Cao, Y (reprint author), Tsinghua Univ, Key Lab Atom & Mol Nanosci, Beijing 100084, Peoples R China.
部门归属:
[Cao, Ye; Long, Gui Lu] Tsinghua Univ, Key Lab Atom & Mol Nanosci, Beijing 100084, Peoples R China; [Cao, Ye; Long, Gui Lu] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China; [Huo, Wen Yi] Inst Appl Phys & Computat Math, Beijing 100088, Peoples R China; [Ai, Qing] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China; [Long, Gui Lu] Tsinghua Natl Lab Informat Sci & Technol, Beijing 100084, Peoples R China
英文摘要:
We study the theory of degenerate three-wave mixing and the generation of squeezed microwaves using circuit quantum electrodynamics in solid state circuits. The Hamiltonian for degenerate three-wave mixing, which seemed to be given phenomenologically in quantum optics, is derived by quantum mechanical calculations. The nonlinear medium needed in three-wave mixing is composed of a series of superconducting charge qubits which are located inside two superconducting transmission-line resonators. Here, the multiqubit ensemble is present to enhance the effective coupling constant between the two modes in the transmission-line resonators. In the squeezing process, the qubits are kept in their ground states so that their decoherence does not corrupt the squeezing. The main obstacle preventing a large squeezing efficiency is the decay rate of the transmission-line resonator.
