A long-lived capacitively shunted flux qubit embedded in a 3D cavity

Abstract

We report the experimental realization of a 3D capacitively-shunt superconducting flux qubit with long coherence times. At the optimal flux bias point, the qubit demonstrates energy relaxation times in the 60-90 $\mu$s range, and Hahn-echo coherence time of about 80 $\mu$s which can be further improved by dynamical decoupling. Qubit energy relaxation can be attributed to quasiparticle tunneling, while qubit dephasing is caused by flux noise away from the optimal point. Our results show that 3D c-shunt flux qubits demonstrate improved performance over other types of flux qubits which is advantageous for applications such as quantum magnetometry and spin sensing.

arXiv commentmain text (4 pages) + supplementary materials (6 pages), submitted to APL

References in corpus (28)

• Charge insensitive qubit design derived from the Cooper pair box
• Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture
• Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
• 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
• Decoherence of flux qubits due to 1/f flux noise
• Surface participation and dielectric loss in superconducting qubits
• Fluctuations of Energy-Relaxation Times in Superconducting Qubits
• Decoherence benchmarking of superconducting qubits
• Dephasing of a superconducting qubit induced by photon noise
• Low-decoherence flux qubit
• Relaxation and frequency shifts induced by quasiparticles in superconducting qubits
• Protecting superconducting qubits from external sources of loss and heat
• Dephasing of a superconducting flux qubit
• Quasiparticle relaxation of superconducting qubits in the presence of flux
• Flux Qubits with Long Coherence Times for Hybrid Quantum Circuits
• Experimental Uhrig Dynamical Decoupling using Trapped Ions
• Interacting two-level defects as sources of fluctuating high-frequency noise in superconducting circuits
• Improved Superconducting Qubit Readout by Qubit-Induced Nonlinearities
• Response of the Strongly-Driven Jaynes-Cummings Oscillator
• High coherence hybrid superconducting qubit
• Distinguishing coherent and thermal photon noise in a circuit QED system
• Ultrasensitive magnetic field detection using a single artificial atom
• Quantum-enhanced magnetometry by phase estimation algorithms with a single artificial atom
• Electron paramagnetic resonance spectroscopy using a single artificial atom

Cited by in corpus (22)

• Quantum control of bosonic modes with superconducting circuits
• Enhanced coherence of all-nitride superconducting qubits epitaxially grown on silicon substrate
• Error-Mitigated Quantum Metrology via Virtual Purification
• Quantum-Enhanced Heat Engine Based on Superabsorption
• Engineering Purely Nonlinear Coupling with the Quarton
• Photon-Dressed Bloch-Siegert Shift in an Ultrastrongly Coupled Circuit Quantum Electrodynamical System
• Identification of different types of high-frequency defects in superconducting qubits
• Electron Spin Resonance with up to 20 Spin Sensitivity Measured using a Superconducting Flux Qubit
• The scattering coefficients of superconducting microwave resonators: I. Transfer-matrix approach
• Superconducting flux qubit with ferromagnetic Josephson $\pi$-junction operating at zero magnetic field
• Enhanced coherence in superconducting circuits via band engineering
• Driven-state relaxation of a coupled qubit-defect system in spin-locking measurements
• Entanglement-enhanced sensing using a chain of qubits with always-on nearest-neighbor interactions
• Quantum annealing with twisted fields
• Simple realization of a hybrid controlled-controlled-Z gate with photonic control qubits encoded via eigenstates of the photon-number parity operator
• Gate-Compatible Circuit Quantum Electrodynamics in a Three-Dimensional Cavity Architecture
• Stable and Efficient Charging of Superconducting Capacitively Shunted Flux Quantum Batteries
• Vortex-Meissner phase transition induced by two-tone-drive-engineered artificial gauge potential in the fermionic ladder constructed by superconducting qubit circuits
• Control of transition frequency of a superconducting flux qubit by longitudinal coupling to the photon number degree of freedom in a resonator
• Magnetic flux induced higher-order topological superconductivity
• Massive quantum superpositions using magneto-mechanics
• Polarizing electron spins with a superconducting flux qubit