Spin squeezing: transforming one-axis twisting into two-axis twisting

Squeezed spin states possess unique quantum correlation or entanglement and are significantly promising for advancing quantum information processing and quantum metrology. In recent back-to-back publications [C. Gross et al., Nature (London) 464, 1165 (2010) and Max F. Riedel et al., Nature (London)...

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Bibliographic Details
Published in:Physical review letters 2011-07, Vol.107 (1), p.013601-013601, Article 013601
Main Authors: Liu, Y C, Xu, Z F, Jin, G R, You, L
Format: Article
Language:English
Subjects:
ANGULAR MOMENTUM
ATOMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONDENSATES
CORRELATIONS
FLUCTUATIONS
INFORMATION
INTERACTIONS
NOISE
PARTICLE PROPERTIES
PULSES
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION
SPIN
VARIATIONS
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Summary:Squeezed spin states possess unique quantum correlation or entanglement and are significantly promising for advancing quantum information processing and quantum metrology. In recent back-to-back publications [C. Gross et al., Nature (London) 464, 1165 (2010) and Max F. Riedel et al., Nature (London) 464, 1170 (2010)], reduced spin fluctuations are observed leading to spin squeezing at -8.2 and -2.5 dB, respectively, in two-component atomic condensates exhibiting one-axis-twisting interactions. The noise reduction limit for the one-axis twisting scales as ∝1/N(2/3), which for a condensate with N∼10(3) atoms is about 100 times below the standard quantum limit. We present a scheme using repeated Rabi pulses capable of transforming the one-axis-twisting spin squeezing into the two-axis-twisting type, leading to Heisenberg limited noise reduction ∝1/N or an extra tenfold improvement for N∼10(3).
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.107.013601