MiS Preprint Repository

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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.

Jul 17, 2018
Jul 18, 2018
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