Abstract
We propose a quantum cloning machine, which clones a qubit into two clones assuming known modulus of expectation value of Pauli σz matrix. The process is referred to as the mirror phase-covariant cloning for which the input state is a priori less known than that for the standard phase-covariant cloning. Analytical expressions describing the cloning transformation and fidelity of the clones are found. Extremal equations for the optimal cloning are derived and analytically solved by generalizing a method of Fiurášek [Phys. Rev. A 64, 062310 (2001)]. Quantum circuits implementing the optimal cloning transformation and their physical realization in a quantum-dot system are described.
| Original language | English (US) |
|---|---|
| Article number | 032306 |
| Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
| Volume | 80 |
| Issue number | 3 |
| DOIs | |
| State | Published - Sep 3 2009 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics