Quantum speed limit for mixed states using an experimentally realizable metric

摘要: Abstract Here, we introduce a new metric for non-degenerate density operator evolving along unitary orbit and show that this is experimentally realizable operation dependent on the quantum state space. Using metric, obtain geometric uncertainty relation leads to speed limit (QSL). We also Margolus–Levitin bound an improved Chau mixed states. propose how measure distance in interferometry. Finally, generalize QSL completely positive trace preserving evolutions.