passiveTier A
Attenuator
Reduce drive-line thermal noise and signal power. Thermalize coaxial line at each stage.
What it does
Fixed-value RF attenuator that reduces signal power and thermalizes microwave lines at each temperature stage. The resistive body absorbs the attenuated power and dissipates it locally, preventing thermal photons from propagating downward to the qubit.
Where it goes
- Allowed stages
- 50K, 4K, Still, CP, MXC
- Preferred stages
- 50K, 4K, Still, CP, MXC
- Typical line types
- xy, readoutIn
- Discouraged at 300K for in-fridge models; 300K attenuation belongs on instrument side.
Typical specifications
| Attenuation | 10 – 30 dB |
| Frequency range | DC – 18 GHz |
| Impedance | 50 Ω |
| Connectors | SMA male / female |
Ports
- RF Ininmicrowave, readout50 Ω
- RF Outoutmicrowave, readout50 Ω
Physical envelope
8.4 × 25.5 × 8.4 mm
Representative inline cryogenic SMA male/female attenuator envelope based on the common ~25 mm overall connectorized cryogenic attenuator class.