We present a simple proof of the minimum time for the quantum evolution between two arbitrary states. This proof is performed in the absence of any geometrical arguments. Then, being in the geometric framework of quantum evolutions based upon the geometry of the projective Hilbert space, we discuss the roles played by either minimum-time or maximum-energy uncertainty concepts in defining a geometric efficiency measure of quantum evolutions between two arbitrary quantum states. Finally, we provide a quantitative justification of the validity of the efficiency inequality even when the system passes only through nonorthogonal quantum states.
Enhanced quantum state discrimination under general measurements with entanglement and nonorthogonality restrictions
Harish-Chandra Research Institute, A CI of Homi Bhabha National Institute（哈拉·钱德拉研究所，霍米·巴巴国立学院附属机构）；Center for Quantum Science and Technology (CQST) and Center for Computational Natural Sciences and Bioinformatics (CCNSB), International Institute of Information Technology Hyderabad（量子科学与技术中心（CQST）和计算自然科学与生物信息学中心（CCNSB），海得拉巴国际信息技术学院）
Improved Measurement Cost Scaling in the Nonorthogonal Quantum Eigensolver
Berkeley Center for Quantum Information and Computation（伯克利量子信息与计算中心）；Department of Chemistry, University of California, Berkeley（加州大学伯克利分校化学系）；Challenge Institute for Quantum Computation（挑战量子计算研究所）
