Phys. Rev. Lett. 56, 2797–2799 (1986)Shelved optical electron amplifier: Observation of quantum jumpsReceived 5 May 1986; published in the issue dated 30 June 1986 We demonstrate here the direct observation of quantum jumps between the 62S1/2 state and the 52D5/2 state of an individual laser-cooled Ba+ ions contained in a radio-frequency trap. The state detection and cooling are performed by two lasers which cause 62S1/2-62P1/2-52 D3/2 transitions. Incoherent excitation to the 52D5/2 state (via the 62P3/2 level) causes the fluorescence from the 62P1/2 state to be suppressed for >30-sec lifetime of that state, after which the fluorescence reappears. The resulting ‘‘telegraph signal’’ provides a direct monitor of the atomic state. © 1986 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.56.2797
DOI:
10.1103/PhysRevLett.56.2797
PACS:
32.80.Pj, 32.90.+a, 41.70.+t
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