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Magnetic field single coils for balancing gravity of atoms in quantum chaos

A single-coil, atomic technology, applied in the field of single-coil magnetic field, can solve the problems of complex structure, increased experimental complexity, large volume, etc., and achieve the effect of simple and stable structure

Inactive Publication Date: 2019-02-01
TRANSCOM INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In various atomic cooling technologies such as laser cooling, evaporative cooling, etc., most of the first main group elements with relatively large atomic mass numbers in the periodic table are used, such as potassium rubidium cesium (39K, 87Rb, 133Cs), etc. Due to the heavy weight of these atoms, it is difficult to manipulate the atoms in the experiment to stabilize them for a long time, usually using a more complex coil design, such as quadrupole, Ioffe-Ptitchard, Quic coil, etc., but the structure of these coils is complex , the volume is large, and the current used usually reaches tens or even dozens of amperes. On the one hand, it requires a more complicated circuit control system to provide the current required by the coil. On the other hand, a large current generates a lot of heat and often requires cooling of the coil. device, increasing the complexity of the experiment

Method used

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  • Magnetic field single coils for balancing gravity of atoms in quantum chaos
  • Magnetic field single coils for balancing gravity of atoms in quantum chaos
  • Magnetic field single coils for balancing gravity of atoms in quantum chaos

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: as Figure 1-8 As shown, the present invention provides a conical magnetic field single coil for realizing balanced atomic gravity in quantum chaos, including a pair of quadruple coils 2 on the X-axis direction, an IOFFE coil 4 on the Z-axis direction, and an IOFFE coil 4 on the Y-axis direction. The truncated conical coil 3; the atom is located in the vacuum cavity 5 formed by the quadruple coil 2, the IOFFE coil 4 and the truncated conical coil 3, and the truncated conical coil 3 is fixed directly below the atom 1 on the Y axis; the obtained experimentally The ultracold atoms are at x=y=0, z=0.75 cm. The gravity direction is the y-axis direction. The magnetic field potential energy curve, gravitational potential energy curve and total potential energy curve generated by the conical coil 3 in the vacuum chamber 5 are as follows: Figure 3-5 Shown:

[0035] in the y direction;

[0036] Since atom 1 is affected by gravity, according to

[0037]

[0...

Embodiment 2

[0045] Embodiment 2: as Figure 9-11 Shown, the present invention provides a kind of rectangular magnetic field single coil that realizes balance atomic gravity in quantum chaos; According to

[0046]

[0047] Therefore, to reduce the binding frequency, it is necessary to reduce the initial position QaStart and increase the initial radius QRStart. However, according to the actual situation of the ultracold atomic device, if the rectangular coil 7 is placed under the vacuum chamber, QaStart>2.8cm, QRStart<7cm.

[0048] In the experiment, QaStart=2.9cm, QRStart=2.8cm. According to the above theory, increase QRStart=4cm, but the size of the actual space determines that the rectangular coil 7 must move downwards, so that QRStart=5cm. Therefore, when the current is 5.5A, the first-order gradient of the magnetic field is 15 (G / cm), and the confinement frequency is 2.7 Hz, and there is no significant decrease.

[0049] According to the actual space position, by continuously tes...

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Abstract

The invention relates to the technical field of quantum chaos, in particular to magnetic field single coils for balancing the gravity of atoms in quantum chaos. How to balance the gravity of the atomsin the two single coils of different structures is involved. A real experiment platform system based on the ultra-cold atoms is mainly a single-coil magnetic field for balancing the gravity of the 87Rb atoms, and the required magnetic field current is only a few amps since the driving current of the coils is small; the two single coils of different structures are designed for balancing the gravity of the gravity of the atoms, the structures of the single coils are simple and stable, and the scheme can be expanded and improved to adapt to different experiment platforms; the arrangement schemeis suitable for various atomic and molecular experiments, and by means of the design of the single coils, any atomic ensemble is captured and balanced.

Description

technical field [0001] The invention relates to the technical field of quantum chaos, in particular to a magnetic field single coil for realizing balance atomic gravity in quantum chaos. Background technique [0002] In recent years, the ensemble of ultracold atoms has been one of the most popular directions of research and attention. One of the important aspects is the magnetic trapping of ultracold neutral particles, such as the quantum chaos phenomenon of ultracold atoms. The Schrödinger equation is linear and in principle does not create chaos. At the same time, according to the principle of correspondence, there should be quantum irregular motion in quantum mechanics, namely chaos. At present, there is no direct experimental evidence to prove that such quantum irregular motion exists in quantum mechanics. Quantum chaos reflects the sensitivity of the system to the initial state, and the experiment to realize quantum chaos needs to balance the gravity of atoms during t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/06
CPCH01F7/06
Inventor 王中凯
Owner TRANSCOM INSTR