Entanglement of movable mirrors in a correlated-emission laser
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We propose an experimental scheme for entangling two macroscopic mechanical resonators (movable mirrors) by their coupling to the two-mode fields of a correlated-emission laser inside a doubly resonant cavity. With this aim we investigate the quantum Langevin equations that describe the interaction of the field-mirror system in conjuction with the master equation of the correlated-emission laser. We show that the steady-state entanglement of two mirrors as well as that of two-mode fields can be obtained in the regime of strong field-mirror coupling when the input lasers are scattered at the anti-Stokes sidebands. Remarkably, the degree of entanglement for both the mirror pair and the field pair can be controlled by an external field driving the gain medium. Our scheme is able to entangle two macroscopic objects with current state-of-the-art experimental apparatus. 2013 American Physical Society.