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Bulletin of the American Physical Society

True photon blockade effects with arbitrarily weak nonlinearities

Andrew Lingenfelter, David C K Roberts, Aashish A. Clerk

Published Mar 18, 2021• 0 citations
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We present a mechanism that harnesses extremely weak Kerr-type nonlinearities in a single driven cavity to deterministically generate single-photon Fock states and more general photon-blockaded states. Our method is effective even for nonlinearities that are orders-of-magnitude smaller than photonic loss. It is also completely distinct from so-called unconventional photon blockade mechanisms, as the generated states are non-Gaussian, exhibit a sharp cutoff in their photon number distribution, and can be arbitrarily close to a single-photon Fock state. Our ideas require only standard linear and parametric drives and are hence compatible with a variety of different photonic platforms.
In this paper, we show that photon blockade can be observed in a system with weak Kerr nonlinearities. The system consists of two spatially overlapping single-mode semiconductor cavities with tunable one- and two-photon tunneling. We find that both conventional and unconventional single-photon blockades are controllable by manipulating the phase in the hopping regardless of the weakness of nonlinearity. We refer to the photon blockade with weak nonlinearities as an unconventional photon blockade. The unconventional photon blockade effect originates from the destructive interference between different paths from the ground state to two-photon states. We analytically derive the exact optimal conditions for strong antibunching, which are in good agreement with those obtained by numerical simulations. The optimal parameters for photon blockade are derived. Based on these parameters, the semiconductor cavity systems can be used as a single-photon source in regimes of both weak and strong nonlinearities.
In this paper, we study the unconventional photon blockade of symmetric and antisymmetric modes in a photonic molecule system with bilateral drive. We show that the photon blockade effect is controllable by manipulating the tunnelling strength of two cavities and the ratio of driving strengths. Under the weak driving condition, we present the exact optimal conditions for strong antibunching photons. The optimal conditions are in good agreement with the numerical results. It is also found that the optimal value of detuning frequencies is not sensitive to the value of the ratio to achieve the unconventional photon blockade effect. The feasibility of tunable unconventional photon blockade effect also has been studied based on the experimental parameters. Our studies of the photonic molecule system can be used as a single-photon source based on the symmetric and antisymmetric modes in the regime of weak nonlinearity.