Robustness of longitudinal transmon readout to ionization
arXiv:2412.07734 · doi:10.1103/mp2x-zj3y
Abstract
Multi-photon processes deteriorate the quantum non-demolition (QND) character of the dispersive readout in circuit QED, causing readout to lag behind single and two-qubit gates, in both speed and fidelity. Alternative methods such as the longitudinal readout have been proposed, however, it is unknown to what extent multi-photon processes hinder this approach. Here we investigate the QND character of the longitudinal readout of the transmon qubit. We show that the deleterious effects that arise due to multi-photon transitions can be heavily suppressed with detuning, owing to the fact that the longitudinal interaction strength is independent of the transmon-resonator detuning. We consider the effect of circuit disorder, the selection rules that act on the transmon, as well as the description of longitudinal readout in the classical limit of the transmon to show qualitatively that longitudinal readout is robust. We show that fast, high-fidelity QND readout of transmon qubits is possible with longitudinal coupling.
References in corpus (36)
- Charge insensitive qubit design derived from the Cooper pair box
- QuTiP 2: A Python framework for the dynamics of open quantum systems
- QuTiP: An open-source Python framework for the dynamics of open quantum systems
- Circuit Quantum Electrodynamics
- Quantum Error Correction for Quantum Memories
- Quantum information processing with circuit quantum electrodynamics
- A simple all-microwave entangling gate for fixed-frequency superconducting qubits
- Realizing Rapid, High-Fidelity, Single-Shot Dispersive Readout of Superconducting Qubits
- To catch and reverse a quantum jump mid-flight
- Introduction to Quantum Electromagnetic Circuits
- Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect
- Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
- Measurement-induced state transitions in a superconducting qubit: Beyond the rotating wave approximation
- Fast quantum non-demolition readout from longitudinal qubit-oscillator interaction
- Fast readout and reset of a superconducting qubit coupled to a resonator with an intrinsic Purcell filter
- Gated conditional displacement readout of superconducting qubits
- Improved Superconducting Qubit Readout by Qubit-Induced Nonlinearities
- Kerr-free three-wave mixing in superconducting quantum circuits
- Dynamics of Transmon Ionization
- Effect of higher-order nonlinearities on amplification and squeezing in Josephson parametric amplifiers
- Measurement-Induced State Transitions in a Superconducting Qubit: Within the Rotating Wave Approximation
- Fast high fidelity quantum non-demolition qubit readout via a non-perturbative cross-Kerr coupling
- General method for extracting the quantum efficiency of dispersive qubit readout in circuit QED
- Measurement-Induced Transmon Ionization
- Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic Control of the Dispersive Shift: Experiment and Theory
- High-fidelity parametric beamsplitting with a parity-protected converter
- Error per single-qubit gate below in a superconducting qubit
- Structural instability of driven Josephson circuits prevented by an inductive shunt
- Inductively shunted transmon qubit with tunable transverse and longitudinal coupling
- Qubit Measurement by Multichannel Driving
- Realization of High-Fidelity CZ Gate based on a Double-Transmon Coupler
- Engineering Purely Nonlinear Coupling with the Quarton
- Ideal Quantum Nondemolition Readout of a Flux Qubit Without Purcell Limitations
- Optimal control in large open quantum systems: the case of transmon readout and reset
- Qubit readouts enabled by qubit cloaking
- Strong Intrinsic Longitudinal Coupling in Circuit Quantum Electrodynamics