CN-122016737-A - Method for measuring interaction strength between two Redberg atomic ensembles

CN122016737ACN 122016737 ACN122016737 ACN 122016737ACN-122016737-A

Abstract

The invention discloses a method for measuring interaction strength between two reed-burg atom ensembles, which comprises the following steps of S1, S2, respectively measuring and obtaining single-group energy level frequency shift of a first reed-burg atom ensemble A and single-group energy level frequency shift of a second reed-burg atom ensemble B, S3, measuring and obtaining joint energy level frequency shift under a coupling state, and S4, calculating and obtaining interaction strength V AB between the first reed-burg atom ensemble A and the second reed-burg atom ensemble B. According to the invention, the single group frequency shift of the two ensembles in the isolation state and the combined frequency shift of the two ensembles in the coupling state are respectively measured, and the interaction strength between the ensembles is indirectly calculated according to the single group frequency shift, so that the measurement with the advantages of non-destructiveness, real-time dynamic monitoring and high system universality is realized.

Inventors

LIANG ZHENTAO
LI CHONGXIN
ZHANG JINGLING
LAI WEIHAO

Assignees

华南师范大学

Dates

Publication Date: 20260512
Application Date: 20260302

Claims (10)

1.A method for measuring the strength of interaction between two reed burg atomic ensembles, comprising the steps of: S1, preparing a first Redberg atomic ensemble A and a second Redberg atomic ensemble B; s2, under the condition that the first Redberg atomic ensemble A and the second Redberg atomic ensemble B are not coupled, measuring and obtaining single-group energy level frequency shift of the first Redberg atomic ensemble A and single-group energy level frequency shift of the second Redberg atomic ensemble B respectively; S3, placing the first Redberg atom ensemble A and the second Redberg atom ensemble B at a preset space distance to enable the first Redberg atom ensemble A and the second Redberg atom ensemble B to interact with each other, and measuring to obtain a combined energy level frequency shift in a coupling state; S4, calculating to obtain interaction strength V AB between the first Redberg atom ensemble A and the second Redberg atom ensemble B based on the single-group energy level frequency shift of the first Redberg atom ensemble A, the single-group energy level frequency shift of the second Redberg atom ensemble B and the combined energy level frequency shift.
2. The method of measuring the interaction strength between two reed burg atom ensembles according to claim 1, wherein the interaction strength V AB is calculated according to the following formula: Wherein, the , , 、 The energy level of the single group of the first and the second reed-burg atom systems A and B are shifted, 、 The interaction strength between atoms in the first and second Redberg atom ensembles A and B, 、 The density of the number of the Redberg atoms of the first Redberg atom system A and the second Redberg atom system B, Is a joint energy level shift in the coupled state.
3. The method for measuring interaction strength between two reed-burg atom ensembles according to claim 1, further comprising the step of S5 monitoring the trend of the interaction strength V AB with the preset spatial distance in real time by adjusting the preset spatial distance between the first reed-burg atom ensemble a and the second reed-burg atom ensemble B; Or, by adjusting the number density of the reed-burg atoms of the first reed-burg atom ensemble a and the second reed-burg atom ensemble B, monitoring the change trend of the interaction strength V AB along with the number density of the reed-burg atoms in real time.
4. The method of measuring the interaction strength between two reed burg atom ensembles according to claim 1, wherein the first reed burg atom ensemble a and the second reed burg atom ensemble B are prepared by laser excitation of alkali metal atoms including rubidium atoms or cesium atoms.
5. The method of measuring the strength of interaction between two sets of reed burg atoms as set forth in claim 4, wherein said laser excites said alkali metal atoms to a specific Gao Lide burg state.
6. The method of claim 5, wherein the specific Gao Lide fort states comprise the 63D5/2 states.
7. The method of measuring the interaction strength between two reed-burg atomic ensembles according to claim 1, wherein the single-cluster energy level shift of the first reed-burg atomic ensemble a, the single-cluster energy level shift of the second reed-burg atomic ensemble B, and the combined energy level shift are measured, and wherein a spectral reading is performed using weak probe light to achieve a nondestructive or perturbation measurement of atomic quantum states.
8. The method of measuring the interaction strength between two sets of Redberg atoms according to claim 7, wherein the spectral reading is performed by monitoring the transition frequency of the Redberg atoms to the 64P3/2 state with a frequency-tunable detection laser, and precisely measuring the single-set energy level shift of the first set of Redberg atoms A, the single-set energy level shift of the second set of Redberg atoms B, and the combined energy level shift by a frequency-locking or spectral scanning technique.
9. The method according to claim 1, wherein in the step S1, atoms are excited to different target Lidberg states by adjusting the wavelength of the excitation laser to change the number of Lidberg primary quanta of the first and/or the second Lidberg atomic enses A and B independently or jointly, and the dependence of the interaction intensity V AB on the number of Lidberg primary quanta is studied.
10. The method according to claim 1, wherein in the step S3, the preset spatial distance is systematically changed to obtain a curve of the interaction strength V AB according to the distance, and the degree of the interaction strength V AB is verified to be consistent with the theoretical model.

Description

Method for measuring interaction strength between two Redberg atomic ensembles Technical Field The invention relates to the technical field of quantum physical measurement and precise measurement, in particular to a method for measuring interaction strength between two Redberg atomic ensembles. Background In the front research of quantum multi-body physics, quantum network, quantum sensing and the like, the Redburg atoms have the characteristics of strong interaction, long coherence time, high sensitivity to external fields and the like, so that the Redburg atoms become an important physical platform for realizing quantum simulation, quantum information processing and high-precision sensing. The accurate measurement and control of the coupling strength between two spaced apart groups of Redberg atoms are key technical bases for constructing quantum network nodes, realizing distributed quantum sensing and researching multi-body quantum dynamics. However, the existing method for measuring the interaction between the Redberg atomic ensembles has obvious technical limitations that firstly, a direct detection means (such as by measuring macroscopic electric dipole moment) is often required to apply strong interference to a system, so that the quantum state is irreversibly collapsed or decohered, the quantum characteristics of the system are destroyed, secondly, the existing method is difficult to realize real-time and dynamic monitoring of the interaction intensity, most of the existing method can only acquire the interaction intensity after steady state or time averaging and cannot observe the transient evolution process of the interaction intensity, and furthermore, many existing schemes depend on specific experimental architectures (such as a high-quality optical resonant cavity, a precisely arranged optical lattice and the like), and the system is complex and low in compatibility and is difficult to flexibly apply to different atomic systems or experimental platforms. Therefore, in order to solve the above problems, an interaction strength measurement method capable of maintaining quantum coherence, supporting real-time dynamic monitoring and having high system universality is developed, which has important significance for promoting the development of quantum technology. Disclosure of Invention In order to overcome the defects in the prior art, the invention aims to provide a method for measuring the interaction strength between two Redberg atom ensembles, which is used for indirectly calculating the interaction strength between the ensembles by respectively measuring the single group frequency shift of the two ensembles in an isolated state and the combined frequency shift of the two ensembles in a coupled state, thereby realizing the measurement with non-destructive, real-time dynamic monitoring and high system universality. In order to achieve the purpose of the invention, the following scheme is adopted: A method of measuring the strength of interaction between two reed burg atomic ensembles, comprising the steps of: S1, preparing a first Redberg atomic ensemble A and a second Redberg atomic ensemble B; s2, under the condition that the first Redberg atomic ensemble A and the second Redberg atomic ensemble B are not coupled, measuring and obtaining single-group energy level frequency shift of the first Redberg atomic ensemble A and single-group energy level frequency shift of the second Redberg atomic ensemble B respectively; S3, placing the first Redberg atom ensemble A and the second Redberg atom ensemble B at a preset space distance to enable the first Redberg atom ensemble A and the second Redberg atom ensemble B to interact with each other, and measuring to obtain a combined energy level frequency shift in a coupling state; S4, calculating to obtain interaction strength V AB between the first Redberg atom ensemble A and the second Redberg atom ensemble B based on the single-group energy level frequency shift of the first Redberg atom ensemble A, the single-group energy level frequency shift of the second Redberg atom ensemble B and the combined energy level frequency shift. Further, the interaction strength V AB is calculated according to the following formula: Wherein, the , , 、The single problem energy level frequency shifts of the first and second reed-burg atom ensembles a and B,、The interaction strength between atoms in the first and second Redberg atom ensembles A and B,、The density of the number of the Redberg atoms of the first Redberg atom system A and the second Redberg atom system B,Is a joint energy level shift in the coupled state. Further, the method for measuring the interaction strength between two reed-burg atom ensembles further comprises the step S5 of monitoring the change trend of the interaction strength V AB along with the preset space distance in real time by adjusting the preset space distance between the first reed-burg atom ensemble A and the second reed-burg atom ensembl