Optical qudit-type entanglement creation at long distances by means of small cross-Kerr nonlinearities

Journal Article · Sun May 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.052303· OSTI ID:21546720

Kilin, S Ya; Mikhalychev, A B ^[1]

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1. B. I. Stepanov Institute of Physics NASB, Minsk (Belarus)

Entanglement represents an important resource for quantum information processing, but its generation itself requires physical resources that are limited. We propose a scheme for generating a wide class of entangled qudit-type states of optical field modes at sites separated by noisy medium when only weak optical nonlinearities are available at both sites. The protocol is also based on exploiting a weak probe field, transmitted between the sites and used for generation of quantum correlations between two spatially separated field modes. The idea of probabilistic entanglement enhancement by measurement is discussed and a corresponding scheme for measuring the probe field state with linear optics and photodetectors not resolving photon numbers is proposed. It is shown that the protocol is applicable in the case when limited efficiency and dark counts of photodetectors, decoherence, and uncertainty of nonlinear coupling constants are present.

• OSTI ID: 21546720
• Journal Information: Physical Review. A, Vol. 83, Issue 5; Other Information: DOI: 10.1103/PhysRevA.83.052303; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COUPLING CONSTANTS
DISTANCE
KERR EFFECT
NONLINEAR PROBLEMS
OPTICS
PHOTODETECTORS
PHOTONS
PROBABILISTIC ESTIMATION
PROCESSING
QUANTUM DECOHERENCE
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION
QUANTUM STATES
BOSONS
CALCULATION METHODS
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
INFORMATION
MASSLESS PARTICLES
PHYSICAL PROPERTIES