Adrian Lupascu: Quantum superconducting circuits

Monday, October 18, 2010 12:30 pm - 1:30 pm EDT (GMT -04:00)

Adrian Lupascu, Institute for Quantum Computing

Quantum superconducting circuits are nanostructured superconducting electrical networks with Josephson junctions. At low temperatures, their quantum dynamics is properly described by using a few degrees of freedom with a collective character. The parameters in the Hamiltonian depend on the dimensions and topology of the circuit; superconducting quantum circuits therefore behave as artificial atoms.

Superconducting quantum circuits have potential applications in quantum information processing and provide a testbed for the study of light-matter interaction in a new regime of ultra-strong interactions.

The main focus of our research is quantum computing with flux-type superconducting quantum bits. I will discuss a new type of quantum gate applicable to two flux qubits which requires a minimum amount of resources. I will present as well a circuit for quantum non-demolition detection of microwave photons.