Experimental demonstration of robustness of Gaussian quantum coherence
| Autor: | Na Wang, Haijun Kang, Shuhong Hao, Yang Liu, Dongmei Han, Xiaolong Su |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Quantum Physics
Gaussian FOS: Physical sciences Quantum entanglement Quantum channel Quantum key distribution Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials symbols.namesake Coherence theory Quantum mechanics symbols Quantum information Quantum Physics (quant-ph) Squeezed coherent state Coherence (physics) |
| Popis: | Besides quantum entanglement and steering, quantum coherence has also been identified as a useful quantum resource in quantum information. It is important to investigate the evolution of quantum coherence in practical quantum channels. In this paper, we experimentally quantify the quantum coherence of a squeezed state and a Gaussian Einstein–Podolsky–Rosen (EPR) entangled state transmitted in Gaussian thermal noise channel. By reconstructing the covariance matrix of the transmitted states, quantum coherence of these Gaussian states is quantified by calculating the relative entropy. We show that quantum coherence of the squeezed state and the Gaussian EPR entangled state is robust against loss and noise in a quantum channel, which is different from the properties of squeezing and Gaussian entanglement. Our experimental results pave the way for application of Gaussian quantum coherence in lossy and noisy environments. |
| Databáze: | OpenAIRE |
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