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Cross-correlation noise measurements of a graphene-based SQUID magnetometer

Research output: Contribution to Journal/Magazine › Meeting abstract

Published

Standard

Cross-correlation noise measurements of a graphene-based SQUID magnetometer. / Prance, Jonathan; Thompson, Michael; Haley, Richard et al.
In: APS March Meeting 2019, 2019.

Research output: Contribution to Journal/Magazine › Meeting abstract

Harvard

Prance, J, Thompson, M, Haley, R, Pashkin, Y, Ben Shalom, M, Falko, V, van der Vliet, H, Matthews, A & Melhem, Z 2019, 'Cross-correlation noise measurements of a graphene-based SQUID magnetometer', APS March Meeting 2019. <http://adsabs.harvard.edu/abs/2019APS..MARL26003P>

APA

Prance, J., Thompson, M., Haley, R., Pashkin, Y., Ben Shalom, M., Falko, V., van der Vliet, H., Matthews, A., & Melhem, Z. (2019). Cross-correlation noise measurements of a graphene-based SQUID magnetometer. APS March Meeting 2019. http://adsabs.harvard.edu/abs/2019APS..MARL26003P

Vancouver

Prance J, Thompson M, Haley R, Pashkin Y, Ben Shalom M, Falko V et al. Cross-correlation noise measurements of a graphene-based SQUID magnetometer. APS March Meeting 2019. 2019.

Author

Prance, Jonathan ; Thompson, Michael ; Haley, Richard et al. / Cross-correlation noise measurements of a graphene-based SQUID magnetometer. In: APS March Meeting 2019. 2019.

Bibtex

@article{21f3feff256f44c4a53c559e18bf7402,
title = "Cross-correlation noise measurements of a graphene-based SQUID magnetometer",
abstract = "Lateral superconductor/graphene structures can be used to make Josephson junctions with low contact resistances and gate-tuneable critical currents. These junctions have the potential to provide new functionality for superconducting devices. For most devices, e.g. transmon qubits and SQUID sensors, it is important to quantify the intrinsic noise of the junctions. The voltage noise of low resistance junctions is typically below the noise floor of room temperature amplifiers. By cross-correlating the signals from two parallel amplifiers, we can detect signals down to 100 pV/√Hz, well below the noise floor of each amplifier. Using this technique, we characterise the voltage noise of a NbTi DC SQUID with graphene junctions in a frequency range from Hz to kHz. Combined with measurements of the SQUID's gain, we map its sensitivity across a range of operating conditions and find that the best-case sensitivity of the device is similar to traditional low temperature SQUIDs with oxide tunnel junctions. This project has received funding from the European Union's Horizon 2020 research and innovation programme under Grant agreement No 785219.",
author = "Jonathan Prance and Michael Thompson and Richard Haley and Yuri Pashkin and {Ben Shalom}, Moshe and Vladimir Falko and {van der Vliet}, Harriet and Anthony Matthews and Ziad Melhem",
year = "2019",
language = "English",
journal = "APS March Meeting 2019",

}

RIS

TY - JOUR

T1 - Cross-correlation noise measurements of a graphene-based SQUID magnetometer

AU - Prance, Jonathan

AU - Thompson, Michael

AU - Haley, Richard

AU - Pashkin, Yuri

AU - Ben Shalom, Moshe

AU - Falko, Vladimir

AU - van der Vliet, Harriet

AU - Matthews, Anthony

AU - Melhem, Ziad

PY - 2019

Y1 - 2019

N2 - Lateral superconductor/graphene structures can be used to make Josephson junctions with low contact resistances and gate-tuneable critical currents. These junctions have the potential to provide new functionality for superconducting devices. For most devices, e.g. transmon qubits and SQUID sensors, it is important to quantify the intrinsic noise of the junctions. The voltage noise of low resistance junctions is typically below the noise floor of room temperature amplifiers. By cross-correlating the signals from two parallel amplifiers, we can detect signals down to 100 pV/√Hz, well below the noise floor of each amplifier. Using this technique, we characterise the voltage noise of a NbTi DC SQUID with graphene junctions in a frequency range from Hz to kHz. Combined with measurements of the SQUID's gain, we map its sensitivity across a range of operating conditions and find that the best-case sensitivity of the device is similar to traditional low temperature SQUIDs with oxide tunnel junctions. This project has received funding from the European Union's Horizon 2020 research and innovation programme under Grant agreement No 785219.

AB - Lateral superconductor/graphene structures can be used to make Josephson junctions with low contact resistances and gate-tuneable critical currents. These junctions have the potential to provide new functionality for superconducting devices. For most devices, e.g. transmon qubits and SQUID sensors, it is important to quantify the intrinsic noise of the junctions. The voltage noise of low resistance junctions is typically below the noise floor of room temperature amplifiers. By cross-correlating the signals from two parallel amplifiers, we can detect signals down to 100 pV/√Hz, well below the noise floor of each amplifier. Using this technique, we characterise the voltage noise of a NbTi DC SQUID with graphene junctions in a frequency range from Hz to kHz. Combined with measurements of the SQUID's gain, we map its sensitivity across a range of operating conditions and find that the best-case sensitivity of the device is similar to traditional low temperature SQUIDs with oxide tunnel junctions. This project has received funding from the European Union's Horizon 2020 research and innovation programme under Grant agreement No 785219.

M3 - Meeting abstract

JO - APS March Meeting 2019

JF - APS March Meeting 2019

ER -