Physics – Quantum Physics
Scientific paper
2005-10-10
Phys. Rev. A 73, 052304 (2006)
Physics
Quantum Physics
5 pages, 4 figures, Revtex4. v2: Minor changes, Corrected typos and Added references
Scientific paper
10.1103/PhysRevA.73.052304
We analyze the performance of holonomic quantum gates in semi-conductor quantum dots, driven by ultrafast lasers, under the effect of a dissipative environment. In agreement with the standard practice, the environment is modeled as a thermal bath of oscillators linearly coupled with the excitonic states of the quantum dot. Standard techniques of quantum dissipation make the problem amenable to a numerical treatment and allow to determine the fidelity (the common gate-performance estimator), as a function of all the relevant physical parameters. As a consequence of our analysis, we show that, by varying in a suitable way the controllable parameters, the disturbance of the environment can be (approximately) suppressed, and the performance of the gate optimized--provided that the thermal bath is purely superhomic. We conclude by showing that such an optimization it is impossible for ohmic environments.
Parodi Daniele
Sassetti Maura
Solinas Paolo
Zanardi Paolo
Zanghi Nino
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