Entangled coherent states by mixing squeezed vacuum and coherent light

Abstract

Entangled coherent states are shown to emerge, with high fidelity, when mixing coherent and squeezed vacuum states of light on a beam-splitter. These maximally entangled states, where photons bunch at the exit of a beamsplitter, are measured experimentally by Fock-state projections. Entanglement is examined theoretically using a Bell-type nonlocality test and compared with ideal entangled coherent states. We experimentally show nearly perfect similarity with entangled coherent states for an optimal ratio of coherent and squeezed vacuum light. In our scheme, entangled coherent states are generated deterministically with small amplitudes, which could be beneficial, for example, in deterministic distribution of entanglement over long distances.

6 pages, 6 figures, comments are welcome

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• Heralded preparation of polarization entanglement via quantum scissors
• Describing squeezed-light experiments without squeezed-light states
• Atomic Inversion and Entanglement Dynamics for Squeezed Coherent Thermal States in the Jaynes-Cummings Model
• Engineering nonlinear boson-boson interactions using mediating spin systems