Quantum electrodynamic processes in electrical engineering circuits

M. Göppl

Yanbing Liu

Alexandre Blais, S. M. Girvin, William D. Oliver

Lei‐Lei Nian, Bo Zheng, Jing‐Tao Lü

Quantum-dot circuit quantum electrodynamics (QD-cQED) has enabled the probe and control of light-matter interaction at the elementary level, with the demonstration of nonclassical photon sources driven by inelastic electron tunneling. Due to the absence of the photon blockade mechanism, an general scheme for photon statistics engineering in QD-cQED is lacking. Based on current-driven joint interference effect, the authors propose here an all-electrical scheme to achieve arbitrary photon statistics with classical or quantum correlation by simply controlling bias voltage.

Garay, Linda Bertel

Eric C. Holland

Engineered quantum systems are poised to revolutionize information science in the near future. A persistent challenge in applied quantum technology is creating controllable, quantum interactions while preventing information loss to the environment, decoherence. In this thesis, we realize mesoscopic superconducting circuits whose macroscopic collective degrees of freedom, such as voltages and currents, behave quantum mechanically. We couple these mesoscopic devices to microwave cavities forming a cavity quantum electrodynamics (QED) architecture comprised entirely of circuit elements. This application of cavity QED is dubbed Circuit QED and is an interdisciplinary field seated at the intersection of electrical engineering, superconductivity, quantum optics, and quantum information science. Two popular methods for taming active quantum systems in the presence of decoherence are discrete feedback conditioned on an ancillary system or quantum reservoir engineering. Quantum reservoir engineering maintains a desired subset of a Hilbert space through a combination of drives and designed entropy evacuation. Circuit QED provides a favorable platform for investigating quantum reservoir engineering proposals. A major advancement of this thesis is the development of a quantum reservoir engineering protocol which maintains the quantum state of a microwave cavity in the presence of decoherence. This thesis synthesizes strongly coupled, coherent devices whose solutions to its driven, dissipative Hamiltonian are predicted a priori. This work lays the foundation for future advancements in cavity centered quantum reservoir engineering protocols realizing hardware efficient circuit QED designs.