TRIPLET SUPERCONDUCTORS: EXPLOITABLE BASIS FOR SCALEABLE QUANTUM COMPUTING
KENT S. WOOD, Huey-Daw Wu, Frank Golf, Hiroshi Yaguchi, Yoshiteru Maeno, ARMEN M. GULIAN · 2005
Triplet-pairing superconductors with broken time-reversal symmetry such as ruthenates, Sr2RuO4, have potential application as a basis for quantum computing (QC). The prerequisite here is the requirement of achieving superconductivity in single domain mesoscopic samples. One possible fabrication approach is application of thin film technologies. Initially some attempts were made by other groups to achieve epitaxial Sr2RuO4 films by pulsed laser deposition, but they failed. We propose an alternative method that makes small pieces of the material from larger crystals without destroying the crystal Meanwhile, experimental demonstration of quantum dynamics of triplet superconductors, such as Sr2RuO4, requires small structures on the order of the size of a single domain. QC done using triplet state superconductivity is potentially advantageous because the qubit is only a tiny piece of metal, yet a complete QC system can be implemented building upon this kind of qubit as the foundation. The supporting technology for initiation, entanglement and readout is described. Some of it involves application of ferromagnetic components, used in gate mechanisms. Ultimately, the approach presented here brings together triplet superconductivity in mesoscopic structures with ferromagnetic techniques.