Table 2 Comparison of concurrence and S parameter of our source with other sources of polarization-entangled photons.

This work

χ⁽³⁾, dual

AlGaAs

0.91 ± 0.01

0.97 ± 0.01

2.78 ± 0.01^a

Lv et al.²¹

χ⁽³⁾, dual

Si

—

—

2.59 ± 0.12^b

Matsuda et al.¹⁹

χ⁽³⁾, single

Si

0.88 ± 0.02

—

—

Olislager et al.¹⁸

χ⁽³⁾, single

Si

—

—

2.37 ± 0.19

Kang et al.³⁷

χ⁽²⁾

AlGaAs

0.92 ± 0.03

0.98 ± 0.01

2.65^b

Orieux et al.¹⁵

χ⁽²⁾

AlGaAs

0.68 ± 0.01

0.75 ± 0.03

2.23 ± 0.01