Quantum coherent control of Gaussian multipartite entanglement

摘要: Quantum information has reached a stage where real-world applications stimulate an intense research for the implementation of reliable and practical protocols quantum communication processing. The such protocols, though, requires distributing correlations (entanglement) among number degrees freedom (modes) increasing with complexity task to achieve. In large-number-of-modes regime, most promising example is probably one-way computation in which achieved by applying local measurements set modes initially cluster state [1]. However generation multipartite entangled states experimental configurations whose increases involved means optical devices. contrast, source should be compact, scalable, permit master properties generated even when very large. We introduce general approach arbitrary Gaussian based on use naturally multimode parametric down-conversion processes, either spatial or temporal domain, single pass devices cavity advantage this scheme relies fact that can easily controlled experimentally accessible parameter. dynamics interactions low-gain regime described linear operator couples different relevant modes.