University of Auckland, New Zealand
Recent experiments with superconducting qubits have dramatically changed the landscape for addressing elementary quantum systems - both in the preparation and measurement of quantum states. Even the reconstruction of individual quantum trajectories is now carried out. In this talk, I first introduce the idea of a "quantum trajectory," where I contrast the jump trajectory of photon counting with the diffusive trajectory applicable to superconducting qubits. I then explore two applications, one related to the infamous Schrodinger cat and the other to the Bohr-Schrödinger discussion of quantum jumps from 1926; both, in a modern context, illuminate the meaning of that catchword "decoherence."