Qubit Zoo

Demonstrating a Long-Coherence Dual-Rail Erasure Qubit Using Tunable Transmons

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Experimental dual-rail erasure qubit formed from two resonantly coupled tunable transmons. The logical eigenstates are symmetric and antisymmetric combinations in the single-excitation manifold; transmon loss leaves that manifold as a detectable erasure, while the hybridization suppresses residual dephasing.

Key Results

  • Millisecond-scale coherence within the qubit subspace
  • Erasure probability per single-qubit gate:
  • Residual errors approximately 40 times lower than erasures
  • Mid-circuit erasure check induced less than 0.1% dephasing per check

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