Amplification of Quantum Entanglement
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12 Hilbert space the quantum entanglement and superposition properties of the photon couples generated by parametric downconversion. The structure of the Wigner function and of the field’s correlation functions shows a decoherence-free multiphoton Schroedinger-cat behavior of the emitted field which is largely detectable against the squeezed-vacuum noise. [S0031-9007(98)07189-0]