Entangler and analyzer for multiphoton maximally entangled states using weak nonlinearities

Abstract

In the regime of weak nonlinearity we present two general feasible schemes. One is an entangler for generating any one of the $n$-photon Greenberger-Horne-Zeilinge (GHZ) states and Bell states. After the interactions with cross-Kerr nonlinear media, a phase gate followed by a measurement on the probe beam, and appropriate local operations via classical feed-forward, one can obtain the desired states in a nearly deterministic way. Another scheme is an analyzer for multiphoton maximally entangled states, which is taken as a further application of the above entangler. In this scheme, all of the $2^n$ $n$-photon GHZ states can, nearly deterministically, be discriminated. Furthermore, an efficient two-step nondestructive Bell-state analyzer is designed.

7 pages, 6 figures

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Cited by in corpus (7)

• Preparation of $km$-photon concatenated GHZ states for observing distinct quantum effects at macroscopic scale
• Exploration of photon-number entangled states using weak nonlinearities
• Preparation and purification of four-photon Greenberger-Horne-Zeilinger state
• Violation of generalized Bell inequality and its optimal measurement settings
• Scalable Bell inequalities for multiqubit systems
• Scalable symmetry detector and its applications by using beam splitters and weak nonlinearities
• On six-photon entangled state emitted from a single third-order parametric down-conversion process