Dear Dr. Weider,

I would like to suggest the following changes to address the points you have raised in your last email:

1. It is fine to remove the formulae for the singlet state. To accurately describe the state that was represented by the formulae, I would
   want to replace the word "singlet" with:

   "maximally-entangled singlet state"

2. I have added a short explanation to describe the terms |HV> and |VH>:

   "we had to carefully align the photon pair collection so that the two polarization contributions HV and VH were balanced."

   At start of the paragraph just before equation 3, I have included a definition of IF:

   "With interference filters (IF) of 5 nm bandwidth (FWHM) centered at 810 nm, we measured high visibilities of $99.9\pm0.1\%$ both in the $\pm$\,45$^\circ$ and the natural H/V linear polarization basis for the polarization correlations."

3. I have made the following changes to the caption of figure 2 to explain the y-axis:

   "The x-axis shows the year of the experiments while the y-axis shows the corresponding Bell violation S obtained."

4. I have appended the following statement to the end of the second to last paragraph before the acknowledgement to describe the next state of this research:

    "Given the implication this work, we want to see how much closer we can approach the Tsirelson bound. Currently we are trying to identify the sources of the errors and are working on ways to minimize them in order to achieve a tighter bound."

Some suggested changes that I have in mind are:

1. I would like to suggest for follow changes to statment right after eq 2. to indciationt that 2\sqrt(2) is an exact solution

In previous work, Boris Tsirelson3 has also shown that, according to quantum theory, $|S|$ has an upper bound of $2 \sqrt{2} (i.e. 2.82843...).

2. I would like to add another affiliation:

Hou Shun Poh, Siddarth K. Joshi, Alessandro Cer`e, and
Christian Kurtsiefer*
Centre for Quantum Technologies
*Department of Physics
National Univeristy of Singapore
Singapore, Singapore

Thank you.
    
Yours sincerely,
Hou Shun
