Applied Physics Letters

Integrated source of tunable nonmaximally mode-entangled photons in a domain-engineered lithium niobate waveguide

Yang Ming, Zijian Wu, Guoxin Cui, Ai-hong Tan, Fei Xu, Yanqing Lu

Published Apr 28, 2014• 9 citations

Abstract

The nonmaximally entangled state is a special kind of entangled state, which has important applications in quantum information processing. It has been generated in quantum circuits based on bulk optical elements. However, corresponding schemes in integrated quantum circuits have been rarely considered. In this Letter, we propose an effective solution for this problem. An electro-optically tunable nonmaximally mode-entangled photon state is generated in an on-chip domain-engineered lithium niobate (LN) waveguide. Spontaneous parametric down-conversion and electro-optic interaction are effectively combined through suitable domain design to transform the entangled state into our desired formation. Moreover, this is a flexible approach to entanglement architectures. Other kinds of reconfigurable entanglements are also achievable through this method. LN provides a very promising platform for future quantum circuit integration.

DOI: 10.1063/1.4874838

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Applied Physics Letters

Integrated source of tunable nonmaximally mode-entangled photons in a domain-engineered lithium niobate waveguide

Yang Ming, Zijian Wu, Guoxin Cui, Ai-hong Tan, Fei Xu, Yanqing Lu

Published Apr 28, 2014• 9 citations

Publisher

Abstract

DOI: 10.1063/1.4874838

Related papers

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\mathsf{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.