Qubit ZooDemonstrates a resonantly phase-matched Josephson traveling-wave parametric amplifier with more than 20 dB gain across 3 GHz. Weak-measurement calibration gave 75% intrinsic JTWPA quantum efficiency, while a projective qubit measurement reached 96.7% fidelity in 100 ns with power headroom consistent with multiplexing more than 20 qubits.
Key Results
- More than 20 dB power gain across a 3 GHz bandwidth
- 75% intrinsic JTWPA quantum efficiency; 70% including following-amplifier noise
- 96.7% projective qubit-readout fidelity in 100 ns
- Dynamic-range estimate supporting simultaneous readout of more than 20 qubits
Links
- Journal: Science