Phys. Rev. A 77, 023824 (2008) [5 pages]Interacting dark states with enhanced nonlinearity in an ideal four-level tripod atomic systemReceived 21 October 2007; published 21 February 2008 We present an experimental system to generate large cross-phase modulation (XPM) in cold rubidium atoms. By using an efficient state-preparation technique in the 87Rb D1 line, an ideal four-level tripod-type atomic system is formed, which generates large cross-Kerr nonlinearity via interacting dark states in this system. The induced phase shift due to XPM for the probe beam is measured for different trigger beam intensities, which is the key to achieving conditional quantum phase gates and many other applications in quantum information processing. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.023824
DOI:
10.1103/PhysRevA.77.023824
PACS:
42.50.Gy, 42.65.−k, 32.80.−t
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