Single-copies estimation of entanglement negativity
- URL: http://arxiv.org/abs/2004.11360v1
- Date: Thu, 23 Apr 2020 17:57:01 GMT
- Title: Single-copies estimation of entanglement negativity
- Authors: You Zhou, Pei Zeng, Zhenhuan Liu
- Abstract summary: Entanglement plays a central role in quantum information processing.
We propose a scheme to estimate the entanglement negativity of any bi- partition of a composite system.
- Score: 1.7179583883220435
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Entanglement plays a central role in quantum information processing,
indicating the non-local correlation of quantum matters. However, few effective
ways are known to detect the amount of entanglement of an unknown quantum
state. In this work, we propose a scheme to estimate the entanglement
negativity of any bi-partition of a composite system. The proposed scheme is
based on the random unitary evolution and local measurements on the single-copy
quantum states, which is more practical compared with former methods based on
collective measurements on many copies of the identical state. Meanwhile, we
generalize the scheme to quantify the total multi-partite correlation. We
demonstrate the efficiency of the scheme with theoretical statistical analysis
and numerical simulations. The proposed scheme is quite suitable for
state-of-the-art quantum platforms, which can serve as not only a useful
benchmarking tool to advance the quantum technology, but also a probe to study
fundamental quantum physics, such as the entanglement dynamics.
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