Hybrid encoding of quantum information is a promising approach towards the realisation of optical quantum protocols. It combines advantages of continuous variables encoding, such as high efficiencies, with those of discrete variables, such as high fidelities. In particular, entangled hybrid states were shown to be a valuable ressource for quantum information protocols. In this work, we present a hybrid entanglement witness that can be implemented on available experiments and is robust to noise currently observed in quantum optical set-ups. The proposed witness is based on measurements of genuinely hybrid observables. The noise model we consider is general. It is formally characterised with Kraus operators since the considered hybrid system can be expressed in a finite dimension basis. A practical advantage of the witness is that it can be tested by measuring just a few experimentally available observables.

中文翻译：

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可实现的混合纠缠见证

量子信息的混合编码是实现光量子协议的一种有前途的方法。它结合了连续变量编码（例如高效）和离散变量（例如高保真）的优点。特别地，纠缠的混合态被证明是量子信息协议的宝贵资源。在这项工作中，我们提出了一种混合纠缠见证器，可以在可用的实验中实施，并且对目前在量子光学装置中观察到的噪声具有鲁棒性。拟议的证人是基于对真正的混合观测值的测量。我们考虑的噪声模型是通用的。由于考虑的混合系统可以在有限维的基础上表示，因此用Kraus运算符对其进行正式表征。