Entanglement at distance: qubits versus continuous variables

Physics – Quantum Physics

Scientific paper

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5 pages. 4 eps files. Use fortschritte.sty (included)

Scientific paper

10.1002/prop.200310064

We consider the problem of obtaining maximally entangled photon states at distance in the presence of loss. We compare the efficiency of two different schemes in establishing $N$ shared ebits: i) $N$ single ebit states with the qubit encoded on polarization; ii) a single continuous variable entangled state (emode) assisted by optimal local operation and classical communication (LOCC) protocol in order to obtain a $2^N$-dimensional maximally entangled state, with qubits encoded on the photon number.

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