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If lambda would be a function of different length of signal path and idler path we might set it to zero by precisely measured distances. But is it really a function of distance difference and frequency of used photons? Because Scully et al used linear polarised laser beam as quantum well laser. I guess lambda is related just to change of direction of ...


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1) Lamda shift is only caused by the the path differences (length, phase delay) in the 2 interference arms (idler) and these path differences are entangled with the path differences measured at D0 because the 2 photons shared a common wave function. 2) I think to cause interference you need idler paths or paths. 3) Yes there would be no interference, you ...


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The experiment is likely not performing as claimed. Most slit experiments polarize before the slits and the laser should be highly polarized to begin with. Typically half the photons are absorbed for unpolarized light at a polarizer, these are collapsed. The transmitted photons have the same wave function all the way through. Probably 100% of the photons ...


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In the quantum eraser experiment, nothing is measured: If the which-way information would be measured, the interference would indeed be irreversibly gone. Rather, what is happening is that the which-way information is copied to another quantum system. If that system is measured (or just ignored - which means it could still be measured), the interference ...


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So in the quantum eraser experiment you essentially have 3 qubits. When you measure one of them, it is no longer entangled with the other two, but rather the results of your measurement must color your understanding of the quantum state of those other two qubits, and the results of another measurement must color your understanding of the quantum state of the ...


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Assertion 2b is incorrect. It does not matter whether the polarisation is detected or not. If the the two slots pass orthogonal polarisation only, there is no interference.


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It seems an answer might have been given in the comments, but I will try to add a bit. When it comes to "which way" information and interference patterns, I find the most clear and instructive example to be the delayed choice quantum eraser experiment. It sounds similar to the case you describe in points 4 and 5. Diagram from Kim et al's paper. In its most ...


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