Fidelity Balance in Quantum Operations
Abstract
I derive a tight bound between the quality of estimating the state of a single copy of a d-level system, and the degree the initial state has to be altered in the course of this procedure. This result provides a complete analytical description of the quantum mechanical trade-off between the information gain and the quantum state disturbance expressed in terms of mean fidelities. I also discuss consequences of this bound for quantum teleportation using nonmaximally entangled states.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 2001
- DOI:
- 10.1103/PhysRevLett.86.1366
- arXiv:
- arXiv:quant-ph/0003123
- Bibcode:
- 2001PhRvL..86.1366B
- Keywords:
-
- Quantum Physics
- E-Print:
- 4 pages, REVTeX. Revised version