Geometric discord: A resource for increments of quantum key distribution through twirling
arXiv:1501.04902 · doi:10.1038/srep13365
Abstract
In the present work, we consider a scenario where an arbitrary two-qubit pure state is applied to generate a randomly distributed key via the generalized EPR protocol. Using the twirling procedure to convert the pure state into a Werner state, the error rate of the key can be reduced by a factor of . This effect indicates that entanglement is not the sufficient resource of the generalized EPR protocol since it is not increased in the twirling procedure. Instead of entanglement, the geometric discord is suggested to be the general quantum resource for this task.
4 pages, no figure, comments are welcome
References in corpus (14)
- Quantum discord and the power of one qubit
- Necessary and sufficient condition for non-zero quantum discord
- Interpreting quantum discord through quantum state merging
- Operational interpretations of quantum discord
- Quantum discord for general two--qubit states: Analytical progress
- Linking Quantum Discord to Entanglement in a Measurement
- All non-classical correlations can be activated into distillable entanglement
- Quantum discord as a resource for quantum cryptography
- Quantum discord for two-qubit X states: Analytical formula with very small worst-case error
- Optimality of Gaussian Discord
- Discording power of quantum evolutions
- Verification of quantum discord
- Enhancement of quantum correlations between two particles under decoherence in finite temperature environment
- Quantum discord for the general two-qubit case