Infrared radiation shortens qubit coherence. HERD drains it; your signal passes untouched.
Used in published work at Yale · Princeton · PTB · EPFL · Chalmers
One filter for readout, charge, and flux lines alike.
On readout lines
<0.15 dB in-band: industry leading in-band performance, providing minimum loss between the QPU and the first amplifier.
On charge lines
Flat response with <0.1 dB ripple: preserves your pulse shapes and leaves the attenuation profile to your attenuators.
On flux lines
mA bias with low dissipation: allows for high bias currents while saving cooling power.
On every line
>60 dB stopband from 70 to 145 GHz and beyond: Cooper-pair-breaking radiation is drained before it reaches the QPU.
The measured outcome
Published setups using HERD reach sub-Hz quasiparticle tunneling rates, and provide coherence improvements in state-of-the-art QPUs.
Fully non-magnetic
Non-magnetic, cryo-compatible material choices: no added flux noise next to superconducting or spin qubits.
Room-temperature measurements up to 140 GHz.
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Preprints and peer-reviewed publications from research groups running HERD filters in operating quantum systems.
Gap-engineered transmons show reduced sensitivity to quasiparticle bursts, but substrate heating during an impact lets quasiparticles overcome the engineered gap. Relaxation recovers in ~0.7 ms, while chip heating persists for several milliseconds.
doi.org/10.48550/arXiv.2505.08104Two generations of ultra-low-loss IR-blocking filters for superconducting and spin qubits.
2nd generation · current
Non-magnetic inline filter with ultra-low in-band loss and a stopband from 70 GHz upward, measured to 145 GHz, reducing quasiparticle generation at the cold stage.
Quotes, integration questions, or custom connector configurations. Reach the team directly.
