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Full characterization of measurement-induced transitions of a superconducting qubit
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Full characterization of measurement-induced transitions of a superconducting qubit
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Repeated quantum non-demolition measurement is a cornerstone of quantum error correction protocols. In superconducting qubits, the speed of dispersive state readout can be enhanced by increasing the power of the readout tone. However, such an increase has been found to result in additional qubit state transitions that violate the desired quantum non-demolition character of the measurement. Recently, the readout of a transmon superconducting qubit was improved by using a tone with frequency much larger than the qubit frequency. Here, we experimentally identify the mechanisms of readout-induced transitions in this regime. In the dominant mechanism, the energy of an incoming readout photon is partially absorbed by the transmon and partially returned to the transmission line as a photon with lower frequency. Other mechanisms involve the excitation of unwanted package modes, decay via material defects, and, at higher qubit frequencies, the activation of undesired resonances in the transmon spectrum. Our work provides a comprehensive characterization of superconducting qubit state transitions caused by a strong drive.
Forward citations
Cited by 11 Pith papers
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Collapse and Inversion of the Josephson Potential in a Strongly Driven Superconducting Circuit
The Josephson potential of a transmon collapses and inverts under a strong fast flux drive, dynamically stabilizing the qubit at φ=π, as shown by spectroscopy and readout.
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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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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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Measurement-induced state transitions in multi-qubit transmon processors
In two-transmon systems, a spectator qubit lowers the MIST threshold of the readout qubit and can itself be affected by the readout qubit's transitions, with a coupler further modifying both effects.
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Single-Step Phase-Engineered Pulse for Active Readout Cavity Reset in Superconducting Circuits
A single phase-engineered reset segment appended to a square readout pulse empties the circuit-QED cavity ~6× faster than free decay with no extra hardware and no extra backaction.
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The Pound-Drever-Hall Method for Superconducting-Qubit Readout
Three-tone Pound-Drever-Hall readout cancels microwave phase drift in a transmon and tolerates strong detuned sidebands, pointing to a 14 dB readout-gain path.
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Suppression of measurement-induced state transitions in cos{\phi}-coupling transmon readout
A cos-phi-coupled transmon readout is experimentally free of measurement-induced state transitions up to roughly 300 photons, with flux-controlled activation of specific transitions.
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Mitigation of Measurement-Induced State Transitions via a Fast-Load and Fast-Clear Readout
State-independent fast-load/fast-clear three-step pulses suppress ng-dependent measurement-induced state transitions in transmons and minimize ng-averaged readout and post-readout errors.
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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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Characterizing charge-parity detection based on an offset-charge-tunable transmon qubit via randomized benchmarking
Offset-charge-tunable transmon qubit achieves 99.37% fidelity in charge-parity mapping and over 93.4% in continuous monitoring at 4 μs intervals via randomized benchmarking.
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