A geometric speed limit for imaginary-time evolution bounds evolution time by angular distance over averaged energy dispersion and is saturated in two-level and Grover-search examples.
Lloyd, Ultimate physical limits to computation, Na- ture, 406, 1047–1054 (2000)
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Saturable Quantum Speed Limits for Imaginary-Time Evolution
A geometric speed limit for imaginary-time evolution bounds evolution time by angular distance over averaged energy dispersion and is saturated in two-level and Grover-search examples.