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White-noise Properties of YBa2Cu3O7-δ Grain-boundary dc Superconducting Quantum Interference Devices
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We have studied white (high-frequency)-noise properties of YBa2Cu3O7-δ grain-boundary dc superconducting quantum interference devices (SQUIDs). Bias voltage (V) dependence of the white-noise voltage spectral density (S
v) was measured for dc-SQUIDs and junctions. As a result, S
v at low bias voltage can be explained by the thermal noise theory of tunnel junctions. Furthermore, the energy resolution of 1.96×10-32 J/Hz is obtained at 43 K in the white-noise region. The measured energy resolution of the dc-SQUIDs is in good agreement with the theoretical results. According to the above results, YBa2Cu3O7-δ dc-SQUIDs with a quantum noise limit might be realized at 4.2 K.
Title: White-noise Properties of YBa2Cu3O7-δ Grain-boundary dc Superconducting Quantum Interference Devices
Description:
We have studied white (high-frequency)-noise properties of YBa2Cu3O7-δ grain-boundary dc superconducting quantum interference devices (SQUIDs).
Bias voltage (V) dependence of the white-noise voltage spectral density (S
v) was measured for dc-SQUIDs and junctions.
As a result, S
v at low bias voltage can be explained by the thermal noise theory of tunnel junctions.
Furthermore, the energy resolution of 1.
96×10-32 J/Hz is obtained at 43 K in the white-noise region.
The measured energy resolution of the dc-SQUIDs is in good agreement with the theoretical results.
According to the above results, YBa2Cu3O7-δ dc-SQUIDs with a quantum noise limit might be realized at 4.
2 K.
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