Extraction of Singlet States from Noninteracting High-Dimensional Spins (original) (raw)

2008, Physical Review Letters

We present a scheme for the extraction of singlet states of two remote particles of arbitrary quantum spin number. The goal is achieved through post-selection of the state of interaction mediators sent in succession. A small number of iterations is sufficient to make the scheme effective. We propose two suitable experimental setups where the protocol can be implemented. Achieving control at the quantum level is a pivotal requirement for the grounding of quantum technology and the development of reliable protocols for information processing. Frequently, state-manipulation of a quantum device needs the connection of remote nodes of a network and the creation of their entangled state. Such a delocalized architecture has received strong experimental attention, especially at the quantum optics level. Heralded entanglement of remote atomic ensembles or individuallytrapped ions has been produced and atom-photon entanglement has been observed [1]. The transfer of prebuilt entanglement to distant systems has been proposed as a way to distribute quantum channels .

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