EnEtanglement by a beamsplitter: Nonclassicality as a prerequisite for entanglement

KIM, Myungshik, W. SON, Vladimír BŮŽEK and Peter KNIGHT. EnEtanglement by a beamsplitter: Nonclassicality as a prerequisite for entanglement. Physical Review A. New York: American Physical Society, 2002, vol. 65, No 03, p. 032323-1;02323-7, 7 pp. ISSN 1050-2947.

Basic information

• Original name: EnEtanglement by a beamsplitter: Nonclassicality as a prerequisite for entanglement
• Authors: KIM, Myungshik (410 Republic of Korea), W. SON (410 Republic of Korea), Vladimír BŮŽEK (703 Slovakia, guarantor) and Peter KNIGHT (826 United Kingdom of Great Britain and Northern Ireland).
• Edition: Physical Review A, New York, American Physical Society, 2002, 1050-2947.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10301 Atomic, molecular and chemical physics
• Country of publisher: United States of America
• Confidentiality degree: is not subject to a state or trade secret
• Impact factor: Impact factor: 2.986
• RIV identification code: RIV/00216224:14330/02:00007537
• Organization unit: Faculty of Informatics
• Keywords in English: quantum information; entanglement; linear optical elements
• Tags: ENTANGLEMENT, linear optical elements, quantum information

Abstract

A beam splitter is a simple, readily available device which can act to entangle the output optical fields. We show that a necessary condition for the fields at the output of the beam splitter to be entangled is that the pure input states exhibit nonclassical behavior. We generalize this proof for arbitrary (pure or impure) Gaussian input states. Specifically, nonclassicality of the input Gaussian fields is a necessary condition for entanglement of the field modes with the help of the beam splitter. We conjecture that this is a general property of the beam splitter: Nonclassicality of the inputs is a necessary condition for entangling fields in the beam splitter.

Links

• GA201/98/0369, research and development project: Name: Informatika jako třetí metodologie

Investor: Czech Science Foundation, Informatics as the third methodology

• MSM 143300001, plan (intention): Name: Nesekvenční modely výpočtů - kvantové a souběžné distribuované modely výpočetních procesů

Investor: Ministry of Education, Youth and Sports of the CR, Non-sequential Models of Computing -- Quantum and Concurrent Distributed Models of Computing