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A superconducting transistor could give quantum-computer designers a way to control a Josephson junction with voltage. The most relevant device is the Josephson field-effect transistor, or JoFET: a gated junction that may serve as a tunable element in a qubit circuit or as part of the cryogenic electronics that control and read qubits. These are developing research directions, not a standard, widely deployed quantum-computing platform.
What is a superconducting transistor?
In this context, “superconducting transistor” usually refers to a Josephson field-effect transistor (JoFET), not an ordinary silicon transistor operating at room temperature. A JoFET has superconducting contacts separated by a semiconductor channel. Applying voltage to a gate can alter how readily superconducting current flows through the junction, changing its electrical response. Imperial College London describes this gated-junction approach as a way to control Josephson behavior with an electric field: Quantum Josephson Field-Effect Transistors (Jo-FETs).
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The distinction matters because Josephson junctions are already important in superconducting quantum circuits. A conventional junction provides nonlinearity: it helps create an uneven set of microwave energy transitions so a circuit can be operated as a qubit. A JoFET modifies that familiar building block by adding a possible local gate-voltage control. It is an alternative or complement to tuning methods based on current or magnetic flux, not a wholesale replacement for the rest of a quantum computer.
How could a JoFET help a quantum computer?
Voltage-tune a quantum-circuit element
A gated Josephson junction could let a designer adjust the junction response electrically. This makes local voltage control a possible tool for tuning a superconducting circuit’s properties. A related example is the gatemon: a superconducting qubit whose Josephson junction uses semiconductor material and can be tuned by voltage. The University of Copenhagen discusses this semiconductor-based approach and its potential compatibility with CMOS control techniques: Superconducting Qubits. A gatemon is a kind of voltage-tunable superconducting qubit; the term does not mean that every gatemon is called a transistor, or that all superconducting qubits use gated junctions.
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Move some control and readout closer to the processor
A JoFET’s potential role is not limited to becoming part of a qubit. Cryogenic electronics near a processor could help generate, route, amplify, or read the microwave signals used to operate qubits. Integrating more of this circuitry close to the quantum chip is one proposed way to address the wiring and power challenges associated with control and readout.
The European Commission’s SuperICQ project describes planned integrated-circuit modules that include quantum-limited parametric amplifiers, on-chip filters, microwave bolometers, voltage-tunable resonators, and multiplexed qubit control/readout. The project’s objective is to validate JoFET circuits for control and readout and demonstrate a route toward low-power, scalable interfacing; those are goals, not evidence of commercial-scale deployment. See the SuperICQ project fact sheet.
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The separate JOGATE project describes cryogenic microwave signal-management prototypes, including a radiofrequency switch and an integrated superconducting qubit-control chip. Those examples concern electronics around a quantum processor rather than proof that JoFETs already form its qubits. The project’s scope is summarized in the JOGATE fact sheet. NIST’s Superconductive Electronics Group provides broader context for research into Josephson-junction circuits for computing, RF communications, calibration, and cryogenic applications.
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No. A JoFET could be used as a quantum-circuit element, but a transistor or junction circuit can also perform ordinary control and signal-processing tasks in the classical electronics that support qubits. Those roles should not be confused.
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There is another distinct use of Josephson junctions: single-flux-quantum (SFQ) logic. In SFQ circuits, junctions switch pulses to carry out digital operations. That is superconducting classical computing, not quantum computation with qubits. NIST says SFQ circuits could support clock rates well above 100 GHz with low dissipation, while presenting their competitiveness as potential and conditional on resolving component issues—not as a JoFET quantum-computer benchmark. See NIST’s Flux Quantum Electronics overview.
JoFET, conventional junction, or gatemon: what is the difference?
| Approach | Control or role | What the cited evidence establishes |
|---|---|---|
| Conventional Josephson junction | A nonlinear element in a superconducting circuit; circuit properties can be controlled using approaches such as current or magnetic flux. | Josephson-junction nonlinearity is an established part of common superconducting-qubit designs. See Imperial College London. |
| JoFET | A gated Josephson junction intended to enable electric-field, or gate-voltage, control; it may be a circuit element or part of cryogenic control/readout hardware. | Research and publicly funded project work describe development, validation aims, and prototypes. These sources do not establish a generally deployed JoFET quantum-computing platform. See SuperICQ and JOGATE. |
| Gatemon | A superconducting qubit with a semiconductor Josephson junction that can be tuned by voltage. | The University of Copenhagen describes the device concept and its potential connection to CMOS-based control; the cited source does not provide a head-to-head performance comparison with the other approaches. See Superconducting Qubits. |
The comparison is conceptual. The cited material does not establish a common, head-to-head measurement of coherence, gate performance, power consumption, or scaling across these approaches.
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What are the potential benefits—and what remains unproven?
- Local voltage control: A gate could provide another way to tune a junction, potentially making circuit adjustment more direct in some designs.
- More integrated cryogenic electronics: Projects are exploring amplifiers, switches, filters, resonators, and multiplexed control/readout modules intended to reduce the burden of interfacing with qubits.
- Potentially lower-power operation: Low power and scalability are stated project aims. The available project descriptions do not establish a measured system-level energy saving for a JoFET-based quantum computer.
- Open engineering questions: The cited material does not provide a comparative benchmark showing that JoFET hardware outperforms an established control stack, or that it has solved the broader challenges of scaling a quantum processor.
For now, the careful conclusion is that JoFETs and related gated-junction devices are promising research directions for voltage-tunable quantum circuits and cryogenic support electronics. Prototype work and project objectives show what teams are investigating; they do not show that the technology is already standard or widely available.
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