AI Article Synopsis
- Researchers demonstrate quantum channels that, with classical feedback, have higher capacities than their unassisted classical Holevo capacity.
- The design of these channels incorporates noise that can be mitigated using output and an entangled reference system.
- A related approach shows that channels can achieve higher classical capacities through two-way communication compared to just feedback, leading to a series of capacity inequalities and unresolved questions.
Article Abstract
We exhibit quantum channels whose classical and quantum capacities, when assisted by classical feedback, exceed their unassisted classical Holevo capacity. These channels are designed to be noisy in a way that can be corrected with the help of the output and a reference system entangled with part of the input. A similar construction yields quantum channels whose classical capacity, when assisted by two-way classical communication independent of the source, exceeds their classical capacity assisted by feedback alone. We give a hierarchy of capacity inequalities and open questions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.96.150502 | DOI Listing |
Publication Analysis
Top Keywords
quantum channels
12
channels classical
8
classical capacity
8
capacity assisted
8
classical
6
inequalities separations
4
assisted
4
separations assisted
4
assisted capacities
4
quantum
4
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!