Stabilizing qubit coherence via tracking-control (pp350-363)
         Daniel A. Lidar and Sara Schneider
          doi: https://doi.org/10.26421/QIC5.45-6
Abstracts: We consider the problem of stabilizing the coherence of a single qubit subject to Markovian decoherence, via the application of a control Hamiltonian, without any additional resources. In this case neither quantum error correction/avoidance, nor dynamical decoupling applies. We show that using tracking-control, i.e., the conditioning of the control field on the state of the qubit, it is possible to maintain coherence for finite time durations, until the control field diverges.
Key words: coherent control, Makovian dynamics, decoherence