MiS Preprint Repository

We have decided to discontinue the publication of preprints on our preprint server as of 1 March 2024. The publication culture within mathematics has changed so much due to the rise of repositories such as ArXiV ( that we are encouraging all institute members to make their preprints available there. An institute's repository in its previous form is, therefore, unnecessary. The preprints published to date will remain available here, but we will not add any new preprints here.

MiS Preprint

Experimental Demonstration of Observability and Operability of Robustness of Coherence

Wenqiang Zheng, Zhi-Hao Ma, Hengyan Wang, Shao-Ming Fei and Xinhua Peng


Quantum coherence is an invaluable physical resource for various quantum technologies. As a bona fide measure in quantifying coherence, the robustness of coherence (RoC) is not only mathematically rigorous, but also physically meaningful. We experimentally demonstrate the witness-observable and operational feature of the RoC in a multi-qubit nuclear magnetic resonance system. We realize witness measurements by detecting the populations of quantum systems in one trial. The approach may also apply to physical systems compatible with ensemble or nondemolition measurements.

Moreover, we experimentally show that the RoC quantifies the advantage enabled by a quantum state in a phase discrimination task.

03.67.Lx, 03.67.Pp, 76.60.-k

Related publications

2018 Repository Open Access
Wenqiang Zheng, Zhi-Hao Ma, Hengyan Wang, Shao-Ming Fei and Xinhua Peng

Experimental demonstration of observability and operability of robustness of coherence

In: Physical review letters, 120 (2018) 23, p. 230504