Constant current source device based on quantum natural references and implementation method

Abstract

The invention discloses a constant current source device based on quantum natural references and an implementation method. The constant current source device comprises a magnetic shielding cylinder 1, a standard coil 2, a pumping-detection type atom magnetometer 3, a current source 4, a computer 5 and a load 6. The magnetic shielding cylinder 1 is used for shielding a geomagnetic field, the standard coil 2 is arranged in the magnetic shielding cylinder 1 in an axial symmetry mode, and the current source 4 supplies a current to the load 6 and the standard coil 2 to generate a magnetic field. A probe part of the pumping-detection type atom magnetometer 3 is arranged at the geometric center of the standard coil 2 and is used for measuring a uniform magnetic field on the axis of the standard coil 2. The computer 5 is connected with the current source 4 and is used for controlling the current supplied to the load 6 and the standard coil 2 by the current source 4. The current output by the precision current source is locked to the Larmor precession frequency corresponding to magnetic resonance Zeeman transition, the stability of the output current of the precision current source is effectively improved, drift is reduced, and a low-drift constant current source device based on a quantum natural reference can be obtained.

Description

technical field [0001] The disclosure belongs to the technical field of electromagnetic metrology, and in particular relates to a constant current source device and an implementation method based on quantum natural benchmarks. Background technique [0002] Since the 20th century, the discovery of the Josephson effect and the quantized Hall effect has promoted the establishment of quantum voltage references and quantum resistance references, which can derive current units from Ohm's law, thereby realizing indirect quantum currents. However, people are looking for a more The effort of direct quantum current benchmark has never stopped {reference: Zhang Zhonghua, looking forward to the electromagnetic metrology in the 21st century [J]. Measurement and Control Technology, 2002, 21: 17-22}. Single-electron tunneling has been considered as an option for current reference devices, however, currents based on single-electron tunneling are within 10 -12 A level, can not be practical....

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Problems solved by technology

[0002] Since the 20th century, the discovery of the Josephson effect and the quantized Hall effect has promoted the establishment of quantum voltage references and quantum resistance references, which can derive current units from Ohm's law, thereby realizing indirect quantum currents. However, people are looking for a more The effort of direct quantum current benchmark has never stopped {reference: Zhang Zhonghua, looking forward to the electromagnetic metrology in the 21st century [J]. Measurement and Control Technology, 2002, 21: 17-22}

Single-electron tunneling has been considered as an option for current reference devices, however, currents based on single-electron tunneling are within 10 -12 A level, unable to be practical

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