Multiparticle Quantum Superposition and Stimulated Entanglement by Parity Selective Amplification of Entangled States

Francesco De Martini; Giovanni Di Giuseppe; Sebastião Pádua

doi:10.1103/PhysRevLett.87.150401

Multiparticle Quantum Superposition and Stimulated Entanglement by Parity Selective Amplification of Entangled States

Francesco De Martini, Giovanni Di Giuseppe, and Sebastião Pádua

Phys. Rev. Lett. 87, 150401 – Published 25 September 2001

Abstract

We report the creation of an entangled multiphoton quantum superposition by quantum injection of entangled 2-photon states into a parity selective parametric amplifier. The information preserving property of the state transformation suggests for these macrostates the name of large qubits. They are ideal objects for investigating the emergence of the classical world in complex quantum systems and have relevant new applications in quantum information.

Received 3 August 2000

DOI:https://doi.org/10.1103/PhysRevLett.87.150401

Authors & Affiliations

Francesco De Martini, Giovanni Di Giuseppe^*, and Sebastião Pádua^†

Dipartimento di Fisica and Istituto Nazionale di Fisica della Materia, Universitá “La Sapienza,” Roma 00185, Italy

^*Permanent address: Department of Electrical Engineering, Boston University, Boston, Massachusetts 02215
^†Permanent address: Departamento de Física, Universidade Federal de Minas Gerais, Caixa Postal 702, Belo Horizonte, MG 30123-970, Brazil