Qubit ZooFirst experimental demonstration of the merged-element transmon (mergemon): a superconducting qubit where the Josephson junction’s self-capacitance replaces the external shunt capacitor. Achieves ~100× footprint reduction and concentrates >90% of electromagnetic energy in the tunnel barrier, away from lossy surface interfaces. Analyzes loss mechanisms and establishes that dielectric loss of the tunnel barrier is the primary limiter.
Key Results
- Junction self-capacitance provides required C for transmon regime
- ~100× reduction in qubit footprint vs. standard transmon
-
90% electromagnetic energy confinement in barrier
- Qubit-state-dependent readout demonstrated at 10 mK
- Amorphous barrier dielectric loss identified as coherence limiter
Links
- Journal: Physical Review Applied