Low-noise SQUIDs with large transfer: two-stage SQUIDs based on DROSs

M. Podt; Jakob Flokstra; Horst Rogalla

doi:10.1016/S0921-4534(02)00676-7

Low-noise SQUIDs with large transfer: two-stage SQUIDs based on DROSs

M. Podt, Jakob Flokstra, Horst Rogalla

Faculty of Science and Technology

Research output: Contribution to journal › Article › Academic

5 Citations (Scopus)

Abstract

We have realized a two-stage integrated superconducting quantum interference device (SQUID) system with a closed loop bandwidth of 2.5 MHz, operated in a direct voltage readout mode. The corresponding flux slew rate was 1.3×105 Φ0/s and the measured white flux noise was 1.3 μΦ0/√Hz at 4.2 K. The system is based on a conventional dc SQUID with a double relaxation oscillation SQUID (DROS) as the second stage. Because of the large flux-to-voltage transfer, the sensitivity of the system is completely determined by the sensor SQUID and not by the DROS or the room-temperature preamplifier. Decreasing the Josephson junction area enables a further improvement of the sensitivity of the two-stage SQUID systems.

Original language	Undefined
Pages (from-to)	225-228
Journal	Physica C
Volume	372-37
Issue number	Part 1
DOIs	https://doi.org/10.1016/S0921-4534(02)00676-7
Publication status	Published - 2002

Keywords

SQUID
Two-stage system
IR-74718
Superconducting device

Access to Document

10.1016/S0921-4534(02)00676-7

Cite this

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title = "Low-noise SQUIDs with large transfer: two-stage SQUIDs based on DROSs",

abstract = "We have realized a two-stage integrated superconducting quantum interference device (SQUID) system with a closed loop bandwidth of 2.5 MHz, operated in a direct voltage readout mode. The corresponding flux slew rate was 1.3×105 Φ0/s and the measured white flux noise was 1.3 μΦ0/√Hz at 4.2 K. The system is based on a conventional dc SQUID with a double relaxation oscillation SQUID (DROS) as the second stage. Because of the large flux-to-voltage transfer, the sensitivity of the system is completely determined by the sensor SQUID and not by the DROS or the room-temperature preamplifier. Decreasing the Josephson junction area enables a further improvement of the sensitivity of the two-stage SQUID systems.",

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author = "M. Podt and Jakob Flokstra and Horst Rogalla",

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TY - JOUR

T1 - Low-noise SQUIDs with large transfer: two-stage SQUIDs based on DROSs

AU - Podt, M.

AU - Flokstra, Jakob

AU - Rogalla, Horst

PY - 2002

Y1 - 2002

N2 - We have realized a two-stage integrated superconducting quantum interference device (SQUID) system with a closed loop bandwidth of 2.5 MHz, operated in a direct voltage readout mode. The corresponding flux slew rate was 1.3×105 Φ0/s and the measured white flux noise was 1.3 μΦ0/√Hz at 4.2 K. The system is based on a conventional dc SQUID with a double relaxation oscillation SQUID (DROS) as the second stage. Because of the large flux-to-voltage transfer, the sensitivity of the system is completely determined by the sensor SQUID and not by the DROS or the room-temperature preamplifier. Decreasing the Josephson junction area enables a further improvement of the sensitivity of the two-stage SQUID systems.

AB - We have realized a two-stage integrated superconducting quantum interference device (SQUID) system with a closed loop bandwidth of 2.5 MHz, operated in a direct voltage readout mode. The corresponding flux slew rate was 1.3×105 Φ0/s and the measured white flux noise was 1.3 μΦ0/√Hz at 4.2 K. The system is based on a conventional dc SQUID with a double relaxation oscillation SQUID (DROS) as the second stage. Because of the large flux-to-voltage transfer, the sensitivity of the system is completely determined by the sensor SQUID and not by the DROS or the room-temperature preamplifier. Decreasing the Josephson junction area enables a further improvement of the sensitivity of the two-stage SQUID systems.

KW - SQUID

KW - Two-stage system

KW - IR-74718

KW - Superconducting device

U2 - 10.1016/S0921-4534(02)00676-7

DO - 10.1016/S0921-4534(02)00676-7

M3 - Article

SN - 0921-4534

VL - 372-37

SP - 225

EP - 228

JO - Physica C

JF - Physica C

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