Science Daily April 14, 2022
Topological qubits are considered to be particularly robust and largely immune to external sources of decoherence and appear to enable fast switching times comparable to those achieved by the conventional superconducting qubits used in current quantum processors. However, it is not yet clear whether we will ever succeed in producing topological qubits as a suitable material basis is still lacking to experimentally generate the special quasiparticles required for this without any doubt. An international team of researchers (Germany, UK, Denmark, the Netherlands) implemented superconducting transmon qubits with (Bi0.06Sb0.94)2Te3 topological insulator. According to the team microwave losses on their substrates, which host monolithically integrated hard masks used for the selective area growth of TI nanostructures, implied microsecond limits to relaxation times and, thus, their compatibility with strong coupling cQED. They used the cavity–qubit interaction to show that the Josephson energy of TI-based transmons scales with their Josephson Junctions dimensions and demonstrated qubit control as well as temporal quantum coherence. Their results pave the way for advanced investigations of topological materials in in both novel Josephson and topological qubits…read more. TECHNICAL ARTICLEÂ
Graphical abstract. Credit: Nano Lett. 2022, 22, 7, 2595–2602, March 2, 2022Â