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High-frequency readout free from transmon multi-excitation resonances
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High-frequency readout free from transmon multi-excitation resonances
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Quantum computation will rely on quantum error correction to counteract decoherence. Successfully implementing an error correction protocol requires the fidelity of qubit operations to be well-above error correction thresholds. In superconducting quantum computers, measurement of the qubit state remains the lowest-fidelity operation. For the transmon, a prototypical superconducting qubit, measurement is carried out by scattering a microwave tone off the qubit. Conventionally, the frequency of this tone is of the same order as the transmon frequency. The measurement fidelity in this approach is limited by multi-excitation resonances in the transmon spectrum which are activated at high readout power. These resonances excite the qubit outside of the computational basis, violating the desired quantum non-demolition character of the measurement. Here, we find that strongly detuning the readout frequency from that of the transmon exponentially suppresses the strength of spurious multi-excitation resonances. By increasing the readout frequency up to twelve times the transmon frequency, we achieve a quantum non-demolition measurement fidelity of 99.93% with a residual probability of leakage to non-computational states of only 0.02%.
Forward citations
Cited by 7 Pith papers
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Coherent control of spinmons
Proposes spinmon qubits that entangle transmon states with Andreev quasiparticle spins for coherent control and noise robustness in superconducting systems.
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Experimental Characterization and Modeling of Measurement-Induced State-Transitions in a Fluxonium Superconducting Qubit
Experimental mapping of measurement-induced state transitions in a fluxonium qubit validates numerical models predicting eleven high-error flux regions, including effects from superinductor array modes.
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Readout-Induced Leakage in Superconducting Circuits with Nonlinear Couplings
Native nonlinear qubit-readout couplings alone neither eliminate nor reliably suppress readout-induced leakage; auxiliary modes reintroduce multiphoton channels whose rates vary by orders of magnitude over <7% frequen...
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Coherent control of spinmons
Spinmons are introduced as qubits from transmon-Andreev spin entanglement, with coherent control via Zeeman splitting, gates, and flux drive, showing robustness to flux and charge noise.
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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 wit...
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Probing excited-state dynamics of transmon ionization
Experimental verification that transmon ionization under strong readout drives is a controllable Landau-Zener transition, with quantitative measurements of critical photon numbers and population transfer matching a se...
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High-Coherence and High-frequency Quantum Computing: The Design of a High-Frequency, High-Coherence and Scalable Quantum Computing Architecture
The paper proposes an 8-qubit transmon design at 12 GHz targeting 1.9 ms relaxation times and quality factors of 2.75e7 via tantalum and Nb/Al/AlOx fabrication on silicon.
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