Sensitive radio-frequency read-out of quantum dots using an ultra-low-noise SQUID amplifier
Fault-tolerant spin-based quantum computers will require fast and accurate qubit readout. This can be achieved using radio-frequency reflectometry given sufficient sensitivity to the change in quantum capacitance associated with the qubit states. Here, we demonstrate a 23-fold improvement in capacit...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
AIP Publishing
2020
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| _version_ | 1797105368024743936 |
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| author | Schupp, FJ Vigneau, F Wen, Y Mavalankar, A Griffiths, J Jones, GAC Farrer, I Ritchie, DA Smith, CG Camenzind, LC Yu, L Zumbühl, DM Briggs, GAD Ares, N Laird, EA |
| author_facet | Schupp, FJ Vigneau, F Wen, Y Mavalankar, A Griffiths, J Jones, GAC Farrer, I Ritchie, DA Smith, CG Camenzind, LC Yu, L Zumbühl, DM Briggs, GAD Ares, N Laird, EA |
| author_sort | Schupp, FJ |
| collection | OXFORD |
| description | Fault-tolerant spin-based quantum computers will require fast and accurate qubit readout. This can be achieved using radio-frequency reflectometry given sufficient sensitivity to the change in quantum capacitance associated with the qubit states. Here, we demonstrate a 23-fold improvement in capacitance sensitivity by supplementing a cryogenic semiconductor amplifier with a SQUID preamplifier. The SQUID amplifier operates at a frequency near 200 MHz and achieves a noise temperature below 600 mK when integrated into a reflectometry circuit, which is within a factor 120 of the quantum limit. It enables a record sensitivity to capacitance of 0.07 aF/√Hz. The setup is used to acquire charge stability diagrams of a gate-defined double quantum dot in a short time with a signal-to-noise ration of about 38 in 1 µs of integration time. |
| first_indexed | 2024-03-07T06:46:31Z |
| format | Journal article |
| id | oxford-uuid:fb063d09-8fbf-4409-8572-a06ca38efe1c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:46:31Z |
| publishDate | 2020 |
| publisher | AIP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:fb063d09-8fbf-4409-8572-a06ca38efe1c2022-03-27T13:10:56ZSensitive radio-frequency read-out of quantum dots using an ultra-low-noise SQUID amplifierJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:fb063d09-8fbf-4409-8572-a06ca38efe1cEnglishSymplectic ElementsAIP Publishing2020Schupp, FJVigneau, FWen, YMavalankar, AGriffiths, JJones, GACFarrer, IRitchie, DASmith, CGCamenzind, LCYu, LZumbühl, DMBriggs, GADAres, NLaird, EAFault-tolerant spin-based quantum computers will require fast and accurate qubit readout. This can be achieved using radio-frequency reflectometry given sufficient sensitivity to the change in quantum capacitance associated with the qubit states. Here, we demonstrate a 23-fold improvement in capacitance sensitivity by supplementing a cryogenic semiconductor amplifier with a SQUID preamplifier. The SQUID amplifier operates at a frequency near 200 MHz and achieves a noise temperature below 600 mK when integrated into a reflectometry circuit, which is within a factor 120 of the quantum limit. It enables a record sensitivity to capacitance of 0.07 aF/√Hz. The setup is used to acquire charge stability diagrams of a gate-defined double quantum dot in a short time with a signal-to-noise ration of about 38 in 1 µs of integration time. |
| spellingShingle | Schupp, FJ Vigneau, F Wen, Y Mavalankar, A Griffiths, J Jones, GAC Farrer, I Ritchie, DA Smith, CG Camenzind, LC Yu, L Zumbühl, DM Briggs, GAD Ares, N Laird, EA Sensitive radio-frequency read-out of quantum dots using an ultra-low-noise SQUID amplifier |
| title | Sensitive radio-frequency read-out of quantum dots using an ultra-low-noise SQUID amplifier |
| title_full | Sensitive radio-frequency read-out of quantum dots using an ultra-low-noise SQUID amplifier |
| title_fullStr | Sensitive radio-frequency read-out of quantum dots using an ultra-low-noise SQUID amplifier |
| title_full_unstemmed | Sensitive radio-frequency read-out of quantum dots using an ultra-low-noise SQUID amplifier |
| title_short | Sensitive radio-frequency read-out of quantum dots using an ultra-low-noise SQUID amplifier |
| title_sort | sensitive radio frequency read out of quantum dots using an ultra low noise squid amplifier |
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