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Preparation method of spin compression state of cold atom system

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

Active Publication Date: 2021-06-22
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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  • Abstract
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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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  • Preparation method of spin compression state of cold atom system
  • Preparation method of spin compression state of cold atom system
  • Preparation method of spin compression state of cold atom 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 compression state of a cold atom system, which comprises the following steps: providing a two-component spin system which comprises a two-dimensional potential well which has an energy level structure of which the atomic spin state depends on atomic interaction; applying Raman light to the two-dimensional potential well, so that spin interaction equivalently generated by atomic interaction in the two-dimensional potential well is not zero; recording a spin fluctuation signal from the two-dimensional potential well, and determining a change condition of spin compression from the spin fluctuation signal; and according to the change condition of the spin compression, measuring the spin compression property when the spin compression parameter is minimum so as to generate a spin compression state. The method has the advantages that the method is easy to implement, the limitation of the measurement limit of a quantum system is broken through, a new method is provided for improving the quantum precision measurement precision, and the spin compression state is 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...

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Application Information

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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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