Scientific Results

Conditions for factorizable output from a beam splitter

Year: 2009

Authors: Springer S.C., Lee J., Bellini M., Kim M. S.

Autors Affiliation: School of Mathematics and Physics, Queen’s University, Belfast BT7 1NN, United Kingdom; Department of Physics, Hanyang University, Seoul 133-791, Korea; European Laboratory for Nonlinear Spectroscopy (LENS), Via Nello Carrara 1, 50019 Sesto Fiorentino, Florence, Italy; Instituto Nazionale di Ottica Applicata (CNR), Largo E. Fermi, 6, I-50125 Florence, Italy

Abstract: A beam splitter is one of the most important devices in an optics laboratory because of its handiness and versatility; equivalent devices are found in various quantum systems to couple two subsystems or to interfere them. While it is normal that two independent input fields are superposed at the beam splitter to give correlated outputs, identical Gaussian states interfere there to produce totally independent output fields. We prove that the Gaussian states with same variances are the only states which bring about factorizable output fields.

Journal/Review: PHYSICAL REVIEW A

Volume: 79 (6)      Pages from: 062303  to: 062303

More Information: We acknowledge financial support from Northern Ireland\’s Department for Employment and Learning, Korea Research Foundation Grant funded by the Korean Government (Grant No. KRF-2008-313-C00188), Ente Cassa di Risparmio di Firenze and CNR-RSTL, and EPSRC.
KeyWords: Beam splitters; Gaussian state; Input field; Optics laboratory; Quantum system, Optical beam splitters; Optical instruments; Particle beams; Prisms; Quantum electronics; Quantum optics, Gaussian beams; quantum state; fields; distributions
DOI: 10.1103/PhysRevA.79.062303

Citations: 9
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