Quantum Interactive Dynamics

A confluence of developments across a range of subfields --- particularly experimental advances in building Noisy Intermediate-Scale Quantum (NISQ) devices --- have opened up a vast new territory of studying many-body phenomena in novel regimes: highly excited, "post Hamiltonian", and far from equilibrium. The natural evolutions implemented by these novel experiments are dynamics generated by quantum circuits of unitary gates, possibly interrupted by measurements, and starting from initial states that are not low energy in any useful sense. These platforms present an opportunity to explore vastly larger tracts of Hilbert space that are normally hard to reach. They also present new ways to interrogate a quantum system to probe complex quantum correlations, for instance, via an interactive dialog with a classical experimenter. I will describe novel emergent phenomena in the non-equilibrium entanglement dynamics of interactive quantum circuits.