title: Creating and detecting micro-macro photon-number entanglement by amplifying and deamplifying a single-photon entangled state.
abstract: We propose a scheme for the observation of micro-macro entanglement in photon number based on amplifying and deamplifying a single-photon entangled state in combination with homodyne quantum state tomography. The created micro-macro entangled state, which exists between the amplification and deamplification 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 macrosystem has a mean number of one hundred photons or more.
authors.affiliation: Institute for Quantum Information Science and Department of Physics and Astronomy, University of Calgary, Calgary T2N 1N4, Alberta, Canada.
authors.forename: Roohollah
authors.initials: R
authors.lastname: Ghobadi
authors.forename: Alexander
authors.initials: A
authors.lastname: Lvovsky
authors.forename: Christoph
authors.initials: C
authors.lastname: Simon