This is an experiment in which we wish to detect the presence of a bomb B without detonating it. However, the bomb will automatically detonate even if only a single photon hits it. One might intuitively think such detection is impossible, because in order to see something, one needs to shine light at it. However, turns out this is in fact possible and here's how.
This outcome is a consequence of the fact that insignificantly small amount of light lost in one of the arms will prevent a large amount of light from rotating over a large number of circulations which would detonate the bomb. This works simply due to the fact that the lost light compared to the total in each rotation is insignificant compared to the rotation. While the polarisation is rotated by A, it's not difficult to see that loss becomes insignificant respect to A as A becomes small. Never the less, it is the elimination of this small signal which prevents the rotation from accumulating and consequently makes detection without large interaction possible. It is also closely related to quantum Zeno effect.
|Rotation by 1 degree|
This paper [http://arxiv.org/pdf/1609.04050.pdf] seems to be of the opinion that the universe is discrete and finite. I'm sure some people find it pleasing.
It is suggested that quantum entanglement emerges from the holographic principle stating that all of the information of a region (bulk bits) can be described by the bits on its boundary surface. There are redundancy and information loss in the bulk bits that lead to the nonlocal correlation among the bulk bits. Quantum field theory overestimates the independent degrees of freedom in the bulk. [https://arxiv.org/pdf/1109.3542v1.pdf]