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Article overview
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Quantum Coherence Witness with Untrusted Measurement Devices | You-Qi Nie
; Hongyi Zhou
; Jian-Yu Guan
; Qiang Zhang
; Xiongfeng Ma
; Jun Zhang
; Jian-Wei Pan
; | Date: |
14 Aug 2019 | Abstract: | Coherence is a fundamental resource in quantum information processing, which
can be certified by a coherence witness. Due to the imperfection of measurement
devices, a conventional coherence witness may lead to fallacious results. We
show that the conventional witness could mistake an incoherent state as a state
with coherence due to the inaccurate settings of measurement bases. In order to
make the witness result reliable, we propose a measurement-device-independent
coherence witness scheme without any assumptions on the measurement settings.
We introduce the decoy-state method to significantly increase the capability of
recognizing states with coherence. Furthermore, we experimentally demonstrate
the scheme in a time-bin encoding optical system. | Source: | arXiv, 1908.5022 | Services: | Forum | Review | PDF | Favorites |
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