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A method for preparing a spin-squeezed state of a cold atomic system

A technology of atomic spin and squeezed state, which is applied in automatic power control, material excitation analysis, Raman scattering, etc., to achieve simple, stable spin squeezed state, and improve the precision of quantum precision measurement

Active Publication Date: 2022-05-20
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a spin-squeezed state of a cold atomic system, so as to solve the problem of how to break through the quantum limit

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  • A method for preparing a spin-squeezed state of a cold atomic system
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  • A method for preparing a spin-squeezed state of a cold atomic system

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description and claims, the advantages and features of the present invention will be more clear. It should be noted that all the drawings are in very simplified form and inaccurate scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0028] It should be noted that, in order to clearly illustrate the content of the present invention, the present invention specifically cites multiple embodiments to further explain different implementation modes of the present invention, wherein the multiple embodiments are enumerated rather than exhaustive. In addition, for the sake of brevity, the content mentioned in the previous embodiment is often omitted in the latter embodiment, therefore, the content not mentioned in the later embodiment can refe...

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Abstract

The invention discloses a method for preparing a spin-squeezed state of a cold atomic system, comprising: providing a two-component spin system, which includes a two-dimensional potential well, and the two-dimensional potential well has an atomic spin state dependent on atomic interaction The energy level structure of the energy level structure; Raman light is applied to the two-dimensional potential well, so that the spin interaction equivalently produced by the atomic interaction in the two-dimensional potential well is not zero; recording the self from the two-dimensional potential well The spin fluctuation signal is used to determine the change of the spin squeeze from the spin fluctuation signal; according to the change of the spin squeeze, the spin squeeze property is measured when the spin squeeze parameter is minimum, so as to generate the spin squeeze state. The invention has the advantages of simple implementation, breaking through the limitation of the quantum system measurement limit, providing a new method for improving the precision of quantum precision measurement, and making the spin squeezed state more stable.

Description

technical field [0001] The invention belongs to the technical field of quantum precision measurement, in particular to a method for preparing a spin-squeezed state of a cold atomic system. Background technique [0002] Quantum precision measurement is based on the precise manipulation of microscopic particles such as atoms, molecules, or ions. Taking advantage of the advantages of stable microscopic system structure and less susceptible to external interference, the measurement accuracy of physical quantities has been greatly improved, and it has played a huge role in metrology. It is widely used in national defense, military, communication, finance and trade and other fields. [0003] The cold atom system uses laser cooling technology, and the atoms reach extremely low temperatures, which can realize precise control of the atomic system. So far, the most sophisticated optical frequency standards are based on cold atom or cold ion trapping technology, based on Al + The opt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/26G01N21/65
CPCH03L7/26G01N21/65
Inventor 陈星薛潇博张升康赵环王暖让张璐葛军
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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