Coherence of Superposition States* |
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Authors: | Shan-Shan Yuwen Lian-He Shao Zheng-Jun Xi |
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Affiliation: | 1. College of Computer Science, Shaanxi Normal University, Xi'an 710062, China;2. School of Computer Science, Xi'an Polytechnic University, Xi'an 710048, China |
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Abstract: | We find tight upper bound on the coherence of a superposition of two states in terms of the coherence of the two states constituting the superposition with $l_{1}$-norm of coherence. Our upper bound is tighter than the one presented by Liu, et al. [Quantum Inf. Process. 15 (2016) 4209.] We also generalize the results to the case that the superposition is constituted with more than two states in high dimension, and we give the corresponding upper bounds. |
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Keywords: | quantum coherence superposition states $l_1$-norm of coherence |
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