Entanglement of mixed macroscopic superpositions: an entangling-power study

Abstract

We investigate entanglement properties of a recently introduced class of macroscopic quantum superpositions in two-mode mixed states. One of the tools we use in order to infer the entanglement in this non-Gaussian class of states is the power to entangle a qubit system. Our study reveals features which are hidden in a standard approach to entanglement investigation based on the uncertainty principle of the quadrature variables. We briefly describe the experimental setup corresponding to our theoretical scenario and a suitable modification of the protocol which makes our proposal realizable within the current experimental capabilities.

9 pages, 7 figures, RevTeX4

References in corpus (9)

• A near deterministic linear optical CNOT gate
• Detecting Genuine Multipartite Entanglement with Two Local Measurements
• A symmetry analyser for non-destructive Bell state detection using EIT
• Inseparability inequalities for higher-order moments for bipartite systems
• High Temperature Macroscopic Entanglement
• Using weak nonlinearity under decoherence for macroscopic-entanglement generation and quantum computation
• Natural multiparticle entanglement in a Fermi gas
• Vibrational coherent quantum computation
• Hybrid cluster state proposal for a quantum game

Cited by in corpus (9)

• Qubit-assisted thermometry of a quantum harmonic oscillator
• Failure of Local Realism Revealed by Extremely Coarse-Grained Measurements
• Fidelity deviation in quantum teleportation
• Bell inequality tests using asymmetric entangled coherent states in asymmetric lossy environments
• Decoherence of Highly Mixed Macroscopic Quantum Superpositions
• Genuine multipartite nonlocality of entangled thermal states
• Characterization of the entanglement of two squeezed states
• A simple coin for a $2d$ entangled walk
• Production of entanglement with highly-mixed states