Unconventional Photon Blockade Based on Two-Photon Tunneling.

The study on the unconventional photon blockade mainly focus on Kerr nonlinearity. In this paper, we study the unconventional photon blockade based on another kind of nonlinearity, that is two-photon tunneling. The optimal conditions for strong antibunching are found by analytic calculations and numerical simulations, and the results are compared with the unconventional photon blockade based on Kerr nonlinearity, we find that the two-photon tunneling system has advantages for the larger antibunching area. Finally, we show that, after the symmetric-antisymmetric mode transformation, the two kinds of nonlinearities are equivalent from the perspective of photon antibunching. [ABSTRACT FROM AUTHOR]