Manipulating quantum information by propagation

Abstract

We study creation of bi- and multipartite continuous variable entanglement in structures of coupled quantum harmonic oscillators. By adjusting the interaction strengths between nearest neighbors we show how to maximize the entanglement production between the arms in a Y-shaped structure where an initial single mode squeezed state is created in the first oscillator of the input arm. We also consider the action of the same structure as an approximate quantum cloner. For a specific time in the system dynamics the last oscillators in the output arms can be considered as imperfect copies of the initial state. By increasing the number of arms in the structure, multipartite entanglement is obtained, as well as 1 to M cloning. Finally, we are considering configurations that implement the symmetric splitting of an initial entangled state. All calculations are carried out within the framework of the rotating wave approximation in quantum optics, and our predictions could be tested with current available experimental techniques.

arXiv comment9 pages, APS format

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• A Review of Perfect State Transfer and its Application as a Constructive Tool
• Scalable quantum computation via local control of only two qubits
• Entanglement dynamics in short and long-range harmonic oscillators
• State Transfer and Spin Measurement
• State transfer in dissipative and dephasing environments
• Freezing distributed entanglement in spin chains
• Formation probabilities and Shannon information and their time evolution after quantum quench in transverse-field XY-chain
• Spin Star as Switch for Quantum Networks
• Generation of GHZ and W states for stationary qubits in spin network via resonance scattering
• Quantum dynamics of magnetically controlled network for Bloch electrons
• Physical approach to quantum networks with massive particles
• Controllability in tunable chains of coupled harmonic oscillators
• Creating and preserving multi-partite entanglement with spin chains