Tightening Quantum Speed Limits for Almost All States

Francesco Campaioli, Felix A. Pollock, Felix C. Binder, Kavan Modi

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33 Citations (Scopus)


Conventional quantum speed limits perform poorly for mixed quantum states: They are generally not tight and often significantly underestimate the fastest possible evolution speed. To remedy this, for unitary driving, we derive two quantum speed limits that outperform the traditional bounds for almost all quantum states. Moreover, our bounds are significantly simpler to compute as well as experimentally more accessible. Our bounds have a clear geometric interpretation; they arise from the evaluation of the angle between generalized Bloch vectors.

Original languageEnglish
Article number060409
Number of pages5
JournalPhysical Review Letters
Issue number6
Publication statusPublished - 9 Feb 2018

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