Generation of hybrid entanglement of light

Year: 2014

Authors: Jeong H., Zavatta A., Kang M., Lee S.-W., Costanzo L. C., Grandi S., Ralph T. C., Bellini M.

Autors Affiliation: Center for Macroscopic Quantum Control, Department of Physics and Astronomy, Seoul National University, Seoul, 151-742, Korea; Istituto Nazionale di Ottica (INO-CNR), Largo Enrico Fermi 6, 50125 Florence, Italy; LENS and Department of Physics, University of Firenze, 50019 Sesto Fiorentino, Florence, Italy; Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland, Queensland 4072, Australia Centre for Cold Matter, Blackett Laboratory, Imperial College London, London SW7 2AZ, UK

Abstract: Entanglement between quantum and classical objects is of special interest in the context of fundamental studies of quantum mechanics and potential applications for quantum information processing. In quantum optics, single photons are treated as light quanta while coherent states are considered the most classical of pure states. Recently, entanglement between a single photon and a coherent state in a free-travelling field was identified as a useful resource for optical quantum information processing. However, the extreme difficulty involved in generating such states was highlighted, as it requires clean cross-Kerr nonlinearities. Here, we devise and experimentally demonstrate a scheme to generate such hybrid entanglement by implementing a superposition of two distinct quantum operations. The generated states clearly show entanglement between the two different types of states. Our work opens the way to the generation of hybrid entanglement of greater size and the development of efficient quantum information processing using a new type of qubit.

Journal/Review: NATURE PHOTONICS

Volume: 8 (7)      Pages from: 564  to: 569

More Information: A.Z., L. S. C., S. G. and M. B. acknowledge support from the European Union under the CHIST-ERA (European Coordinated Research on Long-term Challenges in Information and Communication Sciences & Technologies ERA-Net) project QSCALE (Quantum Technologies for Extending the Range of Quantum Communications) and from the Italian Ministry of Education, University and Research under the FIRB (Fondo per gli Investimenti della Ricerca di Base; contract no. RBFR10M3SB). H. J., M. K. and S.-W. L. were supported by the National Research Foundation of Korea (grant no. 2010-0018295) funded by the Ministry of Science, ICT and Future Planning of Korea. T. C. R. acknowledges support from the Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology (project no. CE110001027).
KeyWords: Photons; Quantum optics, Classical object; Coherent state; Cross-Kerr nonlinearities; Fundamental studies; Optical quantum-information processing; Quantum operations; Quantum-information processing; Single photons, Quantum entanglement
DOI: 10.1038/NPHOTON.2014.136

ImpactFactor: 32.386
Citations: 158
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