that force the particles to interact with each other, generating entangled many-body quantum states, an operation essential for quantum technologies, and where the most unusual effects in quantum mechanics occur.