Background
HQubit is dedicated to improving qubit fidelity. During our research, we investigated the influence of quasiparticles originating from infrared and cosmic radiation. Through multiple experimental validations, the infrared filters developed by HQubit can significantly reduce the impact of radiation-induced noise on qubits (as verified by research groups).
Set up
We combine DC bias and RF signals at 10mK using a bias-tee before sending them to the chip. Infrared filters are used at both the common port of the bias tee and the readout line to effectively absorb infrared radiation. Furthermore, a cryogenic mu-metal shield is utilized on the sample port for shielding purposes. This combined solution can isolate infrared and magnetic radiation remarkably and is consistent with observations reported by other research groups.
Results
Based on the above findings, we believe that the shields and infrared filters are effective in blocking stray photons at frequencies around 100 GHz or higher from reaching the sample through free space and cables.
Solution
Scalable Interconnect Solutions For Superconducting Quantum Systems, Supporting High-Density Wiring, Stable Signal Transmission, And Advanced Quantum Hardware Integration.
Fidelity