Controlling open quantum systems using fast transitions

PABLO POGGI; FERNANDO LOMBARDO; DIEGO WISNIACKI

Paraty (Rio de Janeiro)

Congreso; Quantum Information School and Workshop; 2013

Unitary control and decoherence appear to be irreconcilable in quantum mechanics. When a quantum system interacts with an environment, control strategies usually fail due to decoherence. Recently, we propose a time-optimal unitary control protocol suitable for quantum open systems. The method is based on the succesive diabatic and sudden switch transitions in the avoided crossings of the energy spectra of the closed systems. We show that the speed of this control protocol meets the fundamental bounds imposed by the quantum speed limit, thus making this scheme ideal for application where decoherence needs to be avoided. We show that our method can achieve complex control strategies with high accuracy in open quantum systems.