Ah? If you read my previous posts it should be perfectly clear that my point has been all along that the correlation between those two instruments is not stable. I am repeating that the correlation between USDJPY and US yields is not related at all to BoJ's QE program. Of course did the program have an impact on certain assets but there is no direct relationship between the two topics.
Let's assume you are right, the correlation isn't at all related to the QE program. And that this correlation isn't stable. That's definitely correct, but before you said there are fundamental reasons for this correlation. User Martinghoul mentioned yield spreads, and curvature. What does that exactly mean?