Quasiparticle tunneling and 1/f charge noise in ultrastrongly coupled superconducting qubit and resonator

Abstract

We report an experimentally observed anomalous doubly split spectrum and its split-width fluctuation in an ultrastrongly coupled superconducting qubit and resonator. From an analysis of Rabimodel and circuit model Hamiltonians, we found that the doubly split spectrum and split-width fluctuation are caused by discrete charge hops due to quasiparticle tunnelings and a continuous background charge fluctuation in islands of a flux qubit. During 70 hours in the spectrum measurement, split width fluctuates but the middle frequency of the split is constant. This result indicates that quasiparticles in our device seem mainly tunnel one particular junction. The background offsetcharge obtained from split width has the 1/f noise characteristic.

arXiv comment15 pages, 11 figures

References in corpus (47)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• scikit-image: Image processing in Python
• Charge insensitive qubit design derived from the Cooper pair box
• Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Superconducting Qubits: Current State of Play
• Ultrastrong coupling between light and matter
• Beyond the Jaynes-Cummings model: circuit QED in the ultrastrong coupling regime
• Ultrastrong coupling regimes of light-matter interaction
• Superconducting qubit-oscillator circuit beyond the ultrastrong-coupling regime
• Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
• Towards understanding two-level-systems in amorphous solids -- Insights from quantum circuits
• Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime
• Qubit-oscillator systems in the ultrastrong-coupling regime and their potential for preparing nonclassical states
• Dephasing of a superconducting qubit induced by photon noise
• Efficient and robust analysis of complex scattering data under noise in microwave resonators
• Quantum noise in the Josephson charge qubit
• Ultrastrong coupling regime of cavity QED with phase-biased flux qubits
• An analysis method for asymmetric resonator transmission applied to superconducting devices
• Millisecond charge-parity fluctuations and induced decoherence in a superconducting qubit
• Nonequilibrium quasiparticles and $2e$ periodicity in single-Cooper-pair transistors
• Relaxation and frequency shifts induced by quasiparticles in superconducting qubits
• Hot non-equilibrium quasiparticles in transmon qubits
• Resolution of Gauge Ambiguities in Ultrastrong-Coupling Cavity QED
• Ultrafast Quantum Gates in Circuit QED
• Correlating decoherence in transmon qubits: Low frequency noise by single fluctuators
• Flux Qubits with Long Coherence Times for Hybrid Quantum Circuits
• Suppressing relaxation in superconducting qubits by quasiparticle pumping
• Non-Poissonian Quantum Jumps of a Fluxonium Qubit due to Quasiparticle Excitations
• Nonequilibrium and nonperturbative dynamics of ultrastrong coupling in open lines
• Protected quantum computation with multiple resonators in ultrastrong coupling circuit QED
• Tutorial: Gate-based superconducting quantum computing
• Spectroscopy of low-frequency noise and its temperature dependence in a superconducting qubit
• Direct Dispersive Monitoring of Charge Parity in Offset-Charge-Sensitive Transmons
• Flux qubit noise spectroscopy using Rabi oscillations under strong driving conditions
• Scalable quantum computer with superconducting circuits in the ultrastrong coupling regime
• Aharonov-Casher-Effect Suppression of Macroscopic Tunneling of Magnetic Flux
• Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong- to the deep-strong-coupling regime
• Anomalous Charge Noise in Superconducting Qubits
• Kinetics of the superconducting charge qubit in the presence of a quasiparticle
• Long-lasting Quantum Memories: Extending the Coherence Time of Superconducting Artificial Atoms in the Ultrastrong-Coupling Regime
• Light-matter decoupling and $A^2$ term detection in superconducting circuits
• Parity effect in superconducting aluminum single electron transistors with spatial gap profile controlled by film thickness
• Creation of quantum error correcting codes in the ultrastrong coupling regime
• Dynamics of parametric fluctuations induced by quasiparticle tunneling in superconducting flux qubits
• Superconducting Quantum Annealing Architecture with LC Resonators
• Quantum annealing in spin-boson model: from a perturbative to a ultrastrong mediated coupling

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