Realization of an Optimally Distinguishable Multiphoton Quantum Superposition

2005/08/29 by F. De Martini, Francesco De Martini, Fabio Sciarrino +1 · 1 citation
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum optics and atomic interactions #quant-ph

paper · pdf · doi:10.1103/physrevlett.95.240401

published as Phys. Rev. Lett. 95, 240401 (2005) · 10 pages, 3 figures

arxiv created 2005/08/29 · openalex publication_date 2005/12/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report the realization of an entangled quantum superposition of M approximately 12 photons by multiple universal cloning of a single-photon qubit via the high gain, quantum-injected optical parametric amplification. The system has been found extremely resilient to decoherence. By quantum tomography, the nonseparability and the quantum superposition are demonstrated for the mesoscopic output state of the dynamic "closed system."

Citations

• Quantum Entanglement of a Large Number of Photons
• Separability Criterion for Density Matrices
• Die gegenw�rtige Situation in der Quantenmechanik
• Contextual, Optimal, and Universal Realization of the Quantum Cloning Machine and of the NOT Gate

Cited by

• Phase-Sensitive Manipulations of a Squeezed Vacuum Field in an Optical Parametric Amplifier inside an Optical Cavity