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AIP conference proceedings

Einstein Podolsky Rosen correlations involving mesoscopic quantum systems

Marco B. Caminati

Published Jan 1, 2006• 0 citations
Publisher

Abstract

We investigate multiphoton states generated by high‐gain optical parametric amplification of a single injected photon, polarization encoded as a “qubit”. Two different experimental configurations were adopted in order to investigate two different quantum processes: the optimal universal quantum cloning and the optimal phase‐covariant cloning. The output states of the two apparatuses were found to show the quantum superposition property of mesoscopic multi‐photon assemblies and the entanglement characteristics of the “Schroedinger Cat State”. This work represents an experimental attempt to test several fundamental quantum processes in a mesoscopic, or macroscopic frameworks. As it is well known, this is indeed one of the most challenging endavours of modern science.

DOI
10.1063/1.2219351

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•Jan 1, 2004•0 citations
We investigate multiphoton states generated by high‐gain optical parametric amplification of a single injected photon, polarization encoded as a “qubit”. Two different experimental configurations were adopted in order to investigate two different quantum processes: the optimal universal quantum cloning and the optimal phase‐covariant cloning. The output states of the two apparatuses were found to show the quantum superposition property of mesoscopic multi‐photon assemblies and the entanglement characteristics of the “Schroedinger Cat State”. This work represents an experimental attempt to test several fundamental quantum processes in a mesoscopic, or macroscopic frameworks. As it is well known, this is indeed one of the most challenging endavours of modern science.
We investigate multiphoton states generated by high-gain optical parametric amplification of a single injected photon—polarization encoded as a qubit. The experimental configuration exploits the optimal phase-covariant cloning. The output state of the apparatus is found to exhibit the quantum superposition property of mesoscopic multiphoton assemblies involving about 300 photons. This work represents an experimental advance toward the test of several fundamental quantum processes in mesoscopic or macroscopic frameworks.
We investigate the multiphoton states generated by high-gain optical parametric amplification of a single injected photon, polarization encoded as a "qubit". The experiment configuration exploits the optimal phase-covariant cloning in the high gain regime. The interference fringe pattern showing the non local transfer of coherence between the injected qubit and the mesoscopic amplified output field involving up to 4000 photons has been investigated. A probabilistic new method to extract full information about the multiparticle output wavefunction has been implemented. This technique can be adopted to test the entanglement between a microscopic system and a macro one.
We investigate the multiphoton states generated by high-gain optical parametric amplification of a single injected photon, polarization encoded as a ``qubit.'' The experiment configuration exploits the optimal phase-covariant cloning in the high gain regime. The interference fringe pattern showing the nonlocal transfer of coherence between the injected qubit and the mesoscopic amplified output field involving up to 4000 photons has been investigated. A probabilistic method to extract full information about the multiparticle output wave function has been implemented.
We investigate the multiparticle quantum superposition and the persistence of bipartite entanglement of the output field generated by the quantum injected high-gain optical parametric amplification of a single photon. The physical configuration based on the optimal universal quantum cloning has been adopted to investigate how the entanglement and the quantum coherence of the system persists for large values of the nonlinear parametric gain ggg.
We report the successful generation of an entangled multiparticle quantum superposition of pure photon states. They result from a multiple universal cloning of a single photon qubit by a high gain, quantum-injected parametric amplifier. The information preserving property of the process suggests for these states the name of ”multi-particle qubits”. They are ideal objects for investigating the emergence of the classical world in quantum systems with increasing complexity, the decoherence processes and may allow the practical implementation of the universal 2-qubit logic gates. Typeset using REVTEX 1 Since the golden years of quantum mechanics the interference of classically distinguishable quantum states, first epitomized by the famous ”Schroedinger-Cat ” apologue [1] has been the object of extensive theoretical studies and recognized as a major conceptual paradigm of Physics [2,3]. In modern times the sciences of quantum information (QI) and quantum computation deal precisely with collective processes involving a multiplicity of