Observation of prolonged coherence time of the collective spin wave of an atomic ensemble in a paraffin-coated {sup 87}Rb vapor cell

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.80.062303· OSTI ID:21352303

Shuo, Jiang; Xiaoming, Luo; Liqing, Chen; Bo, Ning ^[1]; Shuai, Chen ^[2]; Jingyang, Wang; Zhiping, Zhong ^[3]; Jianwei, Pan ^[1]

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1. Physics Department, Tsinghua University, Beijing 100084 (China)
2. Physikalisches Institute, Universitaet Heidelberg, 69120 Heidelberg (Germany)
3. College of Physical Sciences, Graduate University of the Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049 (China)

We report a prolonged coherence time of the collective spin wave of a thermal {sup 87}Rb atomic ensemble in a paraffin-coated cell. The spin wave is prepared through a stimulated Raman process. The long coherence time is achieved by prolonging the lifetime of the spins with paraffin coating and minimize dephasing with optimal experimental configuration. The observation of the long-time-delayed-stimulated Stokes signal in the writing process suggests the prolonged lifetime of the prepared spins; a direct measurement of the decay of anti-Stokes signal in the reading process shows the coherence time is up to 300 mus after minimizing dephasing. This is 100 times longer than the reported coherence time in the similar experiments in thermal atomic ensembles based on the Duan-Lukin-Cirac-Zoller and its improved protocols. This prolonged coherence time sets the upper limit of the memory time in quantum repeaters based on such protocols, which is crucial for the realization of long-distance quantum communication. The previous reported fluorescence background in the writing process due to collision in a sample cell with buffer gas is also reduced in a cell without buffer gas.

• OSTI ID: 21352303
• Journal Information: Physical Review. A, Vol. 80, Issue 6; Other Information: DOI: 10.1103/PhysRevA.80.062303; (c) 2009 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
FLUORESCENCE
LIFETIME
PARAFFIN
RAMAN EFFECT
RUBIDIUM
RUBIDIUM 87
SIGNALS
SPIN
SPIN WAVES
VAPORS
ALKALI METALS
ALKANES
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
ELEMENTS
EMISSION
FLUIDS
GASES
HYDROCARBONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
LUMINESCENCE
METALS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PARTICLE PROPERTIES
PHOTON EMISSION
RADIOISOTOPES
RUBIDIUM ISOTOPES
WAXES
YEARS LIVING RADIOISOTOPES