  Dynamical decoupling (DD) is a popular technique for protecting qubits from
the environment. However, unless special care is taken, experimental errors in
the control pulses used in this technique can destroy the quantum information
instead of preserving it. Here, we investigate techniques for making DD
sequences robust against different types of experimental errors while retaining
good decoupling efficiency in a fluctuating environment. We present
experimental data from solid-state nuclear spin qubits and introduce a new DD
sequence that is suitable for quantum computing and quantum memory.
