Qubit ZooDemonstrates the Josephson traveling-wave parametric amplifier (JTWPA): a broadband (~4 GHz), near-quantum-limited microwave amplifier using a chain of ~2000 Josephson junctions. Achieves 20 dB gain with noise performance within a factor of 2 of the quantum limit across the full bandwidth. Enables frequency-multiplexed readout of multiple superconducting qubits — a key requirement for scaling quantum processors.
Key Results
- 4 GHz instantaneous bandwidth (vs ~10 MHz for JPA)
- 20 dB gain, near-quantum-limited noise
- ~2000 Josephson junctions in series
- Enables multiplexed qubit readout for scaling
- Phase-matched four-wave mixing with resonant phase matching
Links
- Journal: Science
- arXiv: 1507.06672