Fundamental limits of repeaterless quantum communications
University of York · University College London
Abstract
Quantum communications promises reliable transmission of quantum information, efficient distribution of entanglement and generation of completely secure keys. For all these tasks, we need to determine the optimal point-to-point rates that are achievable by two remote parties at the ends of a quantum channel, without restrictions on their local operations and classical communication, which can be unlimited and two-way. These two-way assisted capacities represent the ultimate rates that are reachable without quantum repeaters. Here, by constructing an upper bound based on the relative entropy of entanglement and devising a dimension-independent technique dubbed 'teleportation stretching', we establish these…
Citation impact
- FWCI
- 89.07
- Percentile
- 100%
- References
- 105
Authors
4Topics & keywords
- Quantum key distribution
- Quantum channel
- Computer science
- Quantum capacity
- Quantum entanglement
- Quantum information science
- Point-to-point
- Quantum network