Distillation of Continuous-Variable Entanglement

Jens Eisert, Dan E. Browne, Martin Bodo Plenio +1 more

J. Eisert, Dan E. Browne, S. Scheel +1 more

Austin P. Lund, Timothy C. Ralph

Any continuous-variable distillation protocol that does not change the effective loss of the transmission channel cannot be used to achieve maximum Einstein-Podolsky-Rosen style correlations after distillation. We analyze the continuous-variable entanglement distillation protocol described by [Browne et al., Phys. Rev. A 67, 062320 (2003)] and show that it does not change the effective loss of the transmission of entanglement. We extend this scheme to one which does change the effective transmission coefficient of the channel. Our scheme has the added benefit that the states generated exhibit isotropic noise which is best suited to applications of continuous-variable entanglement such as continuous-variable teleportation.

Mikael Lassen, Ruifang Dong, J. Heersink +5 more

We experimentally demonstrate distillation of continuous variable entangled light that has undergone non‐Gaussian attenuation loss. The continuous variable entanglement is generated with optical fibers and sent through a lossy channel, where the transmission is varying in time. By employing simple linear optical components, a measurement induced operation and classical communication, we demonstrate that the entanglement is probabilistically increased.

Tamoghna Das, Asutosh Kumar, Amit Kumar Pal +3 more

Rumeng Dong, Mikael Lassen, Christoph Marquardt +3 more

We experimentally demonstrate distillation of continuous variable entanglement through an attenuating quantum channel. Through a simple protocol based entirely on linear optics and homodyne detection we probabilistically filter out a highly entangled state from a less non-entangled mixed state. (C) 2008 Optical Society of America