Scalable flux controllers using adiabatic superconductor logic for quantum processors
Quantum processors have the potential to accelerate specific computing tasks but are difficult to scale up due to engineering limitations, such as the number of available cables and cooling power for dilution refrigerators for quantum bits (qubits). Hence, it is very important to develop scalable, e...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2023-02-01
|
| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.5.013145 |
| _version_ | 1797210491687272448 |
|---|---|
| author | Naoki Takeuchi Taiki Yamae Wenhui Luo Fuminori Hirayama Tsuyoshi Yamamoto Nobuyuki Yoshikawa |
| author_facet | Naoki Takeuchi Taiki Yamae Wenhui Luo Fuminori Hirayama Tsuyoshi Yamamoto Nobuyuki Yoshikawa |
| author_sort | Naoki Takeuchi |
| collection | DOAJ |
| description | Quantum processors have the potential to accelerate specific computing tasks but are difficult to scale up due to engineering limitations, such as the number of available cables and cooling power for dilution refrigerators for quantum bits (qubits). Hence, it is very important to develop scalable, energy-efficient interface circuits that can control many qubits via a few control lines inside a dilution refrigerator. One of the most important interface circuits is the flux controller (FC), which generates arbitrary dc flux bias to adjust the characteristics of component devices such as qubits. In this paper, we propose and demonstrate FCs using an energy-efficient superconductor logic family, adiabatic quantum-flux-parametron (AQFP) logic. We develop two types of FCs: the AQFP FC and the AQFP/single-flux-quantum (AQFP/SFQ) FC. Both FCs require only a few control lines and have extremely small power dissipation, thus exhibiting high scalability. Furthermore, the AQFP/SFQ FC can control flux bias using ballistic SFQ transmission, which is crucial for integration with qubits. As a proof of concept, we demonstrate AQFP and AQFP/SFQ FCs at 4.2 K, fabricated by the AIST high-speed standard process. Our results indicate that AQFP logic is highly suitable for use as qubit interface circuits for very large-scale quantum processors, especially from the viewpoint of the control line count, power dissipation, and amount of supply currents. |
| first_indexed | 2024-04-24T10:11:27Z |
| format | Article |
| id | doaj.art-1a61edde1ff4469087dd0eebd2956545 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:11:27Z |
| publishDate | 2023-02-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-1a61edde1ff4469087dd0eebd29565452024-04-12T17:28:52ZengAmerican Physical SocietyPhysical Review Research2643-15642023-02-015101314510.1103/PhysRevResearch.5.013145Scalable flux controllers using adiabatic superconductor logic for quantum processorsNaoki TakeuchiTaiki YamaeWenhui LuoFuminori HirayamaTsuyoshi YamamotoNobuyuki YoshikawaQuantum processors have the potential to accelerate specific computing tasks but are difficult to scale up due to engineering limitations, such as the number of available cables and cooling power for dilution refrigerators for quantum bits (qubits). Hence, it is very important to develop scalable, energy-efficient interface circuits that can control many qubits via a few control lines inside a dilution refrigerator. One of the most important interface circuits is the flux controller (FC), which generates arbitrary dc flux bias to adjust the characteristics of component devices such as qubits. In this paper, we propose and demonstrate FCs using an energy-efficient superconductor logic family, adiabatic quantum-flux-parametron (AQFP) logic. We develop two types of FCs: the AQFP FC and the AQFP/single-flux-quantum (AQFP/SFQ) FC. Both FCs require only a few control lines and have extremely small power dissipation, thus exhibiting high scalability. Furthermore, the AQFP/SFQ FC can control flux bias using ballistic SFQ transmission, which is crucial for integration with qubits. As a proof of concept, we demonstrate AQFP and AQFP/SFQ FCs at 4.2 K, fabricated by the AIST high-speed standard process. Our results indicate that AQFP logic is highly suitable for use as qubit interface circuits for very large-scale quantum processors, especially from the viewpoint of the control line count, power dissipation, and amount of supply currents.http://doi.org/10.1103/PhysRevResearch.5.013145 |
| spellingShingle | Naoki Takeuchi Taiki Yamae Wenhui Luo Fuminori Hirayama Tsuyoshi Yamamoto Nobuyuki Yoshikawa Scalable flux controllers using adiabatic superconductor logic for quantum processors Physical Review Research |
| title | Scalable flux controllers using adiabatic superconductor logic for quantum processors |
| title_full | Scalable flux controllers using adiabatic superconductor logic for quantum processors |
| title_fullStr | Scalable flux controllers using adiabatic superconductor logic for quantum processors |
| title_full_unstemmed | Scalable flux controllers using adiabatic superconductor logic for quantum processors |
| title_short | Scalable flux controllers using adiabatic superconductor logic for quantum processors |
| title_sort | scalable flux controllers using adiabatic superconductor logic for quantum processors |
| url | http://doi.org/10.1103/PhysRevResearch.5.013145 |
| work_keys_str_mv | AT naokitakeuchi scalablefluxcontrollersusingadiabaticsuperconductorlogicforquantumprocessors AT taikiyamae scalablefluxcontrollersusingadiabaticsuperconductorlogicforquantumprocessors AT wenhuiluo scalablefluxcontrollersusingadiabaticsuperconductorlogicforquantumprocessors AT fuminorihirayama scalablefluxcontrollersusingadiabaticsuperconductorlogicforquantumprocessors AT tsuyoshiyamamoto scalablefluxcontrollersusingadiabaticsuperconductorlogicforquantumprocessors AT nobuyukiyoshikawa scalablefluxcontrollersusingadiabaticsuperconductorlogicforquantumprocessors |