Figure 2 | Scientific Reports

Figure 2

From: Experimental demonstration of high fidelity entanglement distribution over decoherence channels via qubit transduction

Figure 2

Experimental setup.

(a) Qubit transduction (QT) is performed before an initial two-qubit polarization-entangled state is launched to the decoherence channels (D1 and D2). The QT setup consists of a polarization-dependent beam displacer (BD) and a 45°-oriented half-wave plate (HWP). After the decoherence channels, QT is performed again to convert the two-qubit dual-rail state back to a two-qubit polarization state. Quantum state tomography (QST) is performed with a half-wave plate (HWP), a quarter-wave plate (QWP) and a polarizer, to analyse the two-qubit polarization state. (b) Amplitude-damping decoherence is realized by using a set of a partially-polarizing beam splitter (PPBS), a beam splitter (BS) and a half-wave plate (HWP). (c) Decoherence due to polarization-mode dispersion (PMD) is implemented by a quartz plate of thickness L.

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