YQI Talk - Yao Lu - University of Chicago

Event time: 
Thursday, February 14, 2019 - 11:00am to 12:00pm
YQI Seminar Room - 4th Room See map
17 Hillhouse Ave
Event description: 

Parametric control of flux-tunable superconducting circuits

Quantum computing is at an exciting time, with practical quantum processor coming closer to experimental realization. Yet a major challenge in building a practical quantum computer is to generate and manipulate interactions between its many components. Superconducting (SC) qubits are promising candidates not only because they have strong coupling and easy readout, but also for allowing versatile parametric control that can realize different effective interactions at will, which might be difficult to achievethrough other means. In my talk, I will start from the simple example of parametrically flux modulated SC qubit and demonstrate its application towards quantum communication between remote SC modules. In the second part of my talk, I will introduce a novel SC tunable coupler device that allows for the direct dc-flux control of qubit-qubit or qubit-cavity coupling strength without sacrificing qubit coherence, as well as the convenient realization of blue-and red-sideband interactions through appropriate choice of parametric flux-modulation frequency. By engineering the dissipative system-environment interactions through sophisticated parametric control of this tunable coupler device, we achieved the autonomous stabilization of arbitrary qubit states, in a manner akin to laser cooling in atomic physics. Finally, I will present our on-going experimental effort of extending the idea of autonomous stabilization to autonomous quantum error correction, an important step towards the ultimate realization of universal quantum computer.