在超導電路發展以電磁誘發透明現象為基礎的單光子偵測器及量子記憶體(2/3)

Josephson-junction-based superconducting artificial atoms can strongly interact with itinerant photons propagating in the one-dimension open transmission line and form the waveguide quantum electrodynamics (WQED) architecture. In addition to the circuit quantum electrodynamics (CQED) architecture proposed to realize quantum computing, the single atom in WQED architecture is proposed to serve as a node in quantum network to deal with quantum information. In superconducting circuits, the toolbox for quantum information processing is less complete than that in AMO. To expand the toolbox, we devote to developing the single-photon detector and quantum memory based on electromagnetically induced transparency (EIT). An EIT system enjoys the trapped light phenomenon, and is therefore capable of storing information carried by photons. The main obstacle for realizing EIT in superconducting circuits comes from that superconducting artificial atoms typically do not favor Λ-type dipole-allowed transition level structure. In this proposal, we will continue on the works of developing Λ-type superconducting artificial atoms to achieve EIT, currently funded by MOST. We concentrate on two applications: a single photon detector via our recent strongly-coupled-qubit-pairs based EIT design, and a quantum memory via a bad-qubit-limit design with information stored inside a high-quality resonator. The advance in EIT applications will foster quantum information processing in superconducting circuits.