Mixedness and teleportation
Abstract
We show that on exceeding a certain degree of mixedness (as quantified by the von Neumann entropy), entangled states become useless for teleportation. By increasing the dimension of the entangled systems, this entropy threshold can be made arbitrarily close to maximal. This entropy is found to exceed the entropy threshold sufficient to ensure the failure of dense coding.
- Publication:
-
Physical Review A
- Pub Date:
- April 2000
- DOI:
- 10.1103/PhysRevA.61.040101
- arXiv:
- arXiv:quant-ph/9912033
- Bibcode:
- 2000PhRvA..61d0101B
- Keywords:
-
- 03.67.Hk;
- Quantum communication;
- Quantum Physics
- E-Print:
- 6 pages, no figures