Quantitative conditional quantum erasure in two-atom resonance fluorescence

Details Quantitative conditional quantum erasure in two-atom resonance fluorescence Quantitative conditional quantum erasure in two-atom resonance fluorescence

2002-06-28

arxiv.org/abs/quant-ph/0206200v2

Phys. Rev. A 66, 062107 (2002)

Physics

Quantum Physics

Revtex4, 12pages, 4 eps figures, replaced with published version, changes in Sec. 3, to appear in Physical Review A

Scientific paper

10.1103/PhysRevA.66.062107

We present a conditional quantum eraser which erases the a priori knowledge or the predictability of the path a photon takes in a Young-type double-slit experiment with two fluorescent four-level atoms. This erasure violates a recently derived erasure relation which must be satisfied for a conventional, unconditional quantum eraser that aims to find an optimal sorting of the system into subensembles with particularly large fringe visibilities. The conditional quantum eraser employs an interaction-free, partial which-way measurement which not only sorts the system into optimal subsystems with large visibility but also selects the appropriate subsystem with the maximum possible visibility. We explain how the erasure relation can be violated under these circumstances.

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