What Is a Three-Level Laser?

Three energy levels system. The first laser, the ruby laser, was a three-level system.

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Superconducting quantum circuits and qubits have outstanding advantages such as low dissipation, easy regulation, flexible device design, and easy scale.They are strong competitors for solid-state quantum computing, and also quantum mechanics, atomic physics, quantum optics, and quantum simulation. A good research platform. Systematic in-depth research has been carried out on superconducting phase qubits, superconducting multilevel and resonator coupling systems, and nSQUID new superconducting qubits. The design and preparation of superconducting qubits ^[1] .

Using the micro-nano processing experimental process and multilayer film technology, firstly, a high-quality niobium film is grown on the cleaned Si substrate by magnetron sputtering as the lead circuit and resonant cavity circuit of the superconducting qubit. Then, Electron beam evaporation and chemical vapor deposition are used to prepare the superconducting qubit inductors and capacitors, and dual-angle electron beam evaporation is used to prepare high-quality Al / AlO_x / Al Josephson junctions. The preparation of Josephson knot is the core of sample preparation ^[2] .