Creating and Detecting Micro-Macro Photon-Number Entanglement by Amplifying and Deamplifying a Single-Photon Entangled State
Roohollah Ghobadi, Alexander I. Lvovsky, Christoph Simon · Physical Review Letters · 2013
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.