Efficient spectrum analysis for multi-junction nonlinear superconducting circuit

  1. A. Tomonaga,
  2. H. Mukai,
  3. K. Mizuno,
  4. and J. S. Tsai
The extraction of transition frequencies from a spectrum has conventionally relied on empirical methods, and particularly in complex systems it is a time-consuming and cumbersome process.

Fast generation of Schrödinger cat states in a Kerr-tunable superconducting resonator

  1. X.L. He,
  2. Yong Lu,
  3. D.Q. Bao,
  4. Hang Xue,
  5. W.B. Jiang,
  6. Zhen Wang,
  7. A.F. Roudsari,
  8. Per Delsing,
  9. J. S. Tsai,
  10. and Z. R. Lin
Schrödinger cat states, quantum superpositions of macroscopically distinct classical states, are an important resource for quantum communication, quantum metrology and quantum computation.

Ultrastrong tunable coupler between superconducting LC resonators

  1. T. Miyanaga,
  2. A. Tomonaga,
  3. H. Ito,
  4. H. Mukai,
  5. and J. S. Tsai
We investigate the ultrastrong tunable coupler for coupling of superconducting resonators. Obtained coupling constant exceeds 1 GHz, and the wide range tunability is achieved both antiferromagnetics

Photon-Dressed Bloch-Siegert Shift in an Ultrastrongly Coupled Circuit Quantum Electrodynamical System

  1. Shuai-Peng Wang,
  2. Guo-Qiang Zhang,
  3. Yimin Wang,
  4. Zhen Chen,
  5. Tiefu Li,
  6. J. S. Tsai,
  7. Shi-Yao Zhu,
  8. and J. Q. You
A cavity quantum electrodynamical (QED) system beyond the strong-coupling regime is expected to exhibit intriguing quantum phenomena. Here we report a direct measurement of the photon-dressed

Tunable Microwave Single-photon Source Based on Transmon Qubit with High Efficiency

  1. Yu Zhou,
  2. Zhihui Peng,
  3. Yuta Horiuchi,
  4. O. V. Astafiev,
  5. and J. S. Tsai
Single-photon sources are of great interest because they are key elements in different promising applications of quantum technologies. Here we demonstrate a highly efficient tunable

Pseudo-2D superconducting quantum computing circuit for the surface code

  1. H. Mukai,
  2. K. Sakata,
  3. S.J. Devitt,
  4. R. Wang,
  5. Y. Zhou,
  6. Y. Nakajima,
  7. and J. S. Tsai
Of the many potential hardware platforms, superconducting quantum circuits have become the leading contender for constructing a scalable quantum computing system. All current architecture

Hybrid rf SQUID qubit based on high kinetic inductance

  1. J.T. Peltonen,
  2. P. C. J. J. Coumou,
  3. Z.H. Peng,
  4. T. M. Klapwijk,
  5. J. S. Tsai,
  6. and O. V. Astafiev
We report development and microwave characterization of rf SQUID (Superconducting QUantum Interference Device) qubits, consisting of an aluminium-based Josephson junction embedded in

Vacuum induced Aulter-Townes splitting in a superconducting artificial atom

  1. Z.H. Peng,
  2. J.H. Ding,
  3. Y. Zhou,
  4. L.L. Ying,
  5. Z. Wang,
  6. L. Zhou,
  7. L.M. Kuang,
  8. Yu-xi Liu,
  9. O. Astfiev,
  10. and J. S. Tsai
We study experimentally a vacuum induced Aulter-Townes doublet in a superconducting three-level artificial atom strongly coupled to a coplanar waveguide resonator and simultaneously

Method for identifying electromagnetically induced transparency in a tunable circuit quantum electrodynamics system

  1. Qi-Chun Liu,
  2. Tie-Fu Li,
  3. Xiao-Qing Luo,
  4. Hu Zhao,
  5. Wei Xiong,
  6. Ying-Shan Zhang,
  7. Zhen Chen,
  8. J. S. Liu,
  9. Wei Chen,
  10. Franco Nori,
  11. J. S. Tsai,
  12. and J. Q. You
Electromagnetically induced transparency (EIT) has been realized in atomic systems, but fulfilling the EIT conditions for artificial atoms made from superconducting circuits is a more

Multi-photon sideband transitions in an ultrastrongly-coupled circuit quantum electrodynamics system

  1. Zhen Chen,
  2. Yimin Wang,
  3. Tiefu Li,
  4. Lin Tian,
  5. Yueyin Qiu,
  6. Kunihiro Inomata,
  7. Fumiki Yoshihara,
  8. Siyuan Han,
  9. Franco Nori,
  10. J. S. Tsai,
  11. and J. Q. You
Ultrastrong coupling in circuit quantum electrodynamics systems not only provides a platform to study the quantum Rabi model, but it can also facilitate the implementation of quantum