How to Enhance Dephasing Time in Superconducting Qubits

TL;DR

This paper demonstrates that carefully designed pulse sequences can significantly extend the coherence time of superconducting qubits affected by noise, and also serve as a spectroscopic method to analyze noise characteristics.

Contribution

It introduces optimized pulse sequences for coherence enhancement and proposes using pulse-induced coherence dynamics as a tool for noise spectroscopy in superconducting qubits.

Findings

Pulse sequences can substantially increase qubit coherence times.

Pulse sequences enable extraction of noise spectral density information.

Non-Gaussian decoherence features are suppressed by pulse application.

Abstract

We theoretically investigate the influence of designed pulse sequences in restoring quantum coherence lost due to background noise in superconducting qubits. We consider both 1/f noise and Random Telegraph Noise, and show that the qubit coherence time can be substantially enhanced by carefully engineered pulse sequences. Conversely, the time dependence of qubit coherence under external pulse sequences could be used as a spectroscopic tool for extracting the noise mechanisms in superconducting qubits, i.e. by using Uhrig's pulse sequence one can obtain information about moments of the spectral density of noise. We also study the effect of pulse sequences on the evolution of the qubit affected by a strongly coupled fluctuator, and show that the non-Gaussian features in decoherence are suppressed by the application of pulses.