How to enhance dephasing time in superconducting qubits

2007/12/31 by L. Cywinski, Łukasz Cywiński, R. M. Lutchyn +4 · 6 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum Mechanics and Applications #Spectroscopy and Quantum Chemical Studies #cond-mat.mes-hall #cond-mat.supr-con #quant-ph

paper · pdf · doi:10.1103/physrevb.77.174509

published as Phys. Rev. B 77, 174509 (2008) · 12 pages, 5 figures, extended version accepted for publication in Phys. Rev. B

arxiv created 2008/04/22 · openalex publication_date 2008/05/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

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 [Phys. Rev. Lett. 98, 100504 (2007)], 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.

Citations

• Charge-insensitive qubit design derived from the Cooper pair box
• Restoring Coherence Lost to a Slow Interacting Mesoscopic Spin Bath
• Optimization of short coherent control pulses
• NMR Techniques for Quantum Control and Computation
• Quantum-state engineering with Josephson-junction devices
• Low- and High-Frequency Noise from Coherent Two-Level Systems
• Decoherence from ensembles of two-level fluctuators
• Decoherence, einselection, and the quantum origins of the classical
• Ohmic and Step Noise from a Single Trapping Center Hybridized with a Fermi Sea

Cited by

• Exact results on dynamical decoupling by π pulses in quantum information processes
• Comparison of dynamical decoupling protocols for a nitrogen-vacancy center in diamond
• Atomic-scale magnetometry of distant nuclear spin clusters via nitrogen-vacancy spin in diamond
• Limits on preserving quantum coherence using multipulse control
• Dynamical decoupling design for identifying weakly coupled nuclear spins in a bath
• Anomalous behavior of control pulses in presence of noise with singular autocorrelation