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: 2020-10-30
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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  • Asymmetric quantum interferometer and method

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Embodiment

[0052] This embodiment uses 87 The energy level coherence of the "Λ" type of Rb atoms is correlated with the intensity and phase correlation of the signal light field, allowing light and atoms to achieve amplification and interference in the atomic ensemble through a high-gain Raman scattering process. Using the storage characteristics of the atomic ensemble, the phase superposition of multiple interactions is realized, so that the interference fringes appear asymmetric. The incident Raman light field and the light path of the Raman light field fed back through the optical mirror are spatially coincident.

[0053] See figure 1 , Shows the atomic energy level and the corresponding optical frequency diagram for realizing the present invention. Among them, 5 2 S 1 / 2 , 5 2 P 1 / 2 , 5 2 P 3 / 2 for 87 Fine structure of Rb atom, F=1, F=2 for fine structure 5S 1 / 2 The energy level difference of the superfine split is 6.8GHz. The dotted line shows 87 The virtual energy level of the Rb atom...

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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, and 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. They are widely used in many basic fields, such as gravitational wave measurement, gravity measurement, ranging, magnetic field measurement, etc. Therefore, the Phase sensitivity has become an important research direction of precision measurement. In the past, linear interferometers, including all-optical interferometers, atomic interferometers, and light-atom hybrid interferometers, all use linear beam splitters to achieve beam splitting. The signal (light field or atomic beam) is split along two Different paths are transmitted. The signals (light field or atomic beam) that have been split after a certain propagation distanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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