Demonstration of local expansion toward large-scale entangled webs

Abstract

We demonstrate an optical gate that increases the size of polarization-based W states by accessing only one of the qubits. Using this gate, we have generated three-photon and four-photon W states with fidelities $0.836\pm 0.042$ and $0.784\pm 0.028$, respectively. We also confirmed existence of pairwise entanglement in every pair of the qubits including the one that was left untouched by the gate. The gate is applicable to any size of W states and hence is a universal tool for expanding entanglement.

5 pages, 4 figures

References in corpus (5)

• Entanglement detection
• Silica-on-Silicon Waveguide Quantum Circuits
• Beating the Standard Quantum Limit with Four Entangled Photons
• Experimental entanglement of six photons in graph states
• Simple scheme for expanding a polarization-entangled W state by adding one photon

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• Quantum Fisher Information of W States in Decoherence Channels
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• Optimal local expansion of W states using linear optics and Fock states
• Deterministic preparation of W states via spin-photon interactions
• Efficient generation of multipartite W state via quantum eraser
• Quantum Repeater for W states
• Photonic multipartite entanglement conversion using nonlocal operations
• Remote preparation of $W$ states from imperfect bipartite sources
• Efficient linear optical generation of a multipartite W state
• Heralded generation of entanglement with photons
• Efficient Fusion of Photonic W-states with Nonunitary Partial-swap Gates
• Two methods for measuring Bell nonlocality via local unitary invariants of two-qubit systems in Hong-Ou-Mandel interferometers
• Deterministic construction of arbitrary $W$ states with quadratically increasing number of two-qubit gates
• Scalable and modular generation of multipartite entangled states through memory-enhanced fusion
• Optimal concentrating arbitrary partially entangled W states with linear optics