Nonlinear circuit quantum electrodynamics based on the charge-qubit–resonator interface

• Main Authors: Yu, Deshui, Kwek, Leong Chuan, Amico, Luigi, Dumke, Rainer
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2019
• Subjects: Charge-Qubit–Resonator Interface; Nonlinear Circuit; DRNTU::Science::Physics
• Online Access: https://hdl.handle.net/10356/105118; http://hdl.handle.net/10220/47401
• Institution: Nanyang Technological University

We theoretically explore the applications of a nonlinear circuit QED system, where a charge qubit is inductively coupled to an LC resonator, in the photonic engineering and ultrastrong-coupling multiphoton quantum optics. An arbitrary Fock-state pulsed maser, where the artificial qubit plays the gain-medium role, is achieved via simply sweeping the gate-voltage bias. The resonantly pumped parametric qubit-resonator interface leads to a squeezed intraresonator field, which is utilizable for the quantum-limited microwave amplification. Moreover, upwards and downwards multiphoton quantum jumps may be observed in the driving-free steady-state system.