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Photon number-squeezed states are of significant value in fundamental quantumresearch and have a wide range of applications in quantum metrology. Most oftheir preparation mechanisms require precise control of quantum dynamics andare less tolerant to dissipation. We propose a mechanism that is not subject tothese restraints. In contrast to common approaches, we exploit theself-balancing between two types of dissipation induced by positive- andnegative-temperature reservoirs to generate steady states with sub-Poissonianstatistical distributions of photon numbers. We also show how to implement thismechanism with cavity optomechanical systems. The quality of the preparedphoton number-squeezed state is estimated by our theoretical model combinedwith realistic parameters for various typical optomechanical systems.

Optomechanical preparation of photon number-squeezed states with a pair of thermal reservoirs of opposite temperatures