Computing with a single qubit faster than the computation quantum speed limit
Abstract
The possibility to save and process information in fundamentally indistinguishable states is the quantum mechanical resource that is not encountered in classical computing. I demonstrate that, if energy constraints are imposed, this resource can be used to accelerate informationprocessing without relying on entanglement or any other type of quantum correlations. In fact, there are computational problems that can be solved much faster, in comparison to currently used classical schemes, by saving intermediate information in nonorthogonal states of just a single qubit. There are also error correction strategies that protect such computations.
 Publication:

Physics Letters A
 Pub Date:
 February 2018
 DOI:
 10.1016/j.physleta.2017.12.042
 arXiv:
 arXiv:1701.05550
 Bibcode:
 2018PhLA..382..477S
 Keywords:

 Quantum speed limit;
 Quantum resource;
 Quantum gate fidelity;
 Quantum computing;
 Quantum Physics;
 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 5 pages, 2 figures