Quantitative wave-particle duality and non-erasing quantum erasure

Details Quantitative wave-particle duality and non-erasing quantum erasure Quantitative wave-particle duality and non-erasing quantum erasure

1999-08-23

arxiv.org/abs/quant-ph/9908072v1

Physics

Quantum Physics

6 pages, 4 figures. To appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.60.4285

The notion of wave-particle duality may be quantified by the inequality V^2+K^2 <=1, relating interference fringe visibility V and path knowledge K. With a single-photon interferometer in which polarization is used to label the paths, we have investigated the relation for various situations, including pure, mixed, and partially-mixed input states. A quantum eraser scheme has been realized that recovers interference fringes even when no which-way information is available to erase.

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