Single-experiment-detectable multipartite entanglement witness for ensemble quantum computing

Abstract

In this paper we provide an operational method to detect multipartite entanglement in ensemble-based quantum computing. This method is based on the concept of entanglement witness. We decompose the entanglement witness for each class of multipartite entanglement into nonlocal operations in addition to local measurements. Individual single qubit measurements are performed simultaneously, hence complete detection of entanglement is performed in a single run experiment. This approach is particularly important for experiments where it is operationally difficult to prepare several copies of an unknown quantum state and in this sense the introduced scheme in this work is superior to the generally used entanglement witnesses that require a number of experiments and preparation of copies of quantum state.

9 pages, 5 figures, minor changes have been made

References in corpus (10)

• Scalable multi-particle entanglement of trapped ions
• Detecting Genuine Multipartite Entanglement with Two Local Measurements
• Experimental Analysis of a 4-Qubit Cluster State
• Entanglement Detection in the Stabilizer Formalism
• Nonlinear entanglement witnesses
• Energy as an Entanglement Witness for Quantum Many-Body Systems
• Entanglement Detection in Optical Lattices of Bosonic Atoms with Collective Measurements
• Entanglement Energetics at Zero Temperature
• Estimating entanglement of unknown states
• Detection of multipartite entanglement with two-body correlations

Cited by in corpus (9)

• Quantum discord and its allies: a review
• Single-experiment-detectable nonclassical correlation witness
• Identification and control of electron-nuclear spin defects in diamond
• Quantum teleportation with nonclassical correlated states in noninertial frames
• Quantum coherences of indistinguishable particles
• Generating entanglement of photon-number states with coherent light via cross-Kerr nonlinearity
• Witnessing nonclassical correlations via a single-shot experiment on an ensemble of spins using NMR
• Genuine Multipartite Entanglement induced by a Thermal Acoustic Reservoir
• Generation and Detection of Quantum Correlations and Entanglement on a Spin-Based Quantum Information Processor