Pure superposition states of atoms generated by a bichromatic elliptically polarized field

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A. V. Taichenachev,^1,2 V. I. Yudin,^1,2 V. L. Velichansky,³ A. S. Zibrov,^4,3 and S. A. Zibrov³
¹Novosibirsk State University, Novosibirsk 630090, Russia
²Institute of Laser Physics SB RAS, Novosibirsk 630090, Russia
³P. N. Lebedev Physical Institute RAS, Moscow 117924, Russia
⁴Physics Department, Harvard University and Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, 02138, USA

Received 23 April 2005; published 12 January 2006

Weidentify the specific polarizations for the two components of abichromatic field, which produce pure superposition states of atoms witha specific magnetic quantum number m via coherent population trapping.The superposition states are composed of two Zeeman substates magneticquantum number m of the two ground-state hyperfine levels witharbitrary angular momenta F₁ and F₂. It is established thatin the general case of m [not-equal] 0, optical fields with ellipticalpolarizations are needed for the preparation of such a purestate. It is shown analitically that a unique advantage ofthe D1 line (over the D2 line) of alkali-metal atomsis the possibility that pure m-m states may be generatedeven if the excited-state hyperfine levels are not spectrally resolved.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.013812
DOI:	10.1103/PhysRevA.73.013812
PACS:	42.50.Gy; 32.70.Jz; 32.80.Bx; 33.70.Jg 42.50.Gy Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption 32.70.Jz Atomic line shapes, widths, and shifts 32.80.Bx Atomic level crossing and optical pumping 33.70.Jg Molecular line and band widths, shapes, and shifts YEAR: 2006
KEYWORDS:	Zeeman effect, ground states, hyperfine structure, radiation pressure, quantum optics

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