Implementable hybrid entanglement witness Article Swipe
YOU?
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· 2020
· Open Access
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· DOI: https://doi.org/10.1103/physreva.102.062406
· OA: W3014194688
Hybrid encoding of quantum information is a promising approach towards the\nrealisation of optical quantum protocols. It combines advantages of continuous\nvariables encoding, such as high efficiencies, with those of discrete\nvariables, such as high fidelities. In particular, entangled hybrid states were\nshown to be a valuable ressource for quantum information protocols. In this\nwork, we present a hybrid entanglement witness that can be implemented on\ncurrently available experiments and is robust to noise currently observed in\nquantum optical set-ups. The proposed witness is based on measurements of\ngenuinely hybrid observables. The noise model we consider is general. It is\nformally characterised with Kraus operators since the considered hybrid system\ncan be expressed in a finite dimension basis. A practical advantage of the\nwitness is that it can be tested by measuring just a few experimentally\navailable observables.\n
