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Asymmetric quantum interferometer and method

A quantum interference, asymmetric technology, applied in the field of nonlinear optics, which can solve problems such as complex experimental systems and limited improvement

Active Publication Date: 2019-04-09
EAST CHINA NORMAL UNIV
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Problems solved by technology

In principle, nonlinear interferometers have many advantages over linear interferometers. Its phase sensitivity limit is 1 / N, which is somewhat higher than that of linear interferometers. However, its implementation requires an extremely complex experimental system, and currently reported Compared with the linear interferometer of the same magnitude, the sensitivity has a limited improvement

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Embodiment

[0052] This example uses 87 The energy level coherence of the "Λ" type atoms of Rb atoms and the intensity correlation and phase correlation between the signal light field allow light and atoms to achieve amplification and interference in the atomic ensemble through a high-gain Raman scattering process. Utilizing the storage property of the atomic ensemble, the phase superposition of multiple interactions is realized, making the interference fringes asymmetrical. The incident Raman light field and the light path of the Raman light field fed back through the optical mirror are spatially coincident.

[0053] refer to figure 1 , showing the atomic energy levels and corresponding optical frequency diagrams for realizing the present invention. Among them, 5 2 S 1 / 2 、5 2 P 1 / 2 、5 2 P 3 / 2 for 87 The fine structure of Rb atom, F=1, F=2 is the fine structure 5S 1 / 2 The hyperfine division of , its energy level difference is 6.8GHz. The dashed line shows 87 The virtual energy...

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Abstract

The invention discloses an asymmetric quantum interferometer and method. Coherent light such as a semiconductor laser or a titanium sapphire laser is used as an initial incident light source, and theasymmetric quantum interferometer is realized based on a high-gain raman scattering process between the light and a substance. An experimental device is mainly an action medium and comprises two coherent light sources P, a raman light field W, a batch of optical components and a phase shifter. The whole device is simple in structure and stable in system. According to the asymmetric quantum interferometer in the invention, the high-gain raman scattering process is used as a beam splitter to realize beam splitting and beam combination of light and atoms, the interference output strength is in asymmetric and similar sawtooth wave pattern distribution along with the phase difference of two interference arms, and the signal strength at certain phases is very sensitive to phase change. Comparedwith the traditional all-optical interferometer and the symmetric nonlinear interferometer, the asymmetric quantum interferometer has higher phase sensitivity. The interferometer has an important application prospect in the field of precision measurement and quantum information.

Description

technical field [0001] The invention relates to the fields of nonlinear optics, quantum optics and precision measurement, in particular to a brand-new asymmetric quantum interferometer and method. Background technique [0002] At present, interferometers play an important role in the fields of nonlinear optics, quantum optics and precision measurement, and are widely used in many basic fields, such as gravitational wave measurement, gravity measurement, distance measurement, magnetic field measurement, etc. Phase sensitivity has become an important research direction of precision measurement. Previous linear interferometers, including plenoptic interferometers, atomic interferometers, and light-atom hybrid interferometers, all use linear beam splitters to achieve beam splitting, and the signal (light field or atomic beam) is split along two Different paths are transmitted, and the signal (light field or atomic beam) that is split after a certain propagation distance is comb...

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Application Information

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IPC IPC(8): G01B9/02G01J9/02
CPCG01B9/02007G01B9/02027G01J9/02
Inventor 陈丽清杨培玉吴媛袁春华
Owner EAST CHINA NORMAL UNIV
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