biostudies-literatureUnknown7(40)Mikheev ESuperconductivity in SrTiO₃ occurs at remarkably low carrier densities and therefore, unlike conventional superconductors, can be controlled by electrostatic gates. Here, we demonstrate nanoscale weak links connecting superconducting leads, all within a single material, SrTiO₃. Ionic liquid gating accumulates carriers in the leads, and local electrostatic gates are tuned to open the weak link. These devices behave as superconducting quantum point contacts with a quantized critical supercurrent. This is a milestone toward establishing SrTiO₃ as a single-material platform for mesoscopic superconducting transport experiments that also intrinsically contains the necessary ingredients to engineer topological superconductivity.Science advanceseabi6520https://www.ebi.ac.uk/biostudies/studies/S-EPMC10938545biostudies-literatureQuantized critical supercurrent in SrTiO₃-based quantum point contacts.PMC10938545Mikheev EGoldhaber-Gordon DRosen ITfalseQuantized critical supercurrent in SrTiO₃-based quantum point contacts.Superconductivity in SrTiO₃ occurs at remarkably low carrier densities and therefore, unlike conventional superconductors, can be controlled by electrostatic gates. Here, we demonstrate nanoscale weak links connecting superconducting leads, all within a single material, SrTiO₃. Ionic liquid gating accumulates carriers in the leads, and local electrostatic gates are tuned to open the weak link. These devices behave as superconducting quantum point contacts with a quantized critical supercurrent. This is a milestone toward establishing SrTiO₃ as a single-material platform for mesoscopic superconducting transport experiments that also intrinsically contains the necessary ingredients to engineer topological superconductivity.2021-01-01T00:00:00Z2021 Oct2026-07-05T03:13:38.965Z2026-07-05T03:12:07.022ZS-EPMC109385453459714110.1126/sciadv.abi6520