The wave-particle nature of light has been debated since the time of Newton. Quantum mechanics has been remarkably successful in resolving light's seemingly conflicting behaviour. More surprisingly perhaps is that this quantum theory of light extends to macroscopic variables such as voltages and currents within wires, as verified by experiments in the 1980's. In the past few years we have gained unprecedented control over the individual microwave photons in circuits using a technique known as circuit quantum electrodynamics. I will describe our experiments, which can produce individual microwave photons (Fock states) within a circuit, and further how these photons can be detected without absorbing them (a quantum non-demolition measurement). I will also talk about perspectives of what we can do with quantum circuits moving forward.

Argonne Physics Division Colloquium Schedule