Description
Superconducting quantum processors have been established to explore quantum physics [1] and some made accessible to the general public [2]. However, their operation of this large-scale quantum processor prevents the users from full control (e.g. pulse-level control of the processors). Furthermore, their queuing system and charging plan [3] make it difficult to run experiment that requires long characterisation and fast iterations. Therefore, the National Quantum Computing Testbed (NQCT) facility has been devoted to developing Australian superconducting quantum processors to address these issues. As an initial step, we are developing the operation and robust fabrication of small-scale 5-qubit processors with high-quality qubits.
A core unit in our superconducting processor is high-coherence-time transmon qubit. In this talk, we will present how we manufacture transmon qubits by improving the fabrication and the electromagnetic circuit design. We focus on a circuit comprised of Niobium and Aluminium. We achieve a 0.5 millisecond relaxation time (T1) and 0.2 millisecond coherence time (T2).
[1] Google Quantum AI , “Magic state cultivation on a superconducting quantum processor”, arXiv:2512.13908.
[2] IBM Quantum Platform, https://quantum.cloud.ibm.com/.
[3] Accessing the product of IBM Q computer, https://www.ibm.com/quantum/products.
| I am the presenting author | Yes |
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