Deterministic quantum entanglement between macroscopic ferrite samples
Jayakrishnan M. P. Nair, G. S. Agarwal
Abstract
We show how macroscopic magnetic samples like yttrium iron garnet samples are excellent candidates for producing deterministic quantum entanglement and, thus, providing a platform for quantum information science. This requires strong coupling with a high quality cavity, which, in turn, provides an effective coupling between the two samples. For modest values of the squeezing of the pump, we obtain significant entanglement between the two garnet samples. This is the principal feature of our scheme. We present a number of tests for entanglement in terms of the experimentally observed quantities and, in this way, unfold a paradigm for producing entanglement. We also generate quantum states of collective magnon variables.