DECOHERENCE-FREE MULTIPARTITE ATOMIC ENTANGLEMENT IN A CAVITY QED SYSTEM
Matteo Bina, Federico Casagrande, ALFREDO LULLI · International Journal of Quantum Information · 2009
We present analytical results on entanglement and decoherence in a system of N strongly driven two-level atoms resonantly coupled to a dissipative cavity mode. In the specific cases of N = 3 and 4 qubits we show the existence of decoherence-free subspaces for the whole system and/or the atomic subsystem and we discuss examples where a multipartite qubit entanglement remains preserved. Also we illustrate the conditional preparation of cat-like states of the cavity field and the generation of atomic correlations.