Entanglement and Non-locality in a Micro-Macroscopic system

Abstract

In recent years two fundamental aspects of quantum mechanics have attracted a great deal of interest, namely the investigation on the irreducible nonlocal properties of Nature implied by quantum entanglement and the physical realization of the 'Schroedinger Cat'. In the present work a macro - state consisting of about 3.5 x 10^4 photons in a quantum superposition and entangled with a far apart single - photon state is generated. Then, the non-separability of the overall micro-macro system is demonstrated and the corresponding Bell's inequalities are found to be violated. Precisely, an entangled photon pair is created by a nonlinear optical process, then one photon of the pair is injected into an optical parametric amplifier operating for any input polarization state, i.e. into a phase-covariant cloning machine. Such transformation establishes a connection between the single photon and the multi particle fields. We then demonstrate the non-separability of the bipartite system by adopting a local filtering technique within a positive operator valued measurement.

12 pages, 11 figures

References in corpus (5)

• Progressive field-state collapse and quantum non-demolition photon counting
• Entangling Independent Photons by Time Measurement
• Experimental Analysis of a 4-Qubit Cluster State
• Quantum entanglement of a large number of photons
• Macroscopic Quantum Superposition and Entanglement in light reflection from Bose-Einstein Condensates