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VOLUME 55 (1992) | ISSUE 1 | PAGE 19
Induction of collective phase coherence in a quantum system without a resonant phasing field
The induction of a collective phase coherence is analyzed in terms of a phasing of dipole moments in a momentum phase subspace. The coherence is assumed to be induced by a <5-function video pulse of a magnetic field HxyS (or of an electric field EXJItS). The length of this pulse, τδ, is substantially shorter than the period (T0) of the quantum transition: ts 4 T0. Experimental results are reported. They demonstrate microscopic structure in the onset of a coherence signal Sy S at the frequency (f0) of a Zeeman transition in the spin system of 133Cs atoms. It is suggested that quantum transitions could be induced at 1010 Hz, in the microwave range, by this method. This approach opens up the possibility of developing, in particular, highly stable atomic frequency standards in which a continuous free-oscillation signal would be induced without a Ramsey resonator and without a system for synthesizing the frequency of the resonant microwave field.