Measurement-induced nonlocality in arbitrary dimensions in terms of the inverse approximate joint diagonalization

作者：Zhang, Li-qiang; Ma, Ting-ting; Yu, Chang-shui^*

来源：Physical Review A, 2018, 97(3): 032112.

DOI：10.1103/PhysRevA.97.032112

• ENTANGLEMENT
• QUANTUM

The computability of the quantifier of a given quantum resource is the essential challenge in the resource theory and the inevitable bottleneck for its application. Here we focus on the measurement-induced nonlocality and present a redefinition in terms of the skew information subject to a broken observable. It is shown that the obtained quantity possesses an obvious operational meaning, can tackle the noncontractivity of the measurement-induced nonlocality and has analytic expressions for pure states, (2 circle times d)-dimensional quantum states, and some particular high-dimensional quantum states. Most importantly, an inverse approximate joint diagonalization algorithm, due to its simplicity, high efficiency, stability, and state independence, is presented to provide almost-analytic expressions for any quantum state, which can also shed light on other aspects in physics. To illustrate applications as well as demonstrate the validity of the algorithm, we compare the analytic and numerical expressions of various examples and show their perfect consistency.

• 出版日期2018-3-15
• 单位大连理工大学