Adiabatic Quantum Control of Dissipative State Preparation

Dissipative protocols for state preparation provide the ability to stabilize complex entangled states which are inherently robust to decoherence, though they typically exhibit a tradeoff between the preparation rate and the fidelity of the prepared state. In this talk I will describe a scheme for Bell state preparation employing only parametric qubit-qubit and qubit-resonator couplings, which afford a large degree of flexibility and control over the stabilized state. 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. Such control, here implemented through engineered dissipation, can circumvent the tradeoffs inherent in the scheme by first rapidly preparing a product state then adiabatically tuning to the desired Bell state. I will present analytical and numerical results which show that large speedups are possible with this approach even in the weak-dissipation regime. To understand the achievable speedup, I will examine the adiabaticity criteria in this driven-dissipative system and provide estimates of the resulting bounds on the state preparation time.