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We show that in laser-driven coupled optomechanical systems, photonantibunching can occur under weak optomechanical coupling, contrarily to commonexpectation. This unconventional photon blockade originates from destructivequantum interference between different excitation pathways bringing from theground to two-photon states. Using a quantum open-system approach, we study theantibunching as a function of driving field amplitude, temperature, and puredephasing rate, and derive optimal values of the system parameters for itsoccurrence. These values are remarkably close to those characterizingoptomechanical systems in some current experimental studies.

Unconventional photon blockade in coupled optomechanical systems