Complementary Relationships between Entanglement and Measurement

• URL: http://arxiv.org/abs/2401.17537v3
• Date: Sat, 31 Aug 2024 19:24:40 GMT
• Title: Complementary Relationships between Entanglement and Measurement
• Authors: Michael Steiner, Ronald Rendell,
• Abstract summary: For qubit systems, both measurement on a single system and measurements on a bipartite system are considered in regards to the entanglement. It is proven that $overlineE+Dle 1$ holds where $overlineE$ is the average entanglement after a measurement is made. We conclude that the amount of disturbance and information gain that one can gain are strictly limited by entanglement.
• Score: 0.6261444979025641
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Complementary relationships exist regarding interference properties of particles such as pattern visibility, predictability and distinguishability. Additionally, relationships are known between information gain $G$ and measurement disturbance $F$ for entangled spin pairs. The question of whether a similar complementary relationship between entanglement and measurement occurs is examined herein. For qubit systems, both measurement on a single system and measurements on a bipartite system are considered in regards to the entanglement. It is proven that $\overline{E}+D\le 1$ holds where $\overline{E}$ is the average entanglement after a measurement is made and for which $D$ is a measure of the measurement disturbance of a single measurement. For measurements on a bipartite system shared by Alice and Bob ,it is shown that $\overline{E}+\overline{G}\le 1$ where $\overline{G}$ is the maximum average information gain regarding Alice's result that can be obtained by Bob. These results are generalized for arbitrary initial mixed states and as well to non-Hermitian operators. In the case of maximally entangled initial states, it is found that $D\le E_{L}$ and $\overline{G}\le E_{L}$ where $E_{L}$ is the entanglement loss due to measurement by Alice. We conclude that the amount of disturbance and information gain that one can gain are strictly limited by entanglement.

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