Path Predictability and Quantum Coherence in Multi-Slit Interference

Abstract

In an asymmetric multislit interference experiment, a quanton is more likely to pass through certain slits than some others. In such a situation one may be able to predict which slit a quanton is more likely to go through, even without using any path-detecting device. This allows one to talk of path predictability. It has been shown earlier that for a two-slit interference, the predictability and fringe visibility are constrained by the inequality $P^2+V^2\le 1$. Generalizing this relation to the case of more than two slits is still an unsolved problem. A new definition for predictability for multi-slit interference is introduced. It is shown that this predictability and quantum coherence follow a duality relation $P^2+C^2\le 1$, which saturates for all pure states. For the case of two slits, this relation reduces to the previously known one.

arXiv commentExpanded, published version

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• Robustness of interferometric complementarity under Decoherence
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• The complementarity relations in a multi-path interferometer with quantum memory
• Bounds on positive operator-valued measure based coherence of superposition
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