Qubit ZooIntroduces and experimentally demonstrates the merged-element transmon (mergemon): a superconducting qubit in which the Josephson junction’s self-capacitance replaces the dominant external shunt capacitor. The proof-of-principle Nb/amorphous-Si/Nb device achieved an approximately 100-fold footprint reduction, showed dispersive readout plus single- and multiphoton transitions, and identified dielectric loss in the amorphous-Si barrier and its interfaces as the dominant relaxation channel.
Key Results
- Junction self-capacitance provides required C for transmon regime
- ~100× reduction in qubit footprint vs. standard transmon
- Qubit-state-dependent readout demonstrated at 10 mK
- Amorphous barrier dielectric loss identified as coherence limiter
Links
- Journal: Physical Review Applied
- arXiv: 2008.07652