Decoherence of a tunable capacitively shunted flux qubit
arXiv:2307.13961 · doi:10.1038/s42005-025-02360-2
Abstract
Quantum annealing is a method to solve optimization problems that leverages quantum tunneling in a coupled qubit system. We present a detailed study of the coherence of a tunable capacitively-shunted flux qubit, designed for coherent quantum annealing applications. We find that for high qubit frequencies, thermal noise in the bias line makes a significant contribution to the relaxation, arising from the design choice to experimentally explore both fast annealing and high-frequency control. The measured dephasing rate is primarily due to intrinsic low-frequency flux noise in the two qubit loops, with additional contribution from the low-frequency noise of control electronics used for fast annealing. Our results characterize decoherence in a realistic setup for quantum annealing and are relevant for ongoing efforts toward building superconducting quantum annealers with increased coherence.
arXiv comment14 pages, 6 figures
References in corpus (57)
- Quantum Annealing in the Transverse Ising Model
- A Quantum Adiabatic Evolution Algorithm Applied to Random Instances of an NP-Complete Problem
- Adiabatic Quantum Computing
- Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
- Decoherence in Josephson Qubits from Dielectric Loss
- Fluxonium: single Cooper pair circuit free of charge offsets
- Coherent Josephson qubit suitable for scalable quantum integrated circuits
- A Superconducting Persistent Current Qubit
- Decoherence in a superconducting quantum bit circuit
- The Flux Qubit Revisited to Enhance Coherence and Reproducibility
- Superconducting qubit in waveguide cavity with coherence time approaching 0.1ms
- Perspectives of quantum annealing: Methods and implementations
- Controlling the spontaneous emission of a superconducting transmon qubit
- Towards understanding two-level-systems in amorphous solids -- Insights from quantum circuits
- AC-Stark Shift and Dephasing of a Superconducting Qubit Strongly Coupled to a Cavity Field
- Quantum Optimization of Maximum Independent Set using Rydberg Atom Arrays
- Emergence and Frustration of Magnetic Order with Variable-Range Interactions in a Trapped Ion Quantum Simulator
- Decoherence of flux qubits due to 1/f flux noise
- Surface participation and dielectric loss in superconducting qubits
- Dephasing of a superconducting qubit induced by photon noise
- Low-decoherence flux qubit
- 3D integrated superconducting qubits
- Computational Role of Multiqubit Tunneling in a Quantum Annealer
- Bifurcation-based adiabatic quantum computation with a nonlinear oscillator network: Toward quantum soft computing
- Simple proof of equivalence between adiabatic quantum computation and the circuit model
- 1/f Flux Noise in Josephson Phase Qubits
- Experimental Demonstration of a Robust and Scalable Flux Qubit
- Heralded state preparation in a superconducting qubit
- Dephasing of a superconducting flux qubit
- Decoherence in Josephson-junction qubits due to critical current fluctuations
- Quantum annealing with a network of all-to-all connected, two-photon driven Kerr nonlinear oscillators
- Decoherence in adiabatic quantum computation
- Scaling advantage in quantum simulation of geometrically frustrated magnets
- Dissipative Landau-Zener transitions of a qubit: bath-specific and universal behavior
- Observation of classical-quantum crossover of 1/f flux noise and its paramagnetic temperature dependence
- High coherence hybrid superconducting qubit
- Distinguishing coherent and thermal photon noise in a circuit QED system
- Spectroscopy of low-frequency noise and its temperature dependence in a superconducting qubit
- Characterizing and optimizing qubit coherence based on SQUID geometry
- Investigating surface loss effects in superconducting transmon qubits
- Flux qubit noise spectroscopy using Rabi oscillations under strong driving conditions
- Decoherence in a scalable adiabatic quantum computer
- Geometrical dependence of low frequency noise in superconducting flux qubits
- Demonstration of nonstoquastic Hamiltonian in coupled superconducting flux qubits
- Role of Single Qubit Decoherence Time in Adiabatic Quantum Computation
- Finite temperature quantum annealing solving exponentially small gap problem with non-monotonic success probability
- Noise correlations in a flux qubit with tunable tunnel coupling
- Exploring More-Coherent Quantum Annealing
- Probing High Frequency Noise with Macroscopic Resonant Tunneling
- Breakdown of the weak coupling limit in quantum annealing
- Tunable superconducting flux qubits with long coherence times
- Signatures of Open and Noisy Quantum Systems in Single-Qubit Quantum Annealing
- A double-slit proposal for quantum annealing
- Fast, Lifetime-Preserving Readout for High-Coherence Quantum Annealers
- Customized quantum annealing schedules
- Anneal-path correction in flux qubits
- Dissipative Landau-Zener tunneling in the crossover regime from weak to strong environment coupling