Unified approach to witness non-entanglement-breaking quantum channels
Abstract
The ability of quantum devices to preserve or distribute entanglement is essential in employing quantum technologies. Such ability is described and guaranteed by the non-entanglement-breaking (nonEB) feature of participating quantum channels. For quantum information applications relying on entanglement, the certification of the nonEB feature is indispensable in designing, testing, and benchmarking quantum devices. Here, we develop a simple and direct approach for the certification of nonEB quantum channels. By utilizing the prepare-and-measure test, we derive a necessary and sufficient condition for witnessing the nonEB channels, which is applicable in almost all experimental scenarios. The approach not only unifies and simplifies existing methods in the standard scenario and the measurement-device-independent scenario, but also furthers the nonEB channel certification in the semi-device-independent scenario.
- Publication:
-
Physical Review A
- Pub Date:
- June 2020
- DOI:
- 10.1103/PhysRevA.101.062301
- arXiv:
- arXiv:1912.10605
- Bibcode:
- 2020PhRvA.101f2301Z
- Keywords:
-
- Quantum Physics
- E-Print:
- 14 pages, comments are welcomed. Added references and proofs