Limits on preserving quantum coherence using multipulse control
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We explore the physical limits of pulsed dynamical decoupling methods for decoherence control as determined by finite timing resources. By focusing on a decohering qubit controlled by arbitrary sequences of pulses, we establish a nonperturbative quantitative upper bound to the achievable coherence for specified maximum pulsing rate and noise spectral bandwidth. We introduce numerically optimized control "bandwidth-adapted" sequences that saturate the performance bound and show how they outperform existing sequences in a realistic excitonic-qubit system where timing constraints are significant. As a by-product, our analysis reinforces the impossibility of fault-tolerance accuracy thresholds for generic open quantum systems under purely reversible error control. 2011 American Physical Society.
author list (cited authors)
Khodjasteh, K., Erdlyi, T., & Viola, L.
complete list of authors
Khodjasteh, Kaveh||Erdélyi, Támas||Viola, Lorenza