Adiabatic Quantum Control of Dissipative State Preparation

Dissipative protocols for state preparation provide the ability to produce complex entangled states which are inherently robust to decoherence. Protocols based on parametric interactions are particularly powerful in this regard, with the potential for much superior performance compared to resonant schemes while simultaneously providing a large degree of flexibility and control over the stabilized state [1]. In this talk I will describe a scheme for preparing Bell states which employs only parametric qubit-qubit and qubit-resonator couplings. Both the amplitudes and phases of these couplings are tunable in situ, providing a natural avenue to implement time-dependent control of the state preparation dynamics. I will present numerical and analytical results on the application of time-dependent parametric controls while ensuring that the evolution is adiabatic, such that the system remains in the instantaneous dark state of the dynamics. Such fast time-dependent control is within reach of current experimental capabilities, and can enable a large (>10x) reduction in state preparation times. [1] E. Doucet, F. Reiter, L. Ranzani, and A. Kamal, arXiv:1810.03631 (2018).