SQUID Amplifier Technology Landscape 2026 — PatSnap Eureka
SQUID Amplifier Technology Landscape 2026
Superconducting Quantum Interference Device amplifiers are becoming the preferred pump-free front-end for million-qubit readout chains. This dataset snapshot maps 70+ patent and literature records from 1997 to 2026.
SQUID Amplifiers: From Precision Sensing to Quantum-Scale Integration
SQUID amplifiers exploit flux quantization and Josephson junction nonlinearity to achieve noise temperatures approaching the quantum limit. A 2010 literature benchmark confirmed that lumped-element DC-SQUID amplifiers achieve noise temperatures below 1 K across the 4–8 GHz band, representing more than a factor-of-10 improvement over conventional HEMT-based systems.
Within this dataset, four principal sub-domains are identifiable: DC-SQUID microwave amplifiers for qubit readout; SQUID bias and readout circuits operating in flux-locked-loop or direct-readout mode; SQUID array signal generators and sensors including THz heterodyne receivers; and quantum-computing integration as tunable couplers and readout resonators within transmon-qubit chips.
The absence of a pump tone — cited explicitly in the 2022 and 2026 SIMIT amplifier patents — is cited as the critical differentiator versus Josephson Parametric Amplifiers and Traveling-Wave Parametric Amplifiers for systems targeting millions of qubits. Planar transmission-line impedance transformation networks enable gain exceeding 20 dB and noise temperatures approaching 90 mK at 1 GHz.
In this dataset, China accounts for more than 40 CN-jurisdiction patents among 70+ total records, with Japan contributing approximately 8 records and the US approximately 6. SIMIT holds approximately 20 records in this dataset, making it the most prolific single assignee in retrieved records by a wide margin.
Patent Activity by Technology Cluster and Filing Period
This dataset reveals four distinct technology clusters and a clear acceleration in filing activity after 2018, with the most recent records extending to 2026.
Records by Technology Cluster (Dataset Snapshot)
Bias, readout, and feedback circuits form the most patent-dense cluster in this dataset, followed by series SQUID array microwave amplifiers and nano-bridge/HTS fabrication approaches.
↗ Click bars to exploreFiling Activity by Era (Dataset Snapshot)
Filing activity in this dataset accelerated sharply in the 2018–2023 period, with the current 2024–2026 window already producing multiple high-profile records including the 2026 balanced DC-SQUID microwave amplifier.
↗ Click bars to exploreKey Application Areas for SQUID Amplifiers in This Dataset
SQUID amplifiers appear across four principal application domains in this dataset: superconducting qubit readout, biomedical magnetometry, radio astronomy and THz sensing, and broadband RF and voltage metrology.
Superconducting Qubit Readout Chains
SQUID microwave amplifiers serve as the first stage in transmon qubit readout chains, amplifying dispersive-shift signals before HEMT stages at 4 K. The 2022 and 2026 SIMIT amplifier patents explicitly cite elimination of the pump tone as critical for managing thermal budget in million-qubit systems. Supporting filings from Origin Quantum Computing Technology (Hefei) and Tsinghua University cover SQUID-based tunable couplers and qubit frequency modulation.
Quantum ComputingBiomedical Magnetometry (MEG/MCG)
Mandi Medical Instruments (Shanghai) filed SQUID access protection circuits (2015, 2017) specifically designed for clinical environments where power-cycling reliability is critical. A compact portable SQUID system with integrated readout-control circuits was filed by Shanghai Liwei Medical Technology Development in 2023, targeting magnetoencephalography and magnetocardiography deployments.
Medical SensingRadio Astronomy and THz Sensing
Purple Mountain Observatory (Chinese Academy of Sciences) filed multiple patents on quasi-optical superconducting hot-electron bolometer mixer arrays for THz astronomy, including a 2020 ultrawide-band 2×2 pixel receiver and a 2025 balanced THz HEB mixer with cross-slot antenna and NbN/NbTiN microbridge. SQUID amplifiers are positioned as the cryogenic low-noise amplifier stage immediately downstream of HEB mixers in these architectures.
Radio AstronomyBroadband RF and Voltage Metrology
Literature records document Superconducting Quantum Array active antennas achieving approximately 100 mV peak-to-peak linear output for broadband RF acquisition (2014 benchmark). NIM’s nano-bridge SQUID array filings (2020, 2025) are explicitly positioned for voltage metrology applications requiring wideband operation, and single-flux-quantum digital-to-analog converters with dual double-flux-quantum amplifiers are documented for precision voltage synthesis.
RF and MetrologyLeading Patent Assignees in SQUID Amplifiers — Dataset Snapshot
In this dataset, SIMIT (Chinese Academy of Sciences) accounts for approximately 20 of the 70+ retrieved records, spanning amplifier architectures, bias circuits, sensing assemblies, and EMC engineering. China National Institute of Metrology (NIM) holds approximately 5 records in retrieved records, concentrated in nano-bridge junction fabrication and voltage metrology.
Top Assignees by Filing Count in Retrieved Records (Dataset Snapshot)
↗ Click bars to exploreSIMIT, Chinese Academy of Sciences
SIMIT holds approximately 20 records in this dataset spanning filings from 2013 to 2026, making it the most prolific single assignee in retrieved records. Key patents include cryogenic series SQUID array microwave amplifiers (2024), a balanced DC-SQUID microwave amplifier (2026), SQUID bias amplifier circuits in constant-current and constant-voltage modes (2013–2015), EMC-shielded device structures (2020), and a high-temperature SQUID device for liquid-nitrogen operation (2025). All known filings are CN-jurisdiction.
China — CNChina National Institute of Metrology
China National Institute of Metrology (NIM) holds approximately 5 records in this dataset, concentrated between 2020 and 2025. Key patents include series SQUID arrays based on superconducting nano-bridge junctions (original 2020 filing and 2025 update), a self-feedback differential amplifier readout circuit (2023), and a current-locking SQUID with dual low-pass filters (2025). NIM’s filings are explicitly positioned for wideband voltage metrology applications. All known filings are CN-jurisdiction.
China — CNFive Emerging Directions in SQUID Amplifier Technology
The most recent records in this dataset — spanning 2024 to 2026 — signal five distinct emerging directions, from on-chip pump-free integration to quantum networking back-ends.
Pump-Free On-Chip SQUID Amplifiers for Million-Qubit Arrays
The 2026 SIMIT balanced DC-SQUID microwave amplifier patent explicitly positions SQUID amplifiers as candidates for on-chip integration with million-qubit arrays, citing elimination of local oscillator pump signals as the critical differentiator versus JPA and TWPA approaches. This represents a significant architectural shift from the current practice of rack-mounted cryogenic amplifiers. Key claims include gain exceeding 20 dB and noise temperatures approaching 90 mK at 1 GHz.
Switchable Feedback Polarity for Programmable SQUID Circuits
The 2024 Tsinghua University filing on a SQUID interference circuit includes a feedback polarity adjustment module switchable between positive and negative coupling, enabling programmable multi-scenario amplifier-sensor operation on a single chip. This functional flexibility is not present in earlier fixed-topology SQUID designs documented in this dataset. The filing is CN-jurisdiction and dated 2024.
DC-SQUID Microwave Amplifiers vs. Josephson Parametric Amplifiers
Click any row to explore further.
| Dimension | DC-SQUID Microwave Amplifier | Josephson Parametric Amplifier (JPA) |
|---|---|---|
| Pump Signal Required | No — pump-free operation cited in 2022 and 2026 SIMIT patents | Yes — requires external local oscillator pump tone |
| Noise Temperature | Approaching 90 mK at 1 GHz; below 1 K across 4–8 GHz (2010 benchmark) | Near quantum limit but requires careful pump power management |
| Gain | Exceeding 20 dB cited in series SQUID array amplifier patents | Typically 20 dB range, bandwidth limited by pump-signal detuning |
| Impedance Matching | Planar quarter-wave, high-low impedance, or tapered transmission-line networks at input and output | Matched via resonator design; narrowband by default |
| Scalability | On-chip integration for million-qubit arrays explicitly targeted in 2026 SIMIT patent | Wiring and pump-signal overhead scales poorly beyond ~1,000 qubits |
| Key Patent Assignees (This Dataset) | SIMIT (~20 records), NIM (~5 records), CSIRO (~5 records) | Not a primary focus of records in this dataset |
| Operating Temperature | Millikelvin (standard); 77 K for HTS variant (SIMIT 2025) | Millikelvin — requires dilution refrigerator environment |
| Junction Technology | Nb trilayer or nano-bridge junctions (NIM 2020, 2025) | Nb trilayer Josephson junctions in resonator geometry |
Frequently Asked Questions: SQUID Amplifier Patents and Technology
A 2010 literature benchmark in this dataset confirmed that lumped-element DC-SQUID amplifiers achieve noise temperatures below 1 K (approximately three added photons) across the 4–8 GHz band, representing more than a factor-of-10 improvement over conventional HEMT-based systems. More recent series SQUID array amplifier patents cite noise temperatures approaching 90 mK at 1 GHz.
The 2022 and 2026 SIMIT balanced DC-SQUID microwave amplifier patents explicitly cite the elimination of a local oscillator pump signal as the critical differentiator versus Josephson Parametric Amplifiers and Traveling-Wave Parametric Amplifiers. In systems targeting millions of qubits, removing the pump tone is cited as crucial for managing thermal budget and wiring complexity.
Shanghai Institute of Microsystems and Information Technology (SIMIT), Chinese Academy of Sciences, holds approximately 20 records in this dataset — the highest count among all assignees in retrieved records. SIMIT’s portfolio spans SQUID amplifier architectures, bias and readout circuits, EMC-shielded packaging, sensing assemblies, and high-temperature SQUID devices.
Nano-bridge junctions replace traditional trilayer Josephson junctions with nanometer-scale superconducting bridges to achieve higher critical current densities, lower parasitic capacitance, broader bandwidth, and improved resistance to external magnetic interference. China National Institute of Metrology (NIM) filed the original nano-bridge SQUID array patent in 2020 and updated it in 2025, targeting wideband voltage metrology applications.
China dominates filing volume in this dataset with more than 40 CN-jurisdiction patents among 70+ total records. Japan contributes approximately 8 records (including early filings from Mitsubishi Electric, Seiko Instruments, and Japan Science and Technology Agency). The US contributes approximately 6 records, and CSIRO holds 4–5 records across Israel and Singapore jurisdictions.
A flux-locked loop is a feedback circuit that linearizes SQUID output by continuously nulling the flux signal through a feedback coil, keeping the SQUID biased at its most sensitive operating point. This dataset’s Cluster 2 covers FLL and direct-readout front-ends including switchable constant-current/constant-voltage bias circuits from SIMIT (2013–2015), self-feedback differential amplifier readout from NIM (2023), and current-locking SQUID circuits with dual low-pass filters from NIM (2025).
Data and insights on this page are based on a limited patent and literature dataset and are for reference only. Figures may not represent the complete technology landscape.