  We propose a sequence of pulses intended to preserve the state of a qubit in
the presence of strong, coherent coupling to another quantum system. The
sequence can be understood as a generalized SWAP and works in formal analogy to
the well-known spin echo. Since the resulting effective decoherence rate of the
qubits state is strongly influenced by the additional system, this sequence
might serve to protect its quantum state as well as negating the effects of the
coherent coupling. A possible area of application are large scale quantum
computing architectures, where spectral crowding of the resources might
necessitate a method to mitigate residual couplings.

Quantum Physics;Mesoscale and Nanoscale Physics