Publication date: 15th December 2025
Ionizing radiation events are a relevant limiting factor of superconducting qubit performance. While the coherence time (T1) of the best superconducting qubits is not yet limited by ionizing radiation, recent studies have already pointed towards degradation of stability and performance caused by particle interactions within a quantum processor. In particular, qubit correlated errors caused by ionizing radiation are threatening to render useless the envisioned quantum error correction techniques. Moreover, ionizing radiation would start directly limiting T1 around the 4 milliseconds mark, a near-future target.
Simultaneously, the high sensitivity of superconducting qubits to particle interactions can be exploited to build a new generation of particle detectors, enabling quantum sensing.
The first step to tackle the challenges posed by ionizing radiation is to fully understand how the energy released in the quantum processor deteriorates its performance. To do so, we build hybrid devices equipped with superconducting qubits and particle sensors used in low-temperature particle detectors. These new hybrid detectors can give us invaluable information regarding the disruption of the qubit coherence due to ionizing radiation interacting within the device.
At the same time, the high sensitivity to particle interactions of these hybrid devices can be exploited to build new detector prototypes which can find useful applications in other areas of physics, such as astroparticle physics.
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