Superconducting CQED


Abdul Mohamed, MSc. Student
Armin Tabesh, MSc. Student
Danial Davoudi, PhD. Student

Our research focuses on the exploration of quantum phenomena within superconducting circuits:

Manipulation and readout of the superconducting qubits: Achieving quantum information processing in the laboratory necessitates highly rapid and accurate quantum measurements of qubits. In our research, we focus on demonstrating the efficacy of an amplified interferometer in improving the quality of dispersive qubit measurements, specifically those conducted on superconducting transmon qubits. We accomplish this by employing homodyne detection on an amplified microwave signal. By leveraging this approach, we aim to enhance the precision and reliability of qubit measurements, facilitating more robust quantum information processing.

Nonlinear phase dynamics in the photonic junction: The coupling between two nonlinear resonators presents an exciting opportunity to investigate nonlinear phase dynamics and explore the behavior of the two-mode Bose-Hubbard model within quantum circuits. In our research, we focus on studying the collective dynamics of a driven two-mode Bose-Hubbard model operating under the influence of photonic Josephson interactions. By delving into this photonic Josephson interaction regime, we aim to gain insights into the intriguing behavior and phenomena exhibited by the system, shedding light on the underlying physics and potential applications in quantum circuits.

Remote entanglement distribution and stabilization between multiple qubits: The primary objective of this project is to realize efficient protocols for entanglement distribution and stabilization between multiple superconducting nodes (qubits) that are coupled to distant cavities. To achieve this, we utilize a Josephson-based three-wave mixing device that effectively mediates and controls the coupling between the cavities. This device generates a delocalized two-mode squeezed state, establishing entanglement between the remote cavities. By incorporating state-of-the-art, in situ quantum-limited amplifiers, we enable the distribution of remote entanglement among numerous superconducting qubits. This approach holds great promise for modular quantum computing, as it facilitates the construction of a quantum network capable of performing distributed quantum operations and information processing tasks.

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