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23 April 2024
 
  » arxiv » 1908.5022

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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
AbstractCoherence 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
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