U1 10

Combined polarisation measurement of Alice and Bob – Alice‘s and Bobs correlation function

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Alice‘s and Bobs correlation function

Determining the correlation between two doors.
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Depending upon the angle of the polarisation rotators, one of the four possibilities (□□, □■, ■□, ■■) is realized in each measurement. Alice and Bob can, independently from one another, choose the measurement basis with their polarization rotator.

Let us now determine the correlation function between the random patterns of Alice and Bob. In the case of a parallel position, the measurement results are identical, and thus fully correlated. At 45°, the measurements are uncorrelated. At 90°, they are anti-correlated.

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