Nonlinear manipulation of tunable microwave amplification and attenuation in superconducting circuits
1 College of Science, China Three Gorges University - Yichang 443002, PRC
2 School of Physics, Huazhong University of Science and Technology - Wuhan 430074, PRC
Received: 17 August 2016
Accepted: 14 September 2016
We demonstrate the controllable nonlinear microwave modulation in a cyclically driven three-level superconducting Josephson system. By designing two subtle matched conditions in the △-type atom-field configuration, a new physical mechanism – combined action of nonlinear wave mixing and wave interference – is developed and leads to not only amplification but also attenuation for two microwave signals. Our results show that such a nonlinear manipulation of the signal transition from enhancement to damping can be tuned in a large scope by controlling the relative phase and the driving-field frequency and thus the solid-state Josephson system can act as a phase- and frequency-controlled amplitude modulator. Our study opens up a fascinating perspective for its widespread applications in nonlinear optics and quantum information science.
PACS: 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption / 42.25.Hz – Interference / 85.25.-j – Superconducting devices
© EPLA, 2016