Applications of the Josephson mixer : ultrastrong coupling, quantum node and injection locking in conversion

Abstract : Superconducting circuits stand among the most advanced quantum information processing platforms. They have nowadays reached a maturity that offers a high level of controllability and a large variety of interactions that can be precisely designed on demand. The Josephson mixer is one such superconducting device that performs three-wave mixing at microwave frequencies. In this thesis, we describe three experiments in which the Josephson mixer was used for different applications. First, we have realized an effective ultrastrong coupling of two bosonic modes that allowed us to study the ground state properties of this system, such as the single mode and the two mode squeezing of the emitted radiation. Second, we have built a quantum node, able to generate and distribute entanglement over a microwave quantum network, as well as to store and release quantum information on demand. We have integrated an ancilla qubit to this device in order to increase the degree of control over the quantum state of the system. Finally, we have pushed the Josephson mixer beyond the parametric oscillation instability threshold, where we have demonstrated an atypical injection locking technique that relies on coherent frequency conversion in this non-degenerate device.
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Danijela Marković. Applications of the Josephson mixer : ultrastrong coupling, quantum node and injection locking in conversion. Mathematical Physics [math-ph]. PSL Research University, 2017. English. ⟨NNT : 2017PSLEE025⟩. ⟨tel-01774258⟩

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