Fig. 3: Coincidence measurements from r-BN in different measurement bases.
From: A tunable entangled photon-pair source based on a Van der Waals insulator
a, b, c Coincidence counts measured from the r-BN when the pump field aligns with the zigzag direction, with measurement basis are along the a horizontal-vertical (H-V), b diagonal-antidiagonal (D-A), and c right-left (R-L) basis. These results indicate the Bell state \(\frac{1}{\sqrt{2}}(|HV\rangle+|VH\rangle )\). d, e, f Coincidence counts measured from the r-BN when pump field aligns with the armchair direction, with measurement basis are along the (d) horizontal-vertical (H-V), e diagonal-antidiagonal (D-A), and f right-left (R-L) basis. These results indicate the Bell state \(\frac{1}{\sqrt{2}}(|HH\rangle-|VV\rangle )\).
