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    We explored two-photon processes in a transmon artificial atom, controlling microwave field interactions. This research demonstrates tunable transparency and microwave amplification using Autler-Townes splitting in superconducting circuits.

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    Area of Science:

    • Quantum optics
    • Superconducting circuits
    • Artificial atoms

    Background:

    • Transmon artificial atoms are crucial for quantum computing and quantum optics.
    • Understanding multi-photon processes in these systems is key to developing advanced quantum technologies.
    • Control over quantum states via microwave fields is essential for manipulating qubits.

    Purpose of the Study:

    • To experimentally investigate two-photon processes in a 3-level transmon system.
    • To demonstrate control over one-photon and two-photon transitions using microwave fields.
    • To explore microwave amplification via two-photon interactions.

    Main Methods:

    • Utilizing a 3-level transmon artificial atom.
    • Applying two microwave fields for controlled interactions.
    • Employing a control tone to induce Autler-Townes splitting.
    • Measuring transmission changes for one-photon and two-photon transitions.

    Main Results:

    • Achieved controlled one-photon and two-photon transparency by manipulating resonance conditions.
    • Observed Autler-Townes splitting as the mechanism for transparency control.
    • Demonstrated microwave amplification through 4-wave mixing (3% transmission increase) and two-photon optical pumping (11% narrowband increment).

    Conclusions:

    • Experimental control over two-photon processes in transmons is feasible.
    • Autler-Townes splitting provides a tunable mechanism for quantum state manipulation.
    • Two-photon processes offer pathways for efficient microwave amplification in superconducting circuits.