Generation of modal- and path-entangled photons using a domain-engineered integrated optical waveguide device

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.062333· OSTI ID:21550083

Lugani, Jasleen; Ghosh, Sankalpa; Thyagarajan, K ^[1]

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1. Department of Physics, Indian Institute of Technology Delhi, New Delhi 110 016 (India)

Integrated optical devices are expected to play a promising role in the field of quantum information science and technology. In this paper we propose a scheme for the generation of nondegenerate, copolarized, modal, and path-entangled photons using a directional coupler and an asymmetric Y-coupler geometry in type-0 phase-matched domain-engineered lithium niobate (LN) waveguide. The nonlinearity in LN is tailored in such a way that quasi-phase-matching conditions for two different spontaneous parametric down-conversion processes are obeyed simultaneously, leading to a modal and path-entangled state at the output. Assuming typical values of various parameters, we show, through numerical simulations, that an almost maximally entangled state is achievable over a wide range of waveguide parameters. For the degenerate case, the proposed scheme gives a NOON state for N = 2. The generated entangled photon pairs should have potential applications in quantum information schemes and also in quantum metrology. By appropriate domain engineering and component designing, the idea can be further extended to generate hyperentangled and two-photon multipath-entangled states, which may have further applications in quantum computation protocols.

• OSTI ID: 21550083
• Journal Information: Physical Review. A, Vol. 83, Issue 6; Other Information: DOI: 10.1103/PhysRevA.83.062333; (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
ASYMMETRY
COMPUTERIZED SIMULATION
CONVERSION
LITHIUM COMPOUNDS
NIOBATES
NONLINEAR PROBLEMS
OPTICAL EQUIPMENT
PHOTONS
QUANTUM COMPUTERS
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION
WAVEGUIDES
ALKALI METAL COMPOUNDS
BOSONS
COMPUTERS
ELEMENTARY PARTICLES
EQUIPMENT
INFORMATION
MASSLESS PARTICLES
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SIMULATION
TRANSITION ELEMENT COMPOUNDS