Quantum

Active isolation of transmon readout with a tunable inductive bridge

Read full article at source ↗

Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 21/10/2026, 04:13:25 UTC.

Briefings

A tunable inductive bridge integrated into a transmon qubit readout chain suppresses thermal noise-induced dephasing by over 30 dB. This chip-scale device replaces traditional ferrite isolators, enabling scalable quantum computation without compromising qubit coherence. The study uses broadband noise injection to validate the bridge's performance against thermal photon simulation.

Key points

• A tunable inductive bridge suppresses qubit dephasing by more than 30 dB when injecting broadband noise mimicking amplifier thermal photons.
• Flux-pulsing the bridge during readout did not degrade qubit coherence, residual excited-state population, or readout fidelity metrics.

Context

Scalable superconducting quantum computation requires fast, high-fidelity readout. Current dispersive readout schemes use cryogenic amplifiers that generate thermal noise, necessitating ferrite-based isolators. This new chip-scale bridge offers a potential integrated replacement for these isolators.

Limitations

The study relies on broadband noise injection to validate performance against thermal photon simulation. No independent on-off ratio measurements were provided for the bridge, and the device operates at a fixed frequency without testing under varying flux conditions.

Generated by Bittrees-hosted qwen35-2b sha256:aaf42c8b7c3c on 21/10/2026, 04:26:56 UTC. Based on publisher-provided feed evidence; may not cover the full original article. Check the source for details.

View archived briefing on IPFS
bafybeidilwn6kyimw4tel57oj7sjcehaczhtregznpfaoac3l7gval5smy