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arXiv:2212.07627 · Communications in Theoretical Physics

Decoherence-free subspace and entanglement sudden death of multi-photon polarization states in fiber channels

Yi‐Wen Liu

Published Feb 10, 2023• 4 citations

Abstract

Abstract The construction of quantum networks requires long-distance teleportation of multi-qubit entangled states. Here, we investigate the entanglement dynamics of GHZ and W states in fiber channels. In a fiber channel, the two most important phenomena that affect polarization entanglement are polarization mode dispersion (PMD) and polarization-dependent loss (PDL). We theoretically characterize how PMD and PDL vectors affect three-qubit states. In particular, upon quantifying the entanglement at the output states using concurrence and entanglement witnesses, we reveal the occurrence of entanglement sudden death and the appearance of decoherence-free subspaces in tripartite systems. Finally, we explore the evolution of GHZ and W state with an arbitrary number of photons in a fiber network and discuss the decoherence mechanism of the 4-party cluster state.

DOI: 10.1088/1572-9494/acbaed

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