Reservoir-engineering shortcuts to adiabaticity

Understand

We propose a protocol that achieves fast adiabatic transfer between two orthogonal states of a qubit by coupling with an ancilla.

• The qubit undergoes Landau-Zener dynamics, whereas the coupling realizes a time-dependent Hamiltonian, which is diagonal in the spin's instantaneous Landau-Zener eigenstates.
• The ancilla (or meter), in turn, couples to a thermal bath, such that the overall dynamics is incoherent.
• We analyse the protocol's fidelity as a function of the strength of the coupling and of the relaxation rate of the meter.