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Creating and detecting micro-macro photon-number entanglement by amplifying and de-amplifying a single-photon entangled state

We propose a scheme for the observation of micro-macro entanglement in photon number based on amplifying and de-amplifying a single-photon entangled state in combination with homodyne quantum state tomography. The created micro-macro entangled state, which exists between the amplification and de-amplification steps, is a superposition of two components with mean photon numbers that differ by approximately a factor of three. We show that for reasonable values of photon loss it should be possible to detect micro-macro photon-number entanglement where the macro system has a mean number of one hundred photons or more.

preprint2012arXivOpen access
Roohollah GhobadiAlexander LvovskyChristoph Simon
quant-ph
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Open access3 authors1 topic
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Roohollah GhobadiAlexander LvovskyChristoph Simon

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