Entanglement control of superconducting qubits and photons

Entanglement is a key resource for novel quantum technologies, especially quantum computing. Different
physical systems have their own merits and challenges, which need to be considered when creating and
manipulating entanglement. For example, superconducting qubits can be easily connected to cavities in the
form of planar waveguides and to each other via these cavity modes. On the other hand, one of their most
notorious challenges is their dense spectrum (‘spectral crowding’). Photonic qubits naturally do not interact
with each other, and are thus long lived, but by the same token it is difficult to create entanglement between
them, especially in a deterministic way. In this talk I will present our  theoretical  work addressing these
challenges: for superconducting qubits, we have developed a technique for fast entangling gates by Speeding
up Waveforms by Inducing Phases to Harmful Transitions (SWIPHT gates). For photons, we use solid-state
emitters  (quantum  dots,  defect  centers  in  solids)  to  create  deterministically  entangled  photonic  “cluster
states”, the necessary resource in measurement-based quantum computing.