Transmon qutrits serve as erasure qubits achieving logical T1 over 500 μs with mid-circuit detection, ten times the physical qubit lifetime, plus low-error gates and heralded Bell states.
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Symmetrically coupled dispersive readout achieves 384 ns single-shot erasure detection on dual-rail qubits with 6.0(2)×10^{-4} residual error per check and enables parallel erasure checks during single-qubit gates with median 7.2×10^{-5} error per gate.
Lighter fluxonium qubits show lower susceptibility to measurement-induced state transitions than heavier counterparts due to reduced multi-photon resonance density, smaller required coupling, and more harmonic charge operator structure.
citing papers explorer
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Hardware-Efficient Erasure Qubits With Superconducting Transmon Qutrits
Transmon qutrits serve as erasure qubits achieving logical T1 over 500 μs with mid-circuit detection, ten times the physical qubit lifetime, plus low-error gates and heralded Bell states.
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Fast, High-Fidelity Erasure Detection of Dual-Rail Qubits with Symmetrically Coupled Readout
Symmetrically coupled dispersive readout achieves 384 ns single-shot erasure detection on dual-rail qubits with 6.0(2)×10^{-4} residual error per check and enables parallel erasure checks during single-qubit gates with median 7.2×10^{-5} error per gate.
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Measurement-induced state transitions across the fluxonium qubit landscape
Lighter fluxonium qubits show lower susceptibility to measurement-induced state transitions than heavier counterparts due to reduced multi-photon resonance density, smaller required coupling, and more harmonic charge operator structure.