Wiley, Fortschritte der Physik, 45(51), p. 462-468, 2003
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We present a superconducting tunnel junction circuit which behaves as a controllable atom, and whose ground and first excited state form an effective spin 1/2. By applying microwave pulses, we have performed on this circuit experiments demonstrating the controlled manipulation of the spin : Rabi precession, Ramsey interferences, and spin echoes. ; Comment: To be published in the proceedings of the conference "Quantum Interferometry IV" (Trieste, March 2002) in a special issue of Fortschritte der Physik