REVIEW 6 cited by
Full characterization of measurement-induced transitions of a superconducting qubit
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
Full characterization of measurement-induced transitions of a superconducting qubit
read the original abstract
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 6 Pith papers
-
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.
-
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.
-
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...
-
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.
-
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...
-
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.
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.