Physics:Quantum delayed-choice quantum eraser
The delayed-choice quantum eraser is a Book I topic in the Quantum Collection. It is an interferometric experiment showing how which-path information and interference are related in quantum mechanics. In a quantum eraser arrangement, interference can be recovered when information that could identify the path is erased or made unavailable. The delayed-choice version emphasizes that the relevant correlations are defined by the full measurement arrangement, even when some choices are made after another part of the system has already been detected. The experiment is often used to discuss complementarity, entanglement, measurement, and the limits of classical causal pictures.
Overview
Placeholder: explain how delayed measurement choices can sort events into interference and non-interference patterns without changing past events.
Key ideas
Placeholder: cover entangled photons, which-path information, interference, coincidence counting, delayed measurement.
Experimental idea
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Which-path information
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Coincidence patterns
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Interpretation
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See also
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