Strong quantitative benchmarking of quantum optical devices

Details Strong quantitative benchmarking of quantum optical devices Strong quantitative benchmarking of quantum optical devices

2011-02-16

arxiv.org/abs/1102.3233v2

Phys. Rev. A 83, 052320 (2011)

Physics

Quantum Physics

11 pages, 7 figures. Comments are welcome. ver 2: Improved figures, no changes to main text

Scientific paper

10.1103/PhysRevA.83.052320

Quantum communication devices, such as quantum repeaters, quantum memories, or quantum channels, are unavoidably exposed to imperfections. However, the presence of imperfections can be tolerated, as long as we can verify such devices retain their quantum advantages. Benchmarks based on witnessing entanglement have proven useful for verifying the true quantum nature of these devices. The next challenge is to characterize how strongly a device is within the quantum domain. We present a method, based on entanglement measures and rigorous state truncation, which allows us to characterize the degree of quantumness of optical devices. This method serves as a quantitative extension to a large class of previously-known quantum benchmarks, requiring no additional information beyond what is already used for the non-quantitative benchmarks.

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