Deterministic Local Expansion of W States

Abstract

In large quantum systems multipartite entanglement can be found in many inequivalent classes under local operations and classical communication. Preparing states of arbitrary size in different classes is important for performing a wide range of quantum protocols. W states, in particular, constitute a class with a variety of quantum networking protocols. However, all known schemes for preparing W states are probabilistic, with resource requirements increasing at least sub-exponentially. We propose a deterministic scheme for preparing W states that requires no prior entanglement and can be performed locally. We introduce an all-optical setup that can efficiently prepare W states of arbitrary size. Our scheme advances the use of W states in real-world quantum networks and could be extended to other physical systems.

8 pages, 4 color figures

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• Deterministic preparation of W states via spin-photon interactions
• Efficiently improving the performance of noisy quantum computers
• Generation of n-qubit W states using Spin Torque
• Freezing Optical Rogue Waves by Zeno Dynamics
• Nonlocal Activation of Bound Entanglement via Local Quantum Zeno Dynamics
• Experimental sample-efficient quantum state tomography via parallel measurements
• Constructions of genuinely entangled multipartite states with applications to local hidden variables (LHV) and states (LHS) models
• Fusion of atomic W-like states in cavity QED systems
• 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
• Affect of Simulated Atmospheric Turbulence on Three Entangled Photons