Delayed Choice Classical Eraser Experiment

The main illustration above is a schematic of the Delayed choice quantum eraser experiment. (Kim et al 1999)

The coincidence rates compiled from the 5 detectors can be explained by a classical model. By assuming the following: The light arriving at D0, D3, and D4 is vertically and horizontally polarized. Alternating between the two states once per frequency cycle of the light beam. (Circular polarization is one possibility). Each polarized state has its own associated interference pattern. The image on the movable detector plane of D0 is of two, overlapping, out of phase interference patterns rapidly oscillating between each other. Once per frequency cycle of the light. The overall superimposed image of the two overlapping patterns, over time, is of no overall interference pattern. 

The lightbeams arriving at D1 and D2 have been additionally plane polarized. One vertical one horizontally. This also puts the horizontal out of phase by half a cycle, temporaly, from the vertical.Thus essentially, the detectors D1 and D2 each only recieve half of the light pulse that leaves the beam splitter. Either vertical or horizontally polarized. This allows detectors D1 and D2 to only trigger light detections coincident with a light detection from only one of the two rapidly oscillating interference patterns at D0. 

Detectors D3 and D4 on the other hand, receive both vertical and horizontal plarized light. And thus detectors D3 and D4 have coincident detections with both overlapping oscllating interference patterns at D0.

This is what is observed in the Kim et al experimental setup.

There is no need for a counterintuitive "quantum erasure". The observed coincidence rates are explained simply by polarization states of light incident on the 5 detectors.

(Sept2021 postscript: Ive noticed from some comments that a more detailed explanation is needed. Here is additional information: This experiment is as easily explained using classical wave only theory and polarised states. Light leaves the double slit/BBO/Glan Thompson prism with alternating polarity between vertical and horizontal.

(This is essentially circular polarised light. Because if the two beams going to detector zero werent alternating between horizontal and vertical polarised light each cycle and instead were just two same plane polarised beams as some pretend, then the two phase shifted interference patterns and diffraction patterns observed at detector 0 would not be possible) 

Detectors 1 and 2 get two light beams each. One beam reflected twice which means the light incident on each detector is a combination of left and right hand circular polarised light beams. Which can only result in plane polarised light hitting each detector 1&2.  (Note that if one combines a left handed circular polarised beam with a right handed circular polarised beam the combined result is a beam that alternates between two opposing polarised states and plane polarisation each cycle. That is effectively plane polarised light.

Because the D1 beams undergo opposite reflections at the mirrors and beam splitters from the D2 beams...the two detectors 1&2 thus also each receive polarised light that is phase shifted by half cycle from the other. Ie..vertical and horizontal respectively.

Detectors 3 and 4 only get one beam reflected once, each.(The one reflection restores the polarity of the beams from orthogonally polarised circular light leaving the BBO/G-T prism setup back to identically circular polarisation. Which means they get the same phase light as that arriving at detector zero. 

The resulting polarised states mean D1&2 each only “observe at Detector Zero” via the coincidence counter two seperate phase shifted interference patterns from the other .And detectors 3 & 4, having the same incident polarised light as detector zero , observe diffraction patterns via the coincidence counter. 

No spooky quantum mumbo jumbo  maths needed to explain this experiment.

And finally to address claims that the Glan Thompson prism used in the experiment cannot send circular polarised light beams to the rest of the experimental setup. Critics cite evidence showing that similar birefringement mediums such as calcite crystals split the beam into two orthogonally plane polarised beams. And using plane polarisation filters they show how the two exiting light beams must be only plane polarised. As a plane polarised filter put over the two images only allows through one of the two images coming through the calcite filter. 

However this ignores the fact that a vertically plane polarising filter allows through not just vertical polarised light...but all angles except horizontal. So for instance around 45% of the light polarised at 45 degrees to vertical is let through a vertically polarised filter. The more the polarisation angle of the light deviates from vertical the less light is let through etc.

In other words a circular polarised beam will be split into two polarised beams by the crystal one beam preserving majority vertical, one majority horizontal. But still containing elements of all other angles of polarisation. And thus the circular polarisation of the beam is preserved.

Proof of this is available at any demonstration showing unpolarised light going through two plane polarised filters. Position both filters at vertical and all vertically polarised light from a source goes through, and blocking all horizontal polarised light. Turn one filter slowly to horizontal and the light coming through decreases to zero as both vertical and horizontal light from the source are now blocked. Light coming through doesn’t immediately decrease to zero as soon as the two polarised filters angle starts to diverge. It is an incremental decrease. Proving a plane or linear polarising filter still lets through almost all angles of polarisation. But at different amplitudes. 

This is how one can explain how two circular polarised light beams can appear as two plane polarised beams exiting the Glan Thompson prism.

For further description of how this can be modelled as a classical effect only, watch the following...
https://www.youtube.com/watch?v=_KekfbrzO74

 

 

 

 

 

 

Supernova Light curves fit a non expanding model

Supernova (Sn1a) lightcurves have been used to illustrate time dilation due to the Big Bang expansion. This is an argument that has failed to follow a rigorous scientific method. The authors of these papers should have also tried to see if the observed lightcurve data fits a non expanding, z=0 model.  Using data from Knop et al 2003 I have created graphs of lightcurves where there is no expansion (z=0).  The following graphs are Knops dilated lightcurve graphs on the left and  for comparison, graphs of undilated fits on the right. These show how the data can also fit a non expanding model.