Generating multi-photon W-like states for perfect quantum teleportation and superdense coding. (English) Zbl 1348.81094
Summary: An interesting aspect of multipartite entanglement is that for perfect teleportation and superdense coding, not the maximally entangled W states but a special class of non-maximally entangled W-like states are required. Therefore, efficient preparation of such W-like states is of great importance in quantum communications, which has not been studied as much as the preparation of W states. In this paper, we propose a simple optical scheme for efficient preparation of large-scale polarization-based entangled W-like states by fusing two W-like states or expanding a W-like state with an ancilla photon. Our scheme can also generate large-scale W states by fusing or expanding W or even W-like states. The cost analysis shows that in generating large-scale W states, the fusion mechanism achieves a higher efficiency with non-maximally entangled W-like states than maximally entangled W states. Our scheme can also start fusion or expansion with Bell states, and it is composed of a polarization-dependent beam splitter, two polarizing beam splitters and photon detectors. Requiring no ancilla photon or controlled gate to operate, our scheme can be realized with the current photonics technology and we believe it enable advances in quantum teleportation and superdense coding in multipartite settings.
MSC:
| 81P40 | Quantum coherence, entanglement, quantum correlations |
| 81V80 | Quantum optics |
| 81P45 | Quantum information, communication, networks (quantum-theoretic aspects) |
| 81P15 | Quantum measurement theory, state operations, state preparations |
Keywords:
W-like state; polarization-dependent beam splitter; quantum state fusion; quantum state expansionReferences:
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