Wireless Josephson parametric amplifier above 20 GHz
arXiv:2508.11137 · doi:10.1063/5.0300910
Abstract
Operating superconducting qubits at elevated temperatures offers increased cooling power and thus system scalability, but requires suppression of thermal photons to preserve coherence and readout fidelity. This motivates migration to higher operation frequencies, which demands high-frequency amplification with near-quantum-limited noise characteristics for qubit readout. Here, we report the design and experimental realization of a wireless Josephson parametric amplifier (WJPA) operating above 20~GHz. The wireless design eliminates losses and impedance mismatches that become problematic at high frequencies. The WJPA achieves more than 20~dB of gain across a tunable frequency range of 21--23.5~GHz, with a typical dynamic bandwidth of 3~MHz. Through Y-factor measurements and a qubit-based photon number calibration, we show that the amplifier exhibits an added noise of approximately two photons.
main text: 5 pages, 3 figures. supplementary: 3 pages, 3 figures. final version - corrected typo in the supplementary
References in corpus (27)
- A Quantum Engineer's Guide to Superconducting Qubits
- Quantum error correction below the surface code threshold
- Black-box superconducting circuit quantization
- Rapid high-fidelity multiplexed readout of superconducting qubits
- Fast and Unconditional All-Microwave Reset of a Superconducting Qubit
- Quantum state tomography of an itinerant squeezed microwave field
- Heralded state preparation in a superconducting qubit
- Introduction to Quantum-limited Parametric Amplification of Quantum Signals with Josephson Circuits
- Optimizing the nonlinearity and dissipation of a SNAIL Parametric Amplifier for dynamic range
- Circuit Quantum Electrodynamics of Granular Aluminum Resonators
- Controlling the dynamic range of a Josephson parametric amplifier
- RF bifurcation of a Josephson junction: microwave embedding circuit requirements
- General method for extracting the quantum efficiency of dispersive qubit readout in circuit QED
- A near-ideal degenerate parametric amplifier
- Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic Control of the Dispersive Shift: Experiment and Theory
- Understanding the saturation power of Josephson Parametric Amplifiers made from SQUIDs arrays
- Nonlinearity and wideband parametric amplification in an NbTiN microstrip transmission line
- Synthesis of parametrically-coupled networks
- Readout of a quantum processor with high dynamic range Josephson parametric amplifiers
- Millimeter-Wave Four-Wave Mixing via Kinetic Inductance for Quantum Devices
- Fast multiplexed superconducting qubit readout with intrinsic Purcell filtering
- Benchmarking the readout of a superconducting qubit for repeated measurements
- Wireless Josephson Amplifier
- Granular Aluminum Parametric Amplifier for Low-Noise Measurements in Tesla Fields
- Measurement-induced state transitions in dispersive qubit readout schemes
- Low-loss Millimeter-wave Resonators with an Improved Coupling Structure
- Operation of a high-frequency, phase-slip qubit