Coherent-state qubits: entanglement and decoherence J. K. Asbóth, P. Adam, M. Koniorczyk and J. Janszky Eur. Phys. J. D, 30 3 (2004) 403-410 Published online: 10 August 2004 DOI: 10.1140/epjd/e2004-00094-2