Decoherence is well understood, in contrast with disentanglement. According to common lore, irreversible coupling to a dissipative environment is the mechanism for loss of entanglement. Here, we show that, on the contrary, disentanglement can in fact occur at large enough temperatures T even for vanishingly small dissipation (as we have shown previously for decoherence). However, whereas the effect of T on decoherence increases exponentially with time, the effect of T on disentanglement is constant for all times, reflecting a fundamental difference between the two phenomena. Also, the possibility of disentanglement at a particular T increases with decreasing initial entanglement. © 2010 The Royal Swedish Academy of Sciences.
Publication Source (Journal or Book title)
Ford, G., & O'Connell, R. (2010). Disentanglement and decoherence without dissipation at non-zero temperatures. Physica Scripta, 82 (3) https://doi.org/10.1088/0031-8949/82/03/038112