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- Tsegaye, T., et al.
(author)
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Complementarity and quantum erasure with entangled-photon states
- 2000
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In: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 62:3, s. art. no.-32106
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Journal article (peer-reviewed)abstract
- A quantum-erasure experiment was performed on superposition states of two photons in either of two spatiotemporal modes. Symmetrical tapping of energy from the two-mode state creates a four-mode entangled state. A direct measurement of one photon in two of the modes reveals the path of the second one, thereby eliminating the possibility of observing interference between the two remaining modes. It is shown that a unitary rotation of one of the two-mode states erases the path information; as a consequence, the visibility of the other two-mode state can be resurrected.
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| 2. |
- Tsegaye, T., et al.
(author)
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Experimental demonstration of three mutually orthogonal polarization states of entangled photons
- 2000
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In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 85:24, s. 5013-5017
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Journal article (peer-reviewed)abstract
- Linearly polarized classical light can be expressed in a vertical and a horizontal component. Geometrically rotating vertically polarized light by 90 degrees will convert it to the orthogonal horizontal polarization. We have experimentally generated a two-photon state of light which evolves into an orthogonal state upon geometrical rotation by 60 degrees. Rotating this state by an additional 60 degrees will yield a state which is mutually orthogonal to the first two states. Generalizing this procedure, one can generate N + 1 mutually orthogonal N-photon states that cyclicly evolve from one to another upon a geometric rotation by 180/(N + 1) degrees.
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