Approaches to Improving Transmon Qubits
Abstract
Progress (1) We have completed fabrication at JHU/APL of a variety of microwave resonator cavities. The devices have been diced and are ready for use. We have: a. Sapphire substrate, aluminum lift-off b. Sapphire substrate, niobium lift-off c. <110> silicon substrate, aluminum lift-off d. <110> silicon substrate, niobium lift-off (2) The machine shop finished fabrication of our specially-designed evaporator jig to allow double-angle evaporation (to form the transmon with a single e-beam step). (3) We have made arrangements to use an e-beam lithography system on the JHU campus and one of us has finished training on the machine. We are now allowed full access to the system. (4) We have completed simulations of the trench shunt capacitors and have started the design process for the first round of fabrication. (5) We have received the quartz substrates and thus can start the trench etching process. Planned activities: (1) Complete Princeton subcontract -- we have now enumerated all contractual issues and hope to resolve them shortly. (2) Ship a selection of microwave resonator cavities to Princeton for measurement of Q values. (3) If Q values of resonators are sufficient, start e-beam lithography of transmons at both Princeton and JHU. (4) Fabrication resonator cavities in aluminum and niobium on quartz substrates.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 15, 2009
- Accession Number
- ADA511245
Entities
People
- Bryan Jacobs
Organizations
- Johns Hopkins University