Realization of a Decoherence-free, Optimally Distinguishable Mesoscopic Quantum Superposition

Abstract

We report the realization of an entangled quantum superposition of M=12 photons by a high gain, quantum-injected optical parametric amplification. The system is found so highly resilient against decoherence to exhibit directly accessible mesoscopic interference effects at normal temperature. By modern tomographic methods the non-separability and the quantum superposition are demonstrated for the overall mesoscopic output state of the dynamic ''closed system''. The device realizes the condition conceived by Erwin Schroedinger with his 1935 paradigmatic ''Cat'' apologue, a fundamental landmark in quantum mechanics.

10 pages, 3 figures

References in corpus (9)

• Separability Criterion for Density Matrices
• Experimental Quantum Cloning of Single Photons
• Entanglement of a Mesoscopic Field with an Atom induced by Photon Graininess in a Cavity
• Quantum entanglement of a large number of photons
• Contextual, Optimal and Universal Realization of the Quantum Cloning Machine and of the NOT gate
• Contextual Realization of the Universal Quantum Cloning Machine and of the Universal-NOT gate by Quantum Injected Optical Parametric Amplification
• Violation of multi-particle Bell inequalities for low and high flux parametric amplification using both vacuum and entangled input states
• Multiparticle Quantum Superposition and Stimulated Entanglement by Parity Selective Amplification of Entangled States
• Resilience of multi-photon entanglement under losses

Cited by in corpus (19)

• Schroedinger Cat: Entanglement test in a Micro-Macroscopic system
• Experimental macroscopic coherence by phase-covariant cloning of a single photon
• Phase-sensitive Manipulations of Squeezed Vacuum Field in an Optical Parametric Amplifier inside an Optical Cavity
• Investigating macroscopic quantum superpositions and the quantum-to-classical transition by optical parametric amplification
• Wigner-function theory and decoherence of the quantum-injected optical parametric amplifier
• Multi-qubit entanglement engineering via projective measurements
• Criteria for generalized macroscopic and mesoscopic quantum coherence
• Towards quantum frequency combs: boosting the generation of highly nonclassical light states by cavity-enhanced parametric down-conversion at high repetition rates
• Non separable Werner states in spontaneous parametric down-conversion
• Entanglement criteria for microscopic-macroscopic systems
• Decoherence, Einselection and Classicality of a Macroscopic Quantum Superposition generated by Quantum Cloning
• Anomalous lack of decoherence of the Macroscopic Quantum Superpositions based on phase-covariant Quantum Cloning
• Decoherence in a system of many two--level atoms
• Coherent scattering of a Multiphoton Quantum Superposition by a Mirror-BEC
• Entanglement, EPR correlations and mesoscopic quantum superposition by the high-gain quantum injected parametric amplification
• Anomalous resilient to decoherence macroscopic quantum superpositions generated by universally covariant optimal quantum cloning
• Entanglement and Non-locality in a Micro-Macroscopic system
• Spontaneous Breaking of the Quantum Superposition
• Reality, locality and all that: "experimental metaphysics" and the quantum foundations