Raphael Menu
The realization of quantum adiabatic dynamics lies at the core of quantum annealers and adiabatic quantum computers. The major issue is to realise the dynamics over sufficiently short times, thereby minimizing detrimental effects due to the coupling with the environment, and yet minimize deviations from adiabaticity, which unavoidably increase with the rate at which the Hamiltonian parameters are tuned. In this talk we propose a protocol which achieves fast adiabatic dynamics in a Landau-Zener problem via the implementation a quantum non-demolition (QND) measurement of the qubit. In the limit where the effective dynamics can be described by a Born-Markov master equation, the QND measurement induces an effective dephasing and dissipative dynamics which enforce adiabaticity. We show that the resulting fidelity of the adiabatic transfer significantly increases withthe strength of the QND coupling