Path-phase duality of an interfering particle with translational-internal entanglement

Details Path-phase duality of an interfering particle with translational-internal entanglement Path-phase duality of an interfering particle with translational-internal entanglement

2007-05-29

arxiv.org/abs/0705.4177v1

New J. Phys. 9 (2007) 129

Physics

Quantum Physics

14 pages, 5 figures

Scientific paper

10.1088/1367-2630/9/5/129

The aim of this paper is to revisit the implications of complementarity when we inject into a Mach Zehnder interferometer particles with internal structure, prepared in special translational-internal entangled (TIE) states. This correlation causes the path distinguishability to be phase dependent in contrast to the standard case. We show that such a TIE state permits us to detect small phase shifts along with almost perfect path distinguishability, beyond the constraints imposed by complementarity on simultaneous which-way and which-phase measurements for standard cases (when distinguishability is independent of interferometric phase).

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