Indistinguishability of orbital angular-momentum modes in spontaneous parametric down-conversion

Journal Article · Fri May 15 04:00:00 EDT 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.79.055805· OSTI ID:21313159

Barbosa, Geraldo Alexandre ^[1]

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1. Department of Electrical Engineering and Computer Science, Center for Photonic Communication and Computing, Northwestern University, 2145 North Sheridan Road, Evanston, Illinois 60208-3118 (United States)

Identification of light modes usually requires careful considerations of the collecting geometry. This is particularly true for states carrying orbital angular-momentum modes from spontaneous parametric down-conversion due to the entanglement of the signal and idler fields. A detailed understanding of the generated modes in a general case allows the design of efficient detection setups. This is true for distinct cases, e.g., when multiple samplings are performed by repeated state generation or in single-photon cryptography or quantum computation, where a photon state is generated within a short-time window and a single measurement is performed. Aspects of nonorthogonality of signal and idler modes and effects of restrictions on the collecting geometry are discussed in this work.

• OSTI ID: 21313159
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 79; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONVERSION
CRYPTOGRAPHY
DESIGN
DETECTION
GEOMETRY
ORBITAL ANGULAR MOMENTUM
PHOTONS
QUANTUM COMPUTERS
QUANTUM ENTANGLEMENT
SIGNALS
VISIBLE RADIATION
WINDOWS