Wen-Te Liao

Highly efficient microwave memory using a superconducting artificial chiral atom

  1. Kai-I Chu,
  2. Yung-Fu Chen,
  3. and Wen-Te Liao
A microwave memory using a superconducting artificial chiral atom embedded in a one-dimensional open transmission line is theoretically investigated. By applying a coupling field to
a single artificial atom, we modify its dispersion, resulting in a slow probe pulse similar to electromagnetically induced transparency. The single atom’s intrinsic chirality, along with optimal control of the coupling field, enables a storage efficiency exceeding 99% and near-unity fidelity across a broad range of pulse durations. Our scheme provides a feasible pathway toward highly efficient quantum information processing in superconducting circuits.
arxiv pdf

Slow and Stored Light via Electromagnetically Induced Transparency Using A Λ-type Superconducting Artificial Atom

  1. Kai-I Chu,
  2. Xiao-Cheng Lu,
  3. Kuan-Hsun Chiang,
  4. Yen-Hsiang Lin,
  5. Chii-Dong Chen,
  6. Ite A. Yu,
  7. Wen-Te Liao,
  8. and Yung-Fu Chen
Recent progresses in Josephson-junction-based superconducting circuits have propelled quantum information processing forward. However, the lack of a metastable state in most superconducting
artificial atoms hinders the development of photonic quantum memory in this platform. Here, we use a single superconducting qubit-resonator system to realize a desired Λ-type artificial atom, and to demonstrate slow light with a group velocity of 3.6 km/s and the microwave storage with a memory time extending to several hundred nanoseconds via electromagnetically induced transparency. Our results highlight the potential of achieving microwave quantum memory, promising substantial advancements in quantum information processing within superconducting circuits.
arxiv pdf