Flux control of superconducting qubits at dynamical sweet spots
arXiv:1912.09416
Abstract
Scaling up superconducting quantum processors with optimized performance requires a sufficient flexibility in the choice of operating points for single and two qubit gates to maximize their fidelity and cope with imperfections. Flux control is an efficient technique to manipulate the parameters of tunable qubits, in particular to activate entangling gates. At flux sensitive points of operation, the ubiquitous presence of 1/f flux noise however gives rise to dephasing by inducing fluctuations of the qubit frequency. We show how two-tone modulation of the flux bias, a bichromatic modulation, gives rise to a continuum of dynamical sweet spots where dephasing due to slow flux noise is suppressed to first order for a wide range of time-averaged qubit frequencies. The qubits can be operated at these dynamical sweet spots to realize protected entangling gates and to avoid collisions with two-level-system defects.
References in corpus (26)
- Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
- Charge insensitive qubit design derived from the Cooper pair box
- Manipulating the Quantum State of an Electrical Circuit
- Error mitigation for short-depth quantum circuits
- Extending the computational reach of a noisy superconducting quantum processor
- Fluxonium: single Cooper pair circuit free of charge offsets
- Decoherence in a superconducting quantum bit circuit
- Realization of Three-Qubit Quantum Error Correction with Superconducting Circuits
- The Flux Qubit Revisited to Enhance Coherence and Reproducibility
- Preparation and Measurement of Three-Qubit Entanglement in a Superconducting Circuit
- Decoherence of flux qubits due to 1/f flux noise
- Hybrid circuit cavity quantum electrodynamics with a micromechanical resonator
- Correlating decoherence in transmon qubits: Low frequency noise by single fluctuators
- Quantum logic gates for coupled superconducting phase qubits
- Model for l/f Flux Noise in SQUIDs and Qubits
- First-order sideband transitions with flux-driven asymmetric transmon qubits
- Electric field spectroscopy of material defects in transmon qubits
- Origin and Suppression of Magnetic Flux Noise
- Parametric coupling for superconducting qubits
- Motional Averaging in a Superconducting Qubit
- Random access quantum information processors
- Realization of a system with metastable states of a capacitively-shunted fluxonium
- Diabatic gates for frequency-tunable superconducting qubits
- Circuit quantization in the presence of time-dependent external flux
- Qubit metrology of ultralow phase noise using randomized benchmarking
- Analysis of parametrically driven exchange-type (iSWAP) and two-photon (bSWAP) interactions between superconducting qubits